JP2011047033A - Ceramic for ornamental parts and ornamental parts using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceramic for ornamental parts, which has a golden color tone, can provide a quality appearance, a feeling of aesthetic satisfaction and a spiritual ease, and also can provide the gloss of the decorative surface without enlarging the dimension extraordinarily, and to provide the ornamental parts using the same. <P>SOLUTION: The ceramic for the ornament parts is made from a sintered body of a titanium nitride base, which includes nickel, niobium, chromium and carbon, and does not substantially include the oxide of niobium in the inner part. Because of not including the oxide of niobium substantially in the inner part, the sintered body can provide a preferable golden color, reduces cubical expansion which is produced by the oxidation of niobium, becomes difficult to lower the density, accordingly shows the gloss of the decorative surface, and seldom deviates from the range of the standard dimension. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ceramic for decorative parts and a decorative part using the same.

  2. Description of the Related Art Conventionally, gold decorative parts for watches and accessories for jewelry, which are gold, alloys thereof, or various metals plated from the viewpoint of color tone and corrosion resistance, have been used.

For example, in Patent Document 1, as a hard phase, titanium nitride is 45 to 75% by weight and titanium carbide is 7.5%.
-25% by weight, chromium as the binder phase in the total amount of carbide in the amount of 1-10% by weight, molybdenum in the total amount of carbide in the amount of 0.1-5% by weight, and nickel in the total amount of 5-20% by weight And
Sintered alloys with L * a * b * color system color index L * = 65-69, a * = 4-9, b * = 5-16 obtained with a colorimeter (ceramics for decorative parts) ) Is disclosed.

Moreover, in patent document 2, the hard phase represented by following Formula (A) is 70 to 98 weight%,
(Tia, Mb) (Nw, Cx, Oy) Z (A)
However, one or more of M: Zr, Hf, V, Nb, Ta, Cr a + b = 1, 1 ≧ a ≧ 0.4, 0.6 ≧ b ≧ 0
W + X + Y = 1, X + Y> 0, 1> W ≧ 0.4
0.19 ≧ X ≧ 0, 0.6 ≧ Y ≧ 0, 0.93 ≧ Z ≧ 0.6
A decorative sintered alloy (ceramics for decorative parts) is disclosed in which one or more binder phases selected from Fe, Ni, Co, Cr, Mo, and W are composed of 2 to 30% by weight and inevitable impurities. Yes.

Further, in Patent Document 3, one or more binder phases selected from Fe, Ni, Co, Cr, Mo, and W are 2 to 30% by weight and P, Al, B, Si, Mn, Ti, and Zr. , Hf, V, Nb, Ta, one or more metals, alloys, oxides of Al, Y, Zr, Mg, Ni, Si, nitrides of Al, Si, B, carbides of Mo, or their mutual solid solution Disclosed is a decorative sintered alloy (ceramic for decorative parts) composed of 0.1 to 10% by weight of a reinforcing phase composed of one or more compounds, and the remainder being a hard phase represented by the following formula (A) and inevitable impurities: .

(Tia, Mb) (Nw, Cx, Oy) Z (A)
However, one or more selected from M: Zr, Hf, V, Nb, Ta, Cr a + b = 1, 1 ≧ a ≧ 0.4, 0.6 ≧ b ≧ 0
W + X + Y = 1, X + Y> 0, 1> W ≧ 0.4
0.5 ≧ X ≧ 0, 0.6 ≧ Y ≧ 0.06, 0.93 ≧ Z ≧ 0.6
Patent Documents 2 and 3 disclose decorative sintered alloys (ceramics for decorative parts) that retain a golden color tone by a hard phase mainly composed of TiN _Z (0.6 ≦ Z ≦ 0.95). .

  In Patent Document 4, titanium nitride is the main component, nickel is a minor component, and at least one of vanadium nitride, niobium nitride, tantalum nitride, molybdenum carbide, niobium carbide, tungsten carbide, and tantalum carbide, Is a ceramic for decorative parts containing at least an arithmetic average height Ra of the decorative surface of 0.03 μm or less, and a lightness index L * in the CIE1976 L * a * b * color space of the decorative surface of 72 to 84, and ceramics for decorative parts having chromaticness indices a * and b * of 4 to 9, and 28 to 36, respectively, are disclosed.

Japanese Patent Laid-Open No. 2003-13154 JP 58-204149 A JP-A-58-204150 European Patent Application No. 1767661

  However, the sintered alloy (ceramics for decorative parts) described in Patent Document 1 has a color tone that has both a silver color and a purple color from a color tone that has both a silver color and a purple color, and is not a golden color tone.

  In addition, the decorative sintered alloys (ceramics for decorative parts) described in Patent Documents 2 and 3 affect the mechanical characteristics such as hardness and toughness and the color difference, which is the difference in color tone generated between decorative parts. Since the ratio of carbon can take a wide range of values, there are problems that decorative parts with low mechanical properties appear or cases where the color difference between the decorative parts is large.

  In the ceramic for decorative parts described in Patent Document 4, the carbon ratio is not controlled, and there is a possibility that a decorative part having low mechanical properties may appear or a color difference between the decorative parts may increase.

  Furthermore, in the ceramics for decorative parts described in Patent Documents 2 and 3, oxidation cannot be suppressed in the degreasing process, and volume expansion may occur due to this oxidation. And when this volume expansion generate | occur | produced, while the density of ceramics fell, while the glossiness of the decoration surface fell, the subject that it remove | deviated to the larger one from the range of a standard dimension occurred.

  The present invention has been devised to solve the above-mentioned problems, has a golden color tone, provides high-quality feeling, aesthetic satisfaction and mental comfort, and gives a decorative surface gloss, dimensions. It is an object of the present invention to provide a ceramic for decorative parts that does not become abnormally large and easily fits in a desired standard dimension, and a decorative part using the same.

  The ceramic for decorative parts of the present invention comprises a titanium nitride sintered body containing nickel, niobium, chromium and carbon, and is characterized by substantially not containing the niobium oxide inside.

  Moreover, the ceramic for decorative parts of the present invention is characterized in that, in the above configuration, the carbon content in the decorative surface is 0.4 mass% or more and 0.9 mass% or less.

  In the ceramic for decorative parts of the present invention, the arithmetic average height Ra of the decorative surface is 0.03 μm or less and the brightness index L in the CIE1976L * a * b * color space of the decorative surface is any one of the above-described configurations. * Is 72 to 84, and chromaticness indices a * and b * are 3 to 9 and 27 to 36, respectively.

  Further, in the ceramic for decorative parts of the present invention, in any one of the above structures, the titanium nitride sintered body includes an intermetallic compound including the nickel and the niobium or titanium in the decorative surface. It is what.

Moreover, the ceramic for decorative parts according to the present invention is characterized in that, in any one of the above-described structures, the titanium nitride sintered body is 0.8 ≦ x ≦ 0.96 when the composition formula is TiN _x. is there.

In addition, the ceramic for decorative parts of the present invention is characterized in that, in any of the above-described configurations, the nickel is contained in a content of 7% by mass to 14.5% by mass and the niobium is contained in a content of 2.5% by mass to 10% by mass. To do.

  Moreover, the ceramic for decorative parts of the present invention is characterized in that, in any of the above-described configurations, the chromium is contained in a content of 1.5 mass% or more and 6.5 mass% or less.

  Moreover, the ceramic for decorative parts of the present invention is characterized in that, in any one of the above-described structures, the titanium nitride sintered body contains an intermetallic compound composed of the chromium and the nickel.

  In addition, the ceramic for decorative parts of the present invention is characterized in that, in any of the above-described structures, the titanium nitride sintered body has an average crystal grain size of 1 μm or more and 10 μm or less.

  Further, the composite decorative part of the present invention is characterized in that the decorative part ceramics of the present invention having any one of the above structures and a decorative part having a decorative surface of a color different from that of the decorative part ceramics are arranged side by side. It is what.

  Moreover, the decorative part for timepieces of the present invention is characterized by comprising the ceramics for decorative parts of the present invention having any one of the above-described configurations.

  The decorative part for a portable terminal of the present invention is characterized by comprising the ceramic for decorative parts of the present invention having any one of the above-described configurations.

  Moreover, the decorative part for daily goods of the present invention is characterized by comprising the ceramic for decorative parts of the present invention having any one of the above-described configurations.

  Moreover, the decorative part for vehicle articles of the present invention is characterized by comprising the ceramic for decorative parts of the present invention having any one of the above-described configurations.

  Moreover, the decorative part for sports goods of the present invention is characterized by comprising the ceramic for decorative parts of the present invention having any one of the above-described configurations.

  Moreover, the decorative component for musical instrument of the present invention is characterized by comprising the ceramic for decorative component of the present invention having any one of the above configurations.

  Moreover, the decorative component for accessory of the present invention is characterized by comprising the ceramic for decorative component of the present invention having any one of the above-described configurations.

  Moreover, the decorative component for building material of the present invention is characterized by comprising the ceramic for decorative component of the present invention having any one of the above-described configurations.

According to the ceramics for decorative parts of the present invention, a preferable golden color is provided because it is composed of a titanium nitride sintered body containing nickel, niobium, chromium and carbon and does not substantially contain an oxide of niobium inside. In addition to being able to suppress volume expansion caused by oxidation of niobium and making it difficult for the density to decrease, the gloss of the decorative surface can be obtained, and the dimensions are hardly out of the range of the standard dimensions of the product And can.

Further, according to the ceramic for decorative parts of the present invention, the carbon content in the decorative surface is 0.4.
When the content is not less than 0.9% by mass, carbon diffuses into titanium nitride to form a solid solution and promotes sintering. Therefore, mechanical properties such as hardness and toughness can be enhanced, and carbon is exhibited. Due to the black color, there is a slight tendency to achromatic color and color unevenness seems to be suppressed, and the color difference (ΔE * ab), which is the difference in color tone, can be reduced. There is almost no difference in color tone.

  In addition, according to the ceramic for decorative parts of the present invention, the arithmetic average height Ra of the decorative surface is 0.03 μm or less, and the lightness index L * in the CIE1976L * a * b * color space of the surface is 72 or more and 84 or less. Yes, when the chromaticness index a *, b * is 3 or more and 9 or less and 27 or more and 36 or less, respectively, the light reflectance on the decorative surface is high, so that the gloss is increased, and a high-class feeling and aesthetic satisfaction can be obtained. it can.

  Further, according to the ceramic for decorative parts of the present invention, when the intermetallic compound composed of nickel and niobium or titanium is included in the decorative surface, the value of the brightness index L * on the decorative surface becomes large, so that the brightness drifts elegantly. Can be obtained.

Further, according to the ceramic for decorative parts of the present invention, when the titanium nitride sintered body is 0.8 ≦ x ≦ 0.96 when the composition formula is TiN _x , the glossy color tone is further increased. A higher luxury and aesthetic satisfaction can be obtained.

Further, according to the ceramic for decorative parts of the present invention, when the nickel is contained in a content of 7% by mass or more and 14.5% by mass or less and the niobium is contained in a content of 2.5% by mass or more and 10% by mass or less, the titanium nitride crystal is strengthened. Can be combined. In addition, when wearing ceramics for decorative parts, nickel does not easily elute by reacting with sweat. In addition, 2.5% by mass of niobium
Since it is contained at a content of 10% by mass or less, niobium works to suppress grain growth of titanium nitride when it dissolves in the titanium nitride crystal or melts at the crystal grain boundary. The crystal grain boundary expands and has specular reflection by the crystal that forms the decorative surface with respect to incident light and diffuse reflection by the crystal grain boundary, and can increase the brightness index L * on the decorative surface, and the color tone is excellent As a result, the glossy color tone is increased, and there is a sense of luxury, and aesthetic satisfaction can be obtained.

  In addition, according to the ceramic for decorative parts of the present invention, when chromium is contained in an amount of 1.5% by mass or more and 6.5% by mass or less, the corrosion resistance is improved, so that high-quality feeling, aesthetic satisfaction and mental comfort are maintained for a long time. can do.

  In addition, according to the ceramic for decorative parts of the present invention, when the titanium nitride sintered body contains an intermetallic compound consisting of chromium and nickel, the ceramic for decorative parts is used as a watch decoration. Even when used for parts and decorative parts for portable terminals, it can be made less susceptible to magnetic effects.

  Further, according to the ceramic for decorative parts of the present invention, the titanium nitride sintered body can reduce coarse crystal grains when the average crystal grain size is 1 μm or more and 10 μm or less. On the other hand, since the area of the crystal grain boundary on the decorative surface is suppressed, higher luxury and aesthetic satisfaction can be obtained.

  Further, according to the composite decorative part of the present invention, since the decorative part ceramics of the present invention and the decorative part having a decorative surface of a different color tone are arranged side by side, for example, if the different color tone is purple, The combination with the golden color of the ceramics for decorative parts of the invention can stimulate consumers' willingness to purchase when used in store advertisements and interior goods that require decoration. In addition, when the different color tone is black, the combination with the golden color of the color tone exhibited by the ceramic for decorative parts of the present invention increases the visibility and is required to be viewed from a distance, for example, a display component such as a guide plate Can be suitably used. Furthermore, if the different color tone is silver, it is possible to enhance the decorativeness that is more luxurious.

  Further, according to the decorative part for a watch of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as high-class feeling and aesthetic satisfaction. It can be suitably used for a watch that also requires aesthetic appearance.

  Further, according to the decorative part for a portable terminal of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as a high-class feeling and an aesthetic satisfaction. Therefore, it can be suitably used for a portable terminal device in which performance is important.

  Further, according to the decorative part for daily goods of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for daily necessities that require a beautiful aesthetic appearance.

  In addition, according to the decorative part for vehicle articles of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for vehicle articles that require a beautiful aesthetic appearance.

  In addition, according to the decorative part for sporting goods of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for sports equipment that requires a beautiful aesthetic appearance.

  Moreover, according to the decorative part for musical instruments of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for musical instruments that also require aesthetic appearance.

  In addition, according to the decorative part for jewelry of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for jewelry that also requires aesthetic appearance.

  In addition, according to the decorative part for building materials of the present invention, since it is made of the ceramic for decorative parts of the present invention, it is possible to obtain a mental comfort through vision such as luxury and aesthetic satisfaction. It can be suitably used for building materials that also require aesthetic appearance.

(A)-(f) is the schematic diagram which looked at the decorative surface planarly, and shows an example of the composite decorative component of this embodiment, respectively. An example of a watch case which is a decorative part for watch of the present embodiment is shown, (a) is a perspective view of the watch case seen from the front side, and (b) is a watch case of (a) seen from the back side. It is a perspective view. It is a perspective view which shows the other example of the case for timepieces which is the decorative component for timepieces of this embodiment. It is a bottom view which shows an example of the back cover for timepieces which is the decorative component for timepieces of this embodiment. It is a schematic diagram which shows an example of a structure of the timepiece band which is the decorative component for timepieces of this embodiment. It is a perspective view which shows an example of the mobile telephone using the decoration component for portable terminals of this embodiment. It is a perspective view which shows the state which opened the housing | casing of the mobile phone of the example shown in FIG. It is a perspective view which shows an example of the notebook type personal computer which is another example using the decoration component for portable terminals of this embodiment. It is a schematic diagram which shows an example of a structure of the soap case which is a decorative part for household goods of this embodiment. It is a perspective view which shows an example of the coffee cup set which is another example of the decorative component for household goods of this embodiment. It is a perspective view which shows an example of the vehicle body which attached the decorative component for vehicle articles of this embodiment. It is a front view which shows an example of the corner pole using the decorative component for vehicle articles of this embodiment. It is a front view which shows an example of the golf club using the decorative component for sports goods of this embodiment. It is a bottom view which shows an example of the spike shoes using the decorative component for sporting goods of this embodiment. It is a perspective view which shows an example of the guitar using the decorative component for musical instruments of this embodiment. It is a schematic diagram which shows an example of the artificial dental crown using the decorative component for accessory of this embodiment. It is a front view which shows an example of the earphone unit using the decorative component for accessory of this embodiment. It is a perspective view which shows an example of spectacles using the decorative component for accessory of this embodiment. It is a perspective view which shows an example of the grip for door handles using the decorative component for building materials of this embodiment.

  Hereinafter, embodiments of the ceramic for decorative parts of the present invention will be described.

  The ceramic for decorative parts of the present embodiment is made of a titanium nitride sintered body containing nickel, niobium, chromium and carbon.

In this embodiment, the titanium nitride-based sintered body is a sintered body containing titanium nitride (TiN) as a main component, and the main component here is 100% by mass of all components constituting the ceramic for decorative parts. Is a component occupying 50% by mass or more. This main component, titanium nitride, exhibits a good golden color as a decorative product and has high mechanical properties such as strength and hardness. Therefore, the titanium nitride sintered body of the present embodiment In the ceramic for decorative parts, it is preferable to contain titanium nitride in a content of 70% by mass or more.

Nickel is rich in malleability and acts as a binder that binds titanium nitride crystals as the main component, and niobium acts as a color tone adjusting agent. In addition to metallic niobium, the composition formula is, for example, NbNi. ₃ , including those present as niobium compounds represented by NbC. Chromium tends to combine with oxygen in the air to form a dense oxide film on the decorative surface to improve corrosion resistance, and carbon tends to improve mechanical properties such as toughness and hardness.

  And it is important that the ceramic for decorative parts of this embodiment consists of a titanium nitride sintered body containing nickel, niobium, chromium and carbon, and does not substantially contain an oxide of niobium inside. Since the titanium nitride sintered body having the above structure does not substantially contain niobium oxide, volume expansion caused by niobium oxidation by applying heat and pressure in the degreasing process is suppressed. Since the density is hardly lowered, the gloss of the decorative surface can be obtained, and it can be hardly deviated from the standard dimension range.

In addition, in the ceramic for decorative parts excluding the area within 0.1 mm from the surface of the ceramic for decorative parts, the niobium oxide is 0.5% by mass or less. Niobium oxide is niobium monoxide, niobium dioxide, niobium trioxide, niobium pentoxide, etc. whose composition formulas are represented by NbO, NbO ₂ , Nb ₂ O ₃ , and Nb ₂ O ₅ , respectively. . Such a niobium oxide can be detected by an X-ray diffraction method, and when it is not detected, it can be considered that the niobium oxide is 0.5 mass% or less.

In the ceramic for decorative parts of the present embodiment, the carbon content on the decorative surface is preferably 0.4% by mass or more and 0.9% by mass or less. By containing carbon in this amount on the decorative surface, carbon diffuses into titanium nitride to form a solid solution and promotes sintering, so that mechanical properties such as toughness and hardness can be enhanced. Carbon also affects the chromaticness index a * and the color difference (ΔE * ab), which is the difference in color tone defined by the following formula (A). By including carbon at this content, the black color of carbon presents a slight tendency to achromatic color and suppresses uneven color, so that the preferred golden color hardly feels the color difference that occurs between decorative parts. can do.

ΔE * ab = ((ΔL *) ² + (Δa *) ² + (Δb *) ² )) ^1/2 (A)
In addition, what is necessary is just to measure about carbon content using a carbon analysis method.

  In order to make a ceramic for decorative parts with a golden color that gives a demand for decorative value such as luxury, aesthetic satisfaction, and mental comfort, the arithmetic average height Ra of the decorative surface is 0.03 μm or less. In addition, the lightness index L * in the CIE1976L * a * b * color space of the decorative surface is 72 or more and 84 or less, and the chromaticness indices a * and b * are 3 or more and 9 or less, and 27 or more and 36 or less, respectively. preferable.

  Here, the lightness index L * is an index indicating the lightness and darkness of the color tone. When the value of the lightness index L * is large, the color tone is bright, and when the value of the lightness index L * is small, the color tone is dark. The chromaticness index a * is an index indicating the degree of red to green color tone. When the value of a * increases in the positive direction, the color tone becomes red. As the absolute value decreases, the color tone becomes less vivid. The color tone becomes dull, and if the value of a * is large in the negative direction, the color tone becomes green. Further, the chromaticness index b * is an index indicating the degree of yellow to blue of the color tone. When the value of b * increases in the positive direction, the color tone becomes yellow, and as the absolute value decreases, the color tone becomes less vivid. The color tone becomes dull when the b * value is large in the negative direction.

  In addition, since the arithmetic average height Ra of the decorative surface affects the reflectance of light and changes the color tone, the arithmetic average height Ra of the decorative surface is preferably set to 0.03 μm or less. Thereby, the reflectance of light becomes high and the value of the brightness index L * can be increased. When the arithmetic average height Ra exceeds 0.03 μm, the value of the lightness index L * is lowered, the color tone becomes dark, and there is a possibility that the high-class feeling is lowered.

The wavelength of this light is a set of visible rays having a wavelength of 380 to 780 nm. By setting the arithmetic average height Ra to 0.03 μm or less, the visible rays are dispersed to reflect light in a wavelength range of 450 to 500 nm indicating blue. Since it acts to increase the reflection of light in the wavelength range of 570 to 590 nm indicating yellow, it can exhibit a golden color that gives a high-class feeling, aesthetic satisfaction, mental comfort, and the like. In particular, the reflectance of the decorative surface with respect to light in the wavelength range of 570 to 700 nm is preferably 50% or more.

The arithmetic average height Ra may be measured according to JIS B 0601-2001, and the measurement length and cut-off value are 5 mm and 0.8 mm, respectively, and are measured using a stylus type surface roughness meter. In this case, for example, a stylus having a radius of 2 μm is applied to the decorative surface of the ceramic for decorative parts, and the scanning speed of the stylus is set to 0.5 mm / second. Is the arithmetic average height Ra.

  The reason why the value of the brightness index L * is set to 72 or more and 84 or less is that a moderate brightness appears in the golden tone, and the value of the chromaticness index a * is set to 3 or more and 9 or less. This is because redness can be suppressed without reducing the vividness of the color tone. The reason why the value of the chromaticness index b * is 27 or more and 36 or less is that a golden color can be produced without reducing the vividness of the color tone. In particular, the value of the brightness index L * is preferably 72 or more and 79 or less.

The ceramic for decorative parts of the present invention preferably has an open porosity of 2.5% or less on the decorative surface. The open porosity on the decorative surface particularly affects the value of the lightness index L *. When the open porosity is high, the value of the lightness index L * is small, and when the open porosity is low, the value of the lightness index L * is large. Become. By setting the open porosity on the decorative surface to 2.5% or less, the value of the brightness index L * is 77
This can be done as described above, resulting in a more preferred color tone. Furthermore, the value of the brightness index L * is preferably 78 or more, and in this case, the open porosity is preferably 1.1% or less.

Note that the open porosity on the decorative surface is obtained by using a metallurgical microscope to capture an image of the decorative surface with a CCD camera at a magnification of 200 times, and using an image analyzer (such as LUZEX-FS manufactured by Nireco Corp.) Obtain the area of open pores when the measurement area of one field of view is 2.25 × 10 ⁻² mm ² and the number of fields of view is 20, that is, the total measurement area is 4.5 × 10 ⁻¹ mm ² . What is necessary is just to set it as a porosity.

  In addition, the decorative surface in the ceramic for decorative parts of the present embodiment refers to a surface where the decorative value of the decorative component is required, and does not indicate all surfaces. For example, when the ceramic for decorative parts of the present embodiment is used for a watch case, the outer surface of the watch case is a decorative surface because it is an object of appreciation and requires a decorative value.

  The value of the brightness index L * and the value of the chromaticness index a *, b * in the CIE1976 L * a * b * color space of such a decorative surface is obtained by measuring in accordance with JIS Z 8722-2000. It is done. For example, a spectrocolorimeter (such as CM-3700d manufactured by Konica Minolta Holdings Co., Ltd.) can be used, and the light source can be measured with a CIE standard light source D65, the viewing angle set to 10 °, and the measurement range set to 5 mm × 7 mm. .

Moreover, it is preferable that the ceramic for decorative parts of this embodiment contains the intermetallic compound which consists of nickel and niobium or titanium in a decorative surface. Since these intermetallic compounds are included in the decorative surface, the value of the brightness index L * on the decorative surface is increased, thereby bringing out a dignified brightness. Such an intermetallic compound is, for example, a component whose composition formula is shown as TiNi ₃ , Ti ₂ Ni, or NbNi ₃ , and can be identified by an X-ray diffraction method.

Further, in the ceramic for decorative parts of the present embodiment, it is preferable that 0.8 ≦ x ≦ 0.96 when the composition formula of the titanium nitride sintered body is TiN _x . The composition formula is TiN _x as described later.
The color tone is affected by the value of the number of atoms x. When the number of atoms x decreases, the color tone changes from golden to light golden, and when the number of atoms x increases, the color tone becomes dull and deep golden. From this point of view, the value of the number of atoms x when the composition formula is TiN _x is 0.8 or more and 0.96.
When the value of the number of atoms x is in this range, the glossy color tone is further increased, so that a higher quality and aesthetic satisfaction can be obtained.

Atoms when titanium nitride, since that may become oxygen and carbon substituted or react with the acid titanium carbonitride included in the degreasing or firing atmosphere (TiCNO), the composition formula of the titanium nitride-based sintered body was TiN _x The value of the number x can be obtained as follows using an oxygen / nitrogen analyzer and a carbon analyzer. Specifically, after measuring the oxygen, nitrogen and carbon contents of the titanium nitride sintered body with these analyzers, the value obtained by subtracting the oxygen, nitrogen and carbon contents from 100% by mass is the titanium content. And Then, since the number of moles is obtained by dividing the titanium content and the nitrogen content by the respective atomic weights, the value of the ratio of nitrogen when the mole number of titanium is 1 is defined as the number of atoms x.

  The ceramic for decorative parts of this embodiment preferably contains nickel in a content of 7% by mass to 14.5% by mass and niobium in a content of 2.5% by mass to 10% by mass.

  Nickel is highly malleable and acts as a binder that bonds together the titanium nitride crystals, which are the main components. Therefore, it is preferable to add as much as possible. On the other hand, if the ratio in ceramics for decorative parts is too high When wearing ceramics for decorative parts, it reacts with sweat and nickel is eluted, and the color tone is reddish, and the decorativeness such as luxury, aesthetic satisfaction and mental comfort that consumers demand There is a risk that it will not be a golden color that gives value. In addition, although the chromaticness index a * in the CIE1976 L * a * b * color space is high, both the lightness index L * and the chromaticness index b * are low, so the nickel content is 7 mass% or more and 14.5 mass% or less. Preferably there is. In particular, when this ceramic for decorative parts is worn on a wristwatch case, a band piece or the like, the nickel content is more preferably 7% by mass or more and 10% by mass or less.

The niobium content is 2.5% by mass or more and 10% by mass or less because the niobium is dissolved in titanium nitride or melted inside nickel, thereby adjusting the color tone to increase the value of the lightness index L *. This is because, while having an effect as an agent, if the niobium content is large, the covalent bondability is high, so that sintering may be difficult.

  The niobium content is more preferably 3% by mass or more and 8% by mass or less. This is because niobium works to suppress grain growth, so the crystal grain boundary increases, and the incident light is strongly influenced by diffuse reflection by the crystal grain boundary in addition to the specular reflection by the crystal forming the decorative surface. The lightness index L * on the decorative surface increases, and the color tone produces an excellent synergistic effect. Therefore, the glossy color tone is increased, and a high-class feeling and aesthetic satisfaction can be obtained. As a result, mental comfort can be obtained through vision.

  The reflection generally includes specular reflection and diffuse reflection. In the present embodiment, the specular reflection refers to reflection after light is incident on a decorative surface that is a mirror surface, microscopically, a crystal that forms the decorative surface. The reflection angle is the same as the incident angle and the reflection angle. Diffuse reflection refers to reflection that goes to the outside again after light enters the crystal grain boundary and repeats random reflection.

However, the surface roughness of the crystal forming the decorative surface can be adjusted by barrel polishing, which will be described later, and the surface roughness of the crystal surface not including the grain boundary when measured with an atomic force microscope is calculated as the arithmetic average height Ra. When it is 0.001 to 0.002 μm, there is a tendency that the reflection on the crystal surface partially changes from the specular reflection to the diffuse reflection, and the chromaticness index b * on the decorative surface can be increased to 32 or more and the golden color is bright. Therefore, it is preferable.

Moreover, nickel is preferable that they are precipitated as nickel niobate, for example NbNi ₃ combines with niobium, by precipitation of NbNi _3, increases the value of the lightness index L *, lightness drifting dignity exude. Nickel niobium such as NbNi ₃ can be detected by an X-ray diffraction method.

  Moreover, it is preferable that the ceramic for decorative parts of this embodiment contains chromium in a content of 1.5% by mass or more and 6.5% by mass or less. Chromium combines with oxygen in the air to produce a dense oxide film on the decorative surface, thus improving corrosion resistance and forming a grain boundary phase that binds titanium nitride with nickel surrounded by chromium. Nickel reacts with chromium to form a nickel chromium compound, and nickel can be prevented from ionizing and flowing out. However, the chromium content affects the vividness of the color, so to prevent nickel from flowing out and to have both corrosion resistance and vividness, the chromium content must be 1.5 to 6.5% by mass. Is preferred.

  The state in which nickel surrounds chromium refers to a state in which chromium is surrounded by a grain boundary phase without being in contact with the titanium nitride crystal. This state is a decorative surface obtained with a scanning electron microscope. And an image of a decorative surface showing the distribution state of nickel and chromium detected by an energy dispersive (EDS) X-ray microanalyzer can be confirmed.

In the ceramic for decorative parts of the present embodiment, the titanium nitride sintered body preferably contains an intermetallic compound composed of chromium and nickel. Although chromium and nickel are magnetic materials, this intermetallic compound is a non-magnetic material. Therefore, even if this ceramic for decorative parts is used for decorative parts for watches and decorative parts for mobile terminals, etc. It becomes difficult to influence. Such an intermetallic compound is, for example, a component whose composition formula is shown as Cr ₂ Ni ₃ or Cr ₃ Ni ₂ , and can be identified by an X-ray diffraction method.

  The contents of titanium, nickel, niobium and chromium can be measured using a fluorescent X-ray analysis (XRF) method. Specifically, at least two kinds of mixed powders having different concentrations of each element of titanium nitride, nickel, niobium, and chromium are prepared in advance, and are each molded by a pressing method to obtain a standard sample. Next, each of these standard samples is irradiated with X-rays, and a calibration curve is created using the least square method from the relationship between the intensity of the fluorescent X-rays and the known concentration. And the ceramics for decorative parts of this embodiment are grind | pulverized to make a powder, and it shape | molds by the press method to make a measurement sample. This measurement sample is irradiated with X-rays, the intensity of fluorescent X-rays is measured, and the concentration content is obtained from the calibration curve. Nitrogen can be measured with an oxygen / nitrogen analyzer, and carbon can be measured with a carbon analyzer.

  In addition, the ceramic for decorative parts of this embodiment made of a titanium nitride sintered body preferably has a thermal conductivity of 22 W / (m · K) or more and 26 W / (m · K) or less. If the thermal conductivity is 22 W / (m · K) or higher, the heat dissipation characteristics will be excellent, and the heat generated from heat-generating electronic components such as insulated gate bipolar transistor (IGBT) elements will be quickly released to the outside. Therefore, it is preferable to use the ceramic for decorative parts of the present embodiment in a part of a portable terminal on which electronic parts are mounted.

Further, if the thermal conductivity is 26 W / (m · K) or less, condensation on the surface of the ceramic for decorative parts of this embodiment can be suppressed. When ceramics are used, the aesthetic satisfaction is hardly impaired because it is difficult for condensation to occur even in a cold winter morning. Furthermore, the thermal conductivity is 22 W / (m · K
) If it is in the range of 26 W / (m · K) or less, it is suitable because it can have both the heat dissipation characteristics and the thermal shock resistance, and the thermal expansion coefficient at 40 ° C. to 800 ° C. is 8.5 ×. It is more preferably 10 ⁻⁶ / ° C. or higher and 9.7 × 10 ⁻⁶ / ° C. or lower. This coefficient of thermal expansion is
It can be determined according to S R 1618-2002.

Moreover, it is preferable that the ceramic for decorative parts of this embodiment has a dynamic elastic modulus of 300 GPa or more. If the dynamic elastic modulus is 300 GPa or more, the ceramics for decorative parts can be made difficult to bend. Therefore, the ceramics for decorative parts of this embodiment are used for things such as wristwatch cases and band pieces. When there is, it is hardly deformed by contact or dropping. This dynamic elastic modulus can be determined in accordance with the ultrasonic pulse method specified in JIS R 1602-1995. When the thickness of the ceramic is thin and the thickness of the test piece cut out from the ceramic cannot be 10 mm as defined by the ultrasonic pulse method of JIS R 1602-1995, the thickness of the ceramic is evaluated as it is as the thickness of the test piece. Thus, it is preferable that the result satisfies the above numerical value. However, when the thickness of the ceramic is so thin that the above-described numerical value cannot be satisfied by evaluating the thickness as it is, the measurement may be performed using the free resonance natural vibration method.

Moreover, in the ceramic for decorative parts of the present embodiment, the average crystal grain size of the crystal is 1 μm or more and 10 μm or less from the viewpoint of obtaining the required strength as a ceramic for decorative parts and maintaining the gloss of the decorative surface. It is preferable that there is. When the average crystal grain size of the sintered body increases, the strength tends to decrease due to the increase in coarse crystal grains, and when the average crystal grain size of the sintered body decreases, the grain boundary increases, thereby affecting the influence of diffuse reflection. Since it becomes easy to receive strongly, the brightness index L * on the decorative surface tends to be high, and it is easy to feel the color difference between decorative parts, which is not preferable. From such a viewpoint, the average crystal grain size of the sintered body is preferably 1 μm or more and 10 μm or less. When the average crystal grain size is within this range, the required strength as a ceramic for decorative parts is obtained. At the same time, a higher level of luxury and aesthetic satisfaction can be obtained. In particular, when this ceramic for decorative parts is worn on wristwatch cases, band pieces, etc., it is necessary to sinter to increase the strength to prevent scratches due to contact or dropping. The average crystal grain size of the body is preferably 2.1 μm or more and 4.3 μm or less. The average crystal grain size is 86 to 110 μm × 65 to 92 μm, in which the fracture surface is magnified 1000 to 3000 times with a scanning electron microscope, and eight straight lines of the same length are drawn. The number of crystals present in is divided by the total length of these straight lines. When the magnification is 1000 times, the length per straight line is 80 μm, and when the magnification is 3000 times, the length per straight line is 27 μm.

  Fig.1 (a)-(f) is the schematic diagram which planarly viewed the decoration surface which shows an example of the composite decoration component of this embodiment, respectively.

  The composite decorative component 3 shown in FIGS. 1A to 1F is a decorative component ceramic 1 according to the present embodiment that exhibits a golden color when viewed in plan, and a decoration having a color tone different from that of the decorative component ceramic 1. It is an example of what is arrange | positioned side by side with the decorative component 2 which has a surface. As the shapes of the decorative part ceramics 1 and the decorative part 2, FIG. 1A is a triangular shape, FIG. 1B is a quadrangular shape, and FIG. 1C is a parallelogram shape. d) is a combination of a hexagonal shape and a triangular shape, (e) is a combination of an octagonal shape and a quadrangular shape, and (f) is a decorative component that surrounds the rectangular decorative component 2 and the decorative component 2. It is a combination with ceramics 1 for use.

  And, as a color tone different from the ceramics 1 for decorative parts, specifically, if the color tone of the decorative part 2 is purple, it stimulates consumers' willingness to purchase when used in store advertisements and interior goods that require decoration. can do.

  If the color tone of the decorative part 2 is black, the combination with the golden color of the color tone exhibited by the ceramic for decorative parts 1 of the present embodiment increases the visibility, and is required to be viewed from a distance, for example, guidance. It can be suitably used as a display component such as a plate. Furthermore, if the color tone of the decorative component 2 is silver, it is possible to enhance the decorativeness that is more luxurious.

  The decorative part 2 may be any material that has a different color tone from the decorative part ceramics 1 according to the present embodiment and enhances the decorativeness. Therefore, the material is not limited, and the shape of the decorative part ceramics 1 and the decorative part 2 Needless to say, the combinations are not limited to those shown in FIGS.

  The watch decorative part of this embodiment is made of the ceramic for decorative parts of this embodiment having the above-described configuration, and examples thereof include a watch case and a watch band piece.

  FIG. 2 shows an example of a watch case which is a watch decorative part of the present embodiment. FIG. 2A is a perspective view of the watch case as viewed from the front side, and FIG. 2B is a watch case of FIG. It is the perspective view which looked at the case from the back side. FIG. 3 is a perspective view showing another example of a watch case which is a watch decorative part of the present embodiment. FIG. 4 is a bottom view showing an example of a watch back cover, which is a watch decorative part of the present embodiment. FIG. 5 is a schematic diagram showing an example of the configuration of a watch band which is a watch decorative part of the present embodiment. In addition, when showing the same site | part in these figures, the same code | symbol is attached | subjected.

  A watch case 10A shown in FIGS. 2 (a) and 2 (b) has a recess 11 for housing a movement (drive mechanism) (not shown) and a foot for fixing a watch band (not shown) for mounting the watch on an arm. The concave portion 11 includes a thin bottom portion 13 and a thick trunk portion 14. The watch case 10B shown in FIG. 3 has a hole 15 for receiving a movement (drive mechanism) (not shown) and a watch band (not shown) for mounting the watch on an arm formed on the body 14. And a foot 12 to be provided.

  4 is attached to a plurality of mounting holes 18 provided on the peripheral side through screws (not shown), for example, from the back side of the watch case 10B shown in FIG. Yes.

  The band piece constituting the watch band 50 shown in FIG. 5 has a middle piece 20 having a through hole 21 into which the pin 40 is inserted, and a pin hole 31 into which both ends of the pin 40 are inserted. The pin 40 is inserted into the through hole 21 of the middle piece 20, and both ends of the inserted pin 40 are inserted into the pin holes 31 of the outer piece 30, thereby And the outer piece 30 are sequentially connected to form a watch band 50.

  The watch decorative parts of the present embodiment used as band pieces constituting the watch cases 10A and 10B, the watch back lid 17 and the watch band 50 are made of the decorative part ceramics of the present embodiment. Therefore, it is possible to sufficiently obtain a high-class feeling and aesthetic satisfaction as a watch and to obtain mental comfort through vision.

  The watch decorative part of the present embodiment includes a heart rate monitor and a pulse meter decorative part of the type attached to the wrist.

Moreover, in the ceramic for decorative parts of this embodiment, the Vickers hardness (Hv) of the decorative surface is one of the factors affecting the long-term reliability, and the Vickers hardness (Hv) is preferably 8 GPa or more. When the Vickers hardness (Hv) is in this range, the decorative surface is difficult to be damaged, so that the decorative surface is not easily damaged even when it comes into contact with a hard material such as dust made of glass or metal. Because. The Vickers hardness (Hv) of this decorative surface can be measured according to JIS R 1610-2003.

The fracture toughness affects the wear resistance of the decorative surface, and the higher the value, the better. The ceramic for decorative parts of this embodiment is preferably 4 MPa · m ^1/2 or more. This fracture toughness can be measured in accordance with the indenter press-in method (IF method) defined in JIS R 1607-1995.

When the ceramic for decorative parts is worn and used, the lighter one is preferred. Therefore, the apparent density of the ceramic for decorative parts of this embodiment is 6 g / cm ³ or less (0 g / cm ^3). The apparent density is measured in accordance with JIS R 1634-1998. If the ceramic for decorative parts is the middle piece 20 which is a part of the watch band piece, the tensile load is frequently applied to the middle piece 20. Therefore, in the ceramic for decorative parts of this embodiment, the tensile strength is 196 N (Newton ) Or more. In order to obtain this tensile strength, after inserting a cemented carbide pin (not shown) longer than the length of the through hole 21 into the through holes 21a and 21b of the middle piece 20, the pin is pulled in the direction of separating, The strength when 20 is broken can be read with a load cell. Further, when the ceramic for decorative parts is a watch case or a watch band piece, a ferromagnetic metal having a mass magnetization of 162 G · cm ³ / g or more, for example, cobalt, in consideration of an adverse effect on a movement (drive mechanism) (not shown). (Co
) Is preferably 0.1% by mass or less in total with respect to 100% by mass of the ceramic for decorative parts. Such a ratio of the ferromagnetic metal can be measured by ICP (Inductively Coupled Plasma) emission analysis.

  FIG. 6 is a perspective view showing an example of a mobile phone using the decorative component for a mobile terminal according to the present embodiment, and FIG. 7 is a perspective view showing a state in which the casing of the mobile phone in the example shown in FIG. 6 is opened. FIG.

  The decorative part for a mobile terminal according to the present embodiment is preferably made of the ceramic for decorative parts according to the present embodiment. Specific examples thereof include various operation keys of the mobile phone in the example shown in FIGS. There are cases or switches.

  The mobile phone 60 in the example shown in FIG. 6 includes a mode key 61a for changing the mode of the mobile phone 60 to a radio mode that is a mode for listening to radio, a music mode that is a mode for listening to music, and the like. The first casing 62 is provided with a manner key 61b for detecting a touch of a finger or the like, and a touch sensor 63 for inputting an input by the contact, a camera 64 for imaging a subject, a light 65, and a touch sensor. The second casing 67 is provided with a slide switch 66 for setting validity or invalidity of an input such as 63.

  7 shows a state where the second casing 67 is opened, and the first casing 62 and the second casing 67 are connected via a hinge 68. Thus, the second casing 67 can be freely opened and closed. The second casing 67 includes a front case 69a and a rear case 69b, and a liquid crystal display unit 70 is provided in the front case 69a.

The first housing 62 also has a front case 71a and a rear case 71b, and various operation keys are provided on the front case 71a. The operation keys include a numeric keypad 72a for inputting a telephone number and the like, a cursor movement key 72b for moving a cursor for various function menus, a call key 72c for starting a call by pressing it when receiving a call, turning on / off the power and after a call There are a power / end key 72d for ending a call by pressing and operating, function keys 73L and 73R arranged on the left and right of a center key 72f arranged at the center of the cursor movement key 72b, and the like.

  Front cases 69a and 71a, rear cases 69b and 71b, which are the aforementioned cases, numeric keys 72a which are operation keys, cursor movement keys 72b, call keys 72c, power / end key 72d, center key 72f, function keys 73L and 73R, etc. By forming at least one of the above-described ceramics for decorative parts according to the present embodiment, a cellular phone 60 that gives a consumer a sense of luxury, aesthetic satisfaction, and mental comfort over a long period of time and has such a color tone is provided. You can feel the satisfaction of owning it. Moreover, since the ceramic for decorative parts of this embodiment has good compatibility with other color tones, it can be used in combination with members of various color tones, so that it is possible to meet diversification of consumer preferences.

  Next, FIG. 8 is a perspective view showing an example of a notebook personal computer which is another example using the decorative component for a portable terminal of the present embodiment.

  A notebook personal computer 80 shown in FIG. 8 is attached to a main body side casing 84 having a keyboard 81, a track pad 82, and button switches 83L and 83R, and is attached to the main body side casing 84 through hinges 85L and 85R. And a display-side casing 87 provided with a display 86.

  The keyboard 81 is composed of a plurality of keys, and can input characters and call functions by pressing the keys. The track pad 82 is composed of a pressure-sensitive or electrostatic pointing device, and is used for moving a pointer on the screen of the display 86, inputting a command, or the like. For example, it is used for designating a file displayed as an icon on the display 86, selecting an application program, etc., and dragging an icon on the display 86 or selecting a plurality of character strings on a text file by a combination operation with the button switches 83L and 83R. Etc.

  Further, the button switch 83L is used not only for the above-described combination operation but also for commands such as opening / closing of a file designated or selected by the pointing function of the track pad 82 or execution of processing. There are functions for displaying a context menu on the screen of the display 86 and displaying attribute information of a file designated or selected by the pointing function of the track pad 82. Here, the context menu is a function for popping up a selectable process on the screen of the display 86.

  Further, by forming at least one of the keys and button switches 83a and 83b of the keyboard 81 with the ceramics for decorative parts of the present embodiment, it is possible to extend a sense of luxury, aesthetic satisfaction, and mental comfort to the consumer. It is possible to feel satisfaction by owning the notebook type personal computer 80 which is given over a period and exhibits such a color tone.

  In addition, although it demonstrated using the mobile phone 60 and the notebook personal computer 80 as an example of a portable terminal, the portable terminal using the ceramics for decorative parts of this embodiment is limited to the mobile phone 60 and the notebook personal computer 80. It is not a portable terminal such as a personal digital assistant (PDA), a portable car navigation system, an audio player, etc. This applies to mobile terminals.

  Next, FIG. 9 is a schematic diagram illustrating an example of a configuration of a soap case which is a decorative part for daily necessities of the present embodiment.

  This soap case 90 is composed of a main body 93 and a lid 92, and a discharge hole 95 for cutting off water adhering to the surface of the soap 91 is formed on the mounting surface 94 of the main body 93 on which the soap 91 is mounted. Has been. When the soap 91 is not used, the soap 91 is placed on the placement surface 94 of the main body 93 and stored by fitting the lid 92 to the main body 93. When the soap 91 is used, the lid 92 is removed from the main body 93 and the soap 91 is taken out and used. Then, by placing the used soap 91 on the mounting surface 94 of the main body 93, the water adhering to the surface of the soap 91 can be cut off by the discharge hole 95, and the soap 91 is dissolved in the water. It can be prevented.

  By forming the lid 92 or the main body 93, which is the soap case 90, with the ceramics for decorative parts of the present embodiment, satisfaction by possessing it by many customers and visual sense of luxury and aesthetic satisfaction when used And can give mental comfort.

  FIG. 10 is a perspective view showing an example of a coffee cup set which is another example of the decorative component for daily necessities of the present embodiment.

A coffee cup set 100 shown in FIG. 10 includes a coffee cup 101, a saucer 102, and a spoon 103. By forming the coffee cup 101, the saucer 102, and the spoon 103 with the ceramics for decorative parts of the present embodiment, many coffee cups are set. It is possible to give the consumer a sense of luxury, aesthetic satisfaction, and mental comfort through visual sense when using and satisfaction with possession.

In addition, since the ceramic for decorative parts of this embodiment is compatible with other colors, at least one of the coffee cup 101, the saucer 102, and the spoon 103 is formed with the ceramic for decorative parts of this embodiment, and the others are different. It can also be used in combination as a color tone.

In addition, the decorative parts for daily necessities of this embodiment include a soap case 90 and a coffee cup set 100.
In addition, it can be suitably used for decorative parts for daily necessities such as toothbrushes, razor patterns, earpicks and scissors. In particular, in the luxury hotel bathrooms and washrooms, using the ceramics for decorative parts of this embodiment for the amenity goods marked with various logos, etc., a sense of luxury, aesthetic satisfaction, and spirit that are produced with a strong extraordinary feeling. Peace of mind.

  Next, FIG. 11 is a perspective view showing an example of a vehicle body to which the vehicle article decorative component of the present embodiment is attached.

The vehicle body 110 shown in FIG. 11 is attached with an emblem 111 that is a decorative part for vehicle goods, and by forming the emblem 111 with the ceramic for decorative parts of the present embodiment,
Since it is possible to give a sense of luxury, aesthetic satisfaction, and mental comfort to the consumer, the decorative value of the vehicle body 110 can be increased. 11 shows the emblem 111 attached to the front of the vehicle body 110, but it is also possible to attach the emblem 111 indicating the manufacturer name, vehicle type name, etc. formed of the ceramics for decorative parts of the present embodiment to the rear of the vehicle body 110. The decorative value of the vehicle body 110 can be increased.

  FIG. 12 is a front view showing an example of a corner pole using the vehicle article decorative component of the present embodiment.

The corner pole 112 shown in FIG. 12 is attached to mark the left front of the vehicle body (in the case of a right-hand drive vehicle) that is difficult to see from the driver's seat when the vehicle is taken in and out of the parking lot. A lighting unit 115 including a light emitting diode (LED) and the like. By forming the pole portion 114 of the corner pole 112 with the ceramic for decorative parts of the present embodiment, or by attaching the emblem formed with the ceramic for decorative parts of the present embodiment in place of the lighting portion 115, the corner pole 112 is mounted. Of course, the decorative value of the vehicle body is improved.

  In addition, the vehicle decorative part of the present embodiment includes not only the emblem 111 and the corner pole 112 but also a part of a wheel cap, a part of a hood ornament provided on the hood of the vehicle body, and small items and accessories attached to the inside of the vehicle, or these. Even if it is used as a part, it is preferable because the decorative value is improved.

  Next, FIG. 13 is a front view showing an example of a golf club using the decorative component for sports equipment of the present embodiment.

A golf club 120 shown in FIG. 13 includes a shaft 121, a grip 122 attached to one end of the shaft 121, and a head 123 attached to the other end of the shaft 121. The head 123 has a face surface 123F that is a part that captures a golf ball and a sole surface 123S that is a part that contacts the ground. As shown in FIG. 13, the accessory is formed of ceramics for decorative parts according to this embodiment. If 124 is embedded in the face surface 123F, the decorative value is improved, which is preferable.

Further, in the decorative part for sports equipment of the present embodiment, not only the face surface 123F but also the accessory 124 formed of the ceramic for decorative parts of the present embodiment is embedded in the sole surface 123S and the grip 122, or the grip 122 itself is It is suitable even if it is formed with the ceramic for decorative parts of this embodiment.

  FIG. 14 is a bottom view showing an example of spike shoes using the decorative component for sports equipment of the present embodiment.

The spike shoe 130 shown in FIG. 14 is used, for example, for soccer or rugby, and a plurality of studs 132 formed in a protruding shape for fixing a shaft foot when kicking a ball are attached to the shoe sole 131. ing. When the ceramic for decorative parts of this embodiment is used as this stud 132, in addition to improving the decorative value, it has better wear resistance than conventionally used aluminum alloy studs, The replacement frequency of the stud 132 is reduced, and the cost for replacement can be reduced. Note that the surface of the stud 132 may be coated with a transparent resin in order to prevent the stud 132 from being chipped that may occur during the competition.

  Next, FIG. 15 is a perspective view showing an example of a guitar using the musical instrument decorative part of the present embodiment.

  The main configuration of the guitar 140 shown in FIG. 15 includes a main body 141 and a neck 142 extending forward from the main body 141. A nut 143 is disposed at the tip of the neck 142, and a tuning beg 145 capable of adjusting the tension of the string 144 is provided for each string 144 in front of the nut 143. A clamp mechanism 146 for holding the string 144 so as not to move with respect to the nut 143 is disposed near the nut 143.

On the other hand, a tremolo device 147 for giving an impressive sound effect by simultaneously increasing or decreasing the tension of the string 144 is attached to the main body 141. The tremolo device 147 includes a base plate 148 attached to the main body 141, a bridge saddle 149 held on the base plate 148 to hold the string 144 in a tunable manner, and a tremolo bar 150 that operates the tremolo device 147.
It is comprised by. Since the decorative value of the guitar 140 is improved by forming the base plate 148, the bridge saddle 149, the tremolo bar 150, etc. of the guitar 140 with the ceramics for decorative parts of the present embodiment, the guitar 140 is owned by the owner. It can make you feel satisfied and attract many spectators.

  Next, FIG. 16 is a schematic diagram illustrating an example of an artificial dental crown using the decorative component for accessory of the present embodiment.

The schematic diagram of FIG. 16 shows an artificial dental crown 151 attached to an abutment (appartment) 154 fixed to an artificial tooth root (implant) 153 embedded in a jawbone 152 inside a gingiva 155.
By forming this artificial dental crown 151 with the ceramics for decorative parts of the present embodiment, the teeth emit a golden shine, so that it is possible to give a high euphoria to consumers who prefer dental decorations.

In addition, an artificial tooth root 153 embedded in the jawbone 152 is formed in a screw shape, and at least one of chitin, collagen, and derivatives thereof having a high ability to induce the formation of new bone is formed in the screw-shaped portion. A hard bonding layer made of a biodegradable substrate including one kind may be formed. In addition, a soft bonding layer made of the crosslinked biodegradable base material may be formed on the base of the abutment 154 so as to contact the gingiva 155 positioned on the upper side of the jawbone 152.

  Since the ceramic for decorative parts of the present embodiment is made of a titanium nitride sintered body, it is easily adapted to a living body, and taking advantage of this advantage, not only the artificial crown 151 but also the artificial tooth root 153 and the abutment 154. It is also suitable to use.

  FIG. 17 is a front view showing an example of an earphone unit using the decorative component for accessory of the present embodiment.

An earphone unit 160 shown in FIG. 17 includes a speaker 161 that is inserted into the listener's ear shell and emits sound waves, a case 162 that houses the speaker 161, and a cord derivation unit 163 that contacts the case 162. A cord 164 for supplying an electric signal to 161 is provided.

  By forming the case 162 of the earphone unit 160 with the ceramics for decorative parts of the present embodiment, the decorative value is increased, and for an accessory that gives many consumers a sense of luxury, aesthetic satisfaction, and mental comfort. It can be a decorative part.

  FIG. 18 is a perspective view showing an example of eyeglasses using the decorative component for accessory of the present embodiment.

The eyeglasses 170 shown in FIG. 18 includes a pair of lenses 171a and 171b for correcting vision and protecting eyes from ultraviolet rays, a bridge 172 connecting the pair of lenses 171a and 171b, and the lenses 171a and 171a. Armor 173a, 173b connected to 171b, temples 174a, 174b connected to armor 173a, 173b so as to be able to rotate via a hinge, and lenses 171a, 171b via nose pad connecting members, respectively. And a nose pad 175 to be attached.

By forming at least one of the bridge 172, temples 174a, 174b and nose pad 175 of the eyeglass 170 with the ceramic for decorative parts of the present embodiment, the decorative value is increased, and a high-class feeling is visually recognized for many consumers. It can be set as a decorative part for jewelry that gives aesthetic satisfaction and mental comfort.

FIG. 19 is a perspective view showing an example of a handle for a door handle using the decorative component for building material of the present embodiment.

A door handle 180 shown in FIG. 19 includes an L-shaped main body 181 and a cylindrical grip 182 fitted to the end of the main body 181, and the grip 182 has a flange 183a formed from the tip side. It is fixed to the main body 181 by being sandwiched between the nut 183 and the flange 184 from the rear end side.

  By forming the grip 182 of the door handle 180 with the ceramics for decorative parts of the present embodiment, the decorative value is enhanced, and many customers can be given a sense of luxury, aesthetic satisfaction and mental comfort through vision. It can be a decorative part for building materials.

  Next, the manufacturing method of the ceramics for decorative parts of this embodiment is demonstrated.

In order to obtain the ceramic for decorative parts of the present embodiment, first, titanium nitride which is a main component in the sintered body and each powder of nickel, niobium, chromium and carbon are weighed, pulverized and mixed. Use as a raw material. More specifically, titanium nitride powder having an average particle size of 10 to 30 μm, nickel powder having an average particle size of 10 to 20 μm, niobium powder having an average particle size of 20 to 50 μm, and an average particle size of 30 Preparing ˜60 μm chromium powder and carbon powder having an average particle size of 0.1-10 μm,
7 to 14.5% by mass of nickel powder, 2.5 to 10% by mass of niobium powder, 1.5 to 6.5% by mass of chromium powder and 0.4 to 0.9% by mass of carbon powder, with the balance being titanium nitride powder What is necessary is just to measure and grind | pulverize and mix.

In order to form a grain boundary phase that binds titanium nitride in a state where nickel surrounds chromium, it is necessary to increase the frequency of contact between nickel powder and chromium powder. In order to increase the frequency, the pulverization / mixing time may be lengthened, for example, the pulverization / mixing time may be 150 hours or longer. At this time, silicon,
Phosphorus, sulfur, manganese, iron and the like can be mentioned, but since these may adversely affect the color tone of the decorative surface, each of them is preferably less than 0.5% by mass.

The titanium nitride powder may be a stoichiometric TiN or a non-stoichiometric TiN _1-x (0 <x <1). From the viewpoint of a color tone having a high decorative value, the purity of each powder is preferably 99% or more, and there is no problem even if the titanium nitride powder partially reacts with the nickel powder to produce a small amount of TiNi. In particular, in order to _satisfy 0.8 ≦ x ≦ 0.96 when the composition formula is TiN _x for the titanium nitride sintered body forming the ceramic for decorative parts, the titanium nitride powder is 0.7 ≦ 0.7 when the composition formula is TiN _x. Those with x ≦ 0.9 may be used.

  Next, for example, water is added to the blended raw material, and after mixing and pulverizing using a mill, a predetermined amount of paraffin wax is added as a binder, and a desired molding method such as a dry pressure molding method, cold isostatic pressing is performed. Molded into a desired shape such as a disc, flat plate, or torus by the method of extrusion or extrusion.

When dry press is selected as the molding method, the molding pressure affects the open porosity and Vickers hardness (Hv) on the decorative surface, so the molding pressure is preferably 49 to 196 MPa. The molding pressure is set to 49 to 196 MPa because a sintered body having a relative density of 95% or more and an open porosity of 2.5% or less can be obtained, and the Vickers hardness (Hv) is 8 GP.
It is because it can be set to a or more. In addition, the life of the mold can be extended.

And after degreasing | defatting the obtained molded object in inert gas atmosphere and maintaining the temperature and pressure of this inert gas at 310-390 degreeC and 30-60 kPa, respectively, a nitrogen and inert A sintered body having a relative density of 95% or more with respect to the theoretical density is obtained by housing the degreased body in a ceramic container in at least one gas atmosphere selected from gases or under vacuum. Note that firing in at least one gas atmosphere selected from nitrogen and an inert gas or in vacuum is because, when firing in an oxidizing atmosphere, titanium is oxidized and most of it is expressed by the composition formula TiO _2. This is because it is affected by the white color tone that this titanium oxide essentially has, and the overall color tone of the ceramic for decorative parts is whitish.

Moreover, when obtaining ceramics for decorative parts by firing in a vacuum, the degree of vacuum is preferably 1.33 Pa or less. The reason why the degree of vacuum is 1.33 Pa or less is to obtain golden ceramics for decorative parts without oxidation of titanium during firing and the hue of ceramics for decorative parts becoming whitish. Furthermore, it is preferable that the firing temperature is 1200 to 1800 ° C. This is because a sintered body having a relative density of 95% or more and an open porosity of 2.5% or less can be obtained, and the firing cost can be reduced.

  In addition, in order to increase the thermal conductivity of the titanium nitride sintered body to 22 W / (m · K) or more, lithium, sodium, potassium, iron, calcium, magnesium, strontium, and barium that cause the thermal conductivity to decrease. , Manganese and boron content may be 0.3% by mass or less in total with respect to 100% by mass of ceramics for decorative parts. On the other hand, in order to set the thermal conductivity of the titanium nitride sintered body to 26 W / (m · K) or less, since it is required to suppress grain growth, it may be set to 1200 ° C. or higher and 1550 ° C. or lower.

  And the surface where the decorative value of the obtained sintered body is required is subjected to lapping using a lapping machine, and then subjected to barrel polishing so that the surface of the sintered body has a golden color tone. The ceramic for decorative parts of this embodiment can be obtained. In addition, it is preferable that the pores appearing on such a decorative surface have a maximum diameter of 30 μm or less, and by setting this range, adhesion of germs, foreign matters, contaminants, etc. into the pores is possible. Can be reduced.

  When the shape of a product made of ceramics for decorative parts is complex, close to the block shape or product shape by dry pressure molding, cold isostatic pressing, extrusion molding, injection molding, etc. After forming into a shape, cutting may be performed, or after sintering the formed body, grinding may be performed to obtain a product shape to obtain a product shape, and lapping and barrel polishing may be performed sequentially, or from the beginning. A product shape may be obtained by an injection molding method, and after firing, lapping and barrel polishing may be sequentially performed.

  Here, in order to set the arithmetic average height Ra of the surface to be a decorative surface to 0.03 μm or less, diamond abrasive grains having a small average particle diameter may be supplied to a lapping machine made of tin and lapped. Diamond abrasive grains having a diameter of 1 μm or less may be used. In barrel polishing, a rotating barrel polishing machine may be used, and green carborundum (GC) as a medium may be charged into the rotating barrel polishing machine and performed wet for 24 hours.

The ceramic for decorative parts of the present embodiment obtained as described above exhibits a golden color that is highly evaluated as a particularly beautiful color tone, has a high-class feeling, and can obtain an aesthetic satisfaction. As described above, the watch case, the watch decorative piece for the watch, such as the watch case, the mobile phone, the decorative part for the portable terminal such as the notebook personal computer, the soap case, Coffee cup set, knife, fork, toothbrush, razor handle, earpick, scissors, decorative parts for daily parts such as stamps and business cards, vehicle decorative parts such as emblems and corner poles for manufacturers and car models, golf Decoration parts for sports equipment that decorates clubs and spiked shoes, decoration parts for musical instruments that decorate guitars, etc., decoration of earphone units Artificial crowns, eyeglasses, brooches, necklaces, earrings, rings, bracelets, anklets, tie pins, tie tacks, medals, buttons and other decorative parts for accessories, tiles for floors, walls, ceilings, and grips for door handles It can be suitably used as a decorative part for building materials. In addition, a watch and a mobile phone are combined, and can be suitably used as a decorative part for a wristwatch type mobile phone having both functions.

  Examples of the present invention will be specifically described below, but the present embodiment is not limited to these examples.

First, titanium nitride powder (purity 99%, average particle size 22.3μm), nickel powder (purity 99.5%, average particle size 12.8μm), niobium powder (purity 99.5%, average particle size 33μm), Table 1 shows the ratios (contents) in the sintered body of chromium powder (purity 99%, average particle size 55 μm) and carbon powder (purity 99% or more, average particle size 0.5 μm). Were weighed, pulverized and mixed to prepare a blended raw material.

  Next, water is added to each of the resulting blended raw materials, pulverized and mixed for 72 hours using a vibration mill, and then 3 parts by weight of paraffin wax as a binder is added to the blended raw materials and dried by spray drying. To give granules. And the obtained granule was pressure-molded with the pressure of 98 Mpa, and the molded object was produced. Next, the molded body was degreased while maintaining the temperature and pressure of the gas shown in Table 1 in an inert gas atmosphere to obtain a degreased body, and then a baking powder mainly composed of aluminum nitride was dispersed. The degreased body is placed in the ceramic container and is fired by holding at 1530 ° C. for 2 hours in a nitrogen atmosphere to obtain a sintered body having the shape of the case back 4 shown in FIG. It was.

  Then, using a rotating barrel polishing machine, water and green carborundum (GC) were added as media and barrel polishing was performed for 24 hours. A ceramic for decorative parts, which is a back cover 4 for a watch made of 1 to 29 titanium nitride sintered bodies, was obtained.

Then, after measuring the distance p between the centers of the mounting holes 18a and 18c of each sample at a magnification of 100 using a measuring microscope, the sample No. The distance p of 10 is set as the reference value 1, and the measured value of the distance p of each sample is calculated as a relative value. If the relative value of the distance p is 0.998 or more and 1.002 or less, it passes and falls outside the standard range. Was judged to be unacceptable as out of the standard range.

In addition, the X-ray diffraction method was used to check for the presence of niobium oxide in the portion excluding the area within 0.1 mm from the surface of each sample. For samples in which niobium oxide was detected, x was detected. The samples that were not shown are shown in Table 1.

The contents of titanium, nickel, niobium and chromium constituting each sample were measured using a fluorescent X-ray analysis (XRF) apparatus, and carbon was measured using a carbon analysis apparatus. The arithmetic average height Ra of the decorative surface is measured using a stylus type surface roughness meter in accordance with JIS B 0601-2001, with a measurement length of 5 mm, a cutoff value of 0.8 mm, and a stylus tip radius. 2μ
m, 5 points were measured at a scanning speed of the stylus of 0.5 mm / second, and the average value was calculated. Furthermore, for the fracture toughness _{K 1c,} JIS R defined indenter penetration method in 1607-1995: conforms to (IF method indentation-Fracture method) fracture toughness _{K 1c} was measured for hardness,
In accordance with JIS R 1610-2003, the Vickers hardness Hv (hereinafter referred to as hardness) of the decorative surface was measured at five locations, and the average value was calculated.

  In addition, regarding the brightness index and chromaticness index of each sample, in accordance with JIS Z 8722-2009, the light source of the spectrocolorimeter (Konica Minolta Holdings Co., Ltd. CM-3700d) was used as the CIE standard light source D65, and the viewing angle as The color tone of the decorative surface was measured by setting 10 ° and the measurement range to 3 × 5 mm.

In addition, regarding gloss and color tone, a questionnaire survey was conducted on a total of 40 monitors, 5 men and women for each age group in their 20s and 50s, with three items: luxury, aesthetic satisfaction, and mental comfort. For the survey results of the three items of luxury, aesthetic satisfaction, and mental comfort, ranking was conducted, and the percentage of monitors that answered “obtained” was 90% or more, “excellent” Of the above three items, at least one item is 80% and the remaining items are 90%.
Of the three items, at least one item was 70% and the remaining items were 80%, and one item was less than 70%. In addition, in all three items of luxury, aesthetic satisfaction, and mental comfort, Sample No. Sample No. 10 with 10 as the standard sample. The color difference of each sample with respect to 10 was calculated using the above-described formula (A).

  The results are shown in Tables 1 and 2.

表１に示す通り、ニオブの酸化物が検出された試料Ｎｏ．８は、距離ｐの相対値が規格寸法の範囲から外れているのに対し、本実施形態の試料Ｎｏ．１〜７，９〜16，18〜22，24〜29は、ニオブの酸化物が検出されず、内部に実質的にニオブの酸化物を含んでいないことから、距離ｐの相対値が規格寸法の範囲内にあることが分かる。

As shown in Table 1, sample No. 1 in which niobium oxide was detected was detected. 8 shows that the relative value of the distance p is out of the range of the standard dimension, whereas the sample No. 1 to 7, 9 to 16, 18 to 22, and 24 to 29, the niobium oxide is not detected, and the niobium oxide is not substantially contained inside, so the relative value of the distance p is the standard dimension. It turns out that it exists in the range of.

  Sample No. Sample No. 17 shows that since nickel which acts as a binder for bonding titanium nitride crystals was 0% by mass, an unsintered portion was confirmed and could not be used for a decorative part. In No. 23, the content of niobium was 0% by mass, so that the decorative value required by the monitor could not be obtained and the monitor could not be satisfied.

  Further, as shown in Table 2, the sample No. 1 in which niobium oxide was detected was detected. No. 8 was not able to obtain the luster, so the decorative value required by the monitor could not be obtained, and there was no response saying “obtained” in each of the items of luxury, aesthetic satisfaction, and mental comfort. It turns out that it was not possible to satisfy.

Further, as shown in Table 2, in particular, sample No. 3 to 7, 9 to 11, 13 to 22, and 24 to 29 are standard samples with high fracture toughness and hardness because the carbon content on the decorative surface is 0.4 mass% or more and 0.9 mass% or less. Sample No. It can be seen that the color difference (ΔE * ab) with respect to 10 is small and the decorative value required by the monitor is obtained. In addition, the black color of carbon shows a slight tendency to achromatic color and suppresses uneven color. Since the color difference (ΔE * ab) with respect to 10 could be reduced, the difference in color tone generated between the decorative parts was hardly felt.

  In particular, the sample No. of this embodiment. 3-7, 9-11, 15, 16, 19-21, 25-27, the arithmetic average height Ra of the decorative surface is 0.03 μm or less, and the brightness of the decorative surface in the CIE1976L * a * b * color space The index L * is 72 or more and 84 or less, and the chromaticness index a * and b * is 3 or more and 9 or less and 27 or more and 36 or less, respectively, so the light reflectance on the decorative surface is high, and the gloss increases. The ratio of monitors that answered “I can get” for luxury, aesthetic satisfaction, and mental comfort is 90% or more, indicating that the monitors are fully satisfied.

  Changes in characteristics due to intermetallic compounds composed of nickel and niobium or titanium were confirmed.

  First, the same raw materials as in Example 1 were prepared, weighed so that the ratio (content) in the sintered body was the ratio shown in Table 3, and then pulverized and mixed with water for the time shown in Table 3. It was used as a blended raw material. Next, sample No. 1 was manufactured by the same manufacturing method as in Example 1. Ceramics for decorative parts comprising 30 to 34 titanium nitride sintered bodies were obtained. However, as for the baking powder, the baking powder having an aluminum nitride content of 95% by mass was used for all the samples.

  And in the decorative surface of the ceramic for decorative parts, the intermetallic compound which consists of nickel, niobium, or titanium was identified by the X ray diffraction method, and the identified composition formula was shown in Table 3.

  Thereafter, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured in the same manner as in Example 1, and a questionnaire survey was conducted on three items of high-class feeling, aesthetic satisfaction, and mental comfort. Sample No. Sample No. 34 with 34 as the standard sample. The color difference of each sample with respect to 34 was calculated using equation (A) described above.

  The obtained results are shown in Table 3.

表３に示す通り、ニッケルと、ニオブまたはチタンとからなる金属間化合物が装飾面に含まれている試料Ｎｏ．31〜33は、上記金属間化合物が装飾面に含まれていない試料Ｎｏ．30，34よりも装飾面における明度指数Ｌ＊の値が大きくなるので、気品漂う明るさが醸し出されるので、より高い高級感および美的満足感をモニターに与えていることが分かる。

As shown in Table 3, a sample No. 1 in which an intermetallic compound composed of nickel and niobium or titanium is included in the decorative surface. Samples Nos. 31 to 33 are sample Nos. In which the intermetallic compound is not included in the decorative surface. Since the value of the lightness index L * on the decorative surface is larger than 30 and 34, it is possible to bring out a dignified brightness, giving the monitor a higher level of luxury and aesthetic satisfaction.

  A test was conducted to confirm the change in characteristics due to the difference in the composition formula of the titanium nitride powder.

First, titanium nitride powder was prepared in which the number of atoms x when the composition formula of the titanium nitride sintered body was TiN _x was the value shown in Table 4, and the same raw materials as in Example 1 were prepared for the other raw materials. . Next, it was weighed so that the ratio (content) in the sintered body would be the ratio shown in Table 3, and pulverized and mixed to prepare a blended raw material. Next, sample No. 1 was manufactured by the same manufacturing method as in Example 1. Ceramics for decorative parts made of 35 to 39 titanium nitride sintered bodies were obtained.

  Thereafter, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured in the same manner as in Example 1, and a questionnaire survey was conducted on three items of high-class feeling, aesthetic satisfaction, and mental comfort. In addition, in all three items of luxury, aesthetic satisfaction, and mental comfort, Sample No. Sample No. 38 with 38 as the standard sample. The color difference of each sample with respect to 38 was calculated using equation (A) described above.

Furthermore, the value of the number of atoms x when the composition formula was TiN _x was obtained. Specifically, the oxygen and nitrogen contents are measured using an oxygen / nitrogen analyzer, and the content of titanium and nitrogen is obtained by subtracting from the mass of 100% by mass together with the carbon content. The number of moles was obtained by dividing each by the respective atomic weights, and the value of the ratio of nitrogen when the mole number of titanium was 1 was defined as the number of atoms x.

  Table 4 shows the obtained results.

表４に示す通り、原子数ｘの値が0.8未満の試料Ｎｏ．35および原子数ｘの値が0.96を
超える試料Ｎｏ．39と比較して、原子数ｘが0.8以上0.96以下である試料Ｎｏ．36〜38は
、光沢のある色調感が増すために、より高い高級感，美的満足感および精神的安らぎをモニターに与えていることが分かる。

As shown in Table 4, the sample No. Sample No. 35 having a value of 35 and the number of atoms x exceeding 0.96. Compared to Sample No. 39, Sample No. with an atomic number x of 0.8 to 0.96. It can be seen that Nos. 36 to 38 give the monitor a higher level of luxury, aesthetic satisfaction and mental comfort because the glossy color tone is increased.

  A test was conducted to confirm changes in characteristics due to differences in the contents of Ni and Nb.

  First, sample no. The titanium nitride powder used for 38 was prepared, and the same raw materials as in Example 1 were prepared for the other raw materials. Next, it was weighed so that the ratio (content) in the sintered body would be the ratio shown in Table 5, and pulverized and mixed to prepare a blended raw material. Next, sample No. 3 was manufactured by the same manufacturing method as in Example 3. Ceramics for decorative parts comprising 40 to 51 titanium nitride sintered bodies were obtained.

  Thereafter, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured in the same manner as in Example 1, and a questionnaire survey was conducted on three items of high-class feeling, aesthetic satisfaction, and mental comfort. In addition, in all three items of luxury, aesthetic satisfaction, and mental comfort, the sample No. Sample No. 38 with 38 as the standard sample. The color difference of each sample with respect to 38 was calculated using equation (A) described above. Furthermore, the number of atoms x was determined by the same calculation method as in Example 3.

  The results obtained are shown in Table 5.

表５に示す通り、試料Ｎｏ．41〜43，46〜50は、ニッケルを７質量％以上14.5質量％以下、ニオブを2.5質量％以上10質量％以下の含有量で含むことから、明度指数Ｌ＊が72以
上84以下，クロマティクネス指数ａ＊，ｂ＊がそれぞれ３以上９以下，27以上36以下となり、高級感，美的満足感および精神的安らぎをともに「得られる」と回答したモニターの比率が90％以上となっており、モニターを十分満足させられていることが分かる。

As shown in Table 5, sample no. 41 to 43 and 46 to 50 contain nickel in a content of 7% to 14.5% by weight and niobium in a content of 2.5% to 10% by weight, so the lightness index L * is 72 to 84, chromaticness The indices a * and b * are 3 to 9 and 27 to 36, respectively, and the ratio of monitors who answered that they can “acquire” luxury, aesthetic satisfaction and mental comfort is 90% or more. It turns out that the monitor is fully satisfied.

  A test was conducted to confirm the change in characteristics due to the difference in the Cr content.

  First, the same raw material as in Example 1 was prepared, weighed so that the ratio (content) in the sintered body was the ratio shown in Table 6, pulverized and mixed to prepare the prepared raw material. Next, sample No. 1 was manufactured by the same manufacturing method as in Example 1. Ceramics for decorative parts made of 52 to 57 titanium nitride sintered bodies were obtained.

  Thereafter, in the same manner as in Example 1, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured. Next, among the corrosion resistance tests specified in JIS B 7001-1995, an artificial sweat semi-immersion test (40 ± 2 ° C, left for 24 hours) is performed, and the color tone of each sample after the test is measured. The difference between L * and chromaticness index a *, b * was calculated.

  The results obtained are shown in Table 6.

表６に示す通り、クロムを1.5質量％未満の含有量で含む試料Ｎｏ．52に比べて、試料
Ｎｏ.53〜56は、クロムを1.5質量％以上の含有量で含むことから、空気中の酸素と結合して装飾面に緻密な酸化被膜を生成して耐食性を向上させ、明度指数Ｌ＊，クロマティクネス指数ａ＊，ｂ＊とも試験前後の変化が少なく、耐食性が良好であることが分かる。

As shown in Table 6, Sample No. containing chromium at a content of less than 1.5% by mass. Compared to 52, sample Nos. 53 to 56 contain chromium in a content of 1.5% by mass or more, so that they combine with oxygen in the air to form a dense oxide film on the decorative surface and improve corrosion resistance. It can be seen that the brightness index L * and the chromaticness index a *, b * both have little change before and after the test and have good corrosion resistance.

However, when the chromium content exceeds 6.5 mass%, the sample No. As can be seen from FIG. 57, although the corrosion resistance is good, the chromaticness indices a * and b * indicating vividness are both lowered. Therefore, in order to achieve both corrosion resistance and vividness, Sample No. As shown to 53-56, it is more suitable to contain chromium by content of 1.5 mass% or more and 6.5 mass% or less.

  A test was conducted to confirm the change in characteristics due to the difference in open porosity.

  First, the same raw material as in Example 1 was prepared, weighed so that the ratio (content) in the sintered body was the ratio shown in Table 7, and pulverized and mixed to prepare a blended raw material. Next, the same manufacturing method as in Example 1 is performed before barrel polishing, and the diameter of the green carborundum (GC) used for barrel polishing is varied in order to confirm the influence of the open porosity on the lightness index L *. Sample No. with an open porosity adjusted by Ceramics for decorative parts made of 58-61 titanium nitride sintered bodies were obtained.

After that, the open porosity of the decorative surface was taken with a metal microscope, the magnification was set to 200 times, the image of the decorative surface was captured with a CCD camera, and one field in the image was captured by an image analyzer (LUZEX-FS manufactured by Nireco Corporation). The measurement area was 2.25 × 10 ⁻² mm ² , the number of fields of view was 20, that is, the open porosity when the total measurement area was 4.5 × 10 ⁻¹ mm ² was obtained and used as the open porosity of the decorative surface. Example 1
Similarly, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured, and a questionnaire survey was conducted on three items of luxury, aesthetic satisfaction, and mental comfort.

  The results obtained are shown in Table 7.

表７に示す通り、開気孔率が2.5％を超える試料Ｎｏ．61に比べて、開気孔率が2.5％以下の試料Ｎｏ．58〜60は、明度指数Ｌ＊の値を76以上にすることができ、より好まれる色調となり、高級感，美的満足感および精神的安らぎをともに「得られる」と回答したモニターの比率が90％以上となっており、モニターを十分に満足させられていることが分かる。

As shown in Table 7, Sample No. with an open porosity exceeding 2.5%. Compared with Sample No. 61, the open porosity was 2.5% or less. For 58-60, the brightness index L * can be increased to 76 or more, and the color tone is more favored, and the ratio of monitors that answered that they can obtain high-quality, aesthetic satisfaction and mental comfort is 90 It is understood that the monitor is sufficiently satisfied.

  The change of the characteristics by the compound which consists of chromium and nickel was confirmed.

  First, the same raw materials as in Example 1 were prepared, weighed so that the ratio (content) in the sintered body was the ratio shown in Table 8, and pulverized and mixed to prepare a blended raw material. Next, sample No. 1 was manufactured by the same manufacturing method as in Example 1. Ceramics for decorative parts comprising 62 to 64 titanium nitride sintered bodies were obtained. However, the atmosphere in firing was vacuum, and firing was performed at a vacuum degree shown in Table 8.

  And the intermetallic compound which consists of chromium and nickel was identified by the X ray diffraction method in the unpolished surface of the ceramics for decorative parts, and the identified composition formula was shown in Table 8.

表８に示す通り、試料Ｎｏ．63，64は、クロムおよびニッケルからなる金属間化合物を含むことから、クロムおよびニッケルからなる金属間化合物を含まない試料Ｎｏ．62に比べ、時計用装飾部品および携帯端末機用装飾部品等に用いられても磁気の影響を及ぼしにくくなるといえる。

As shown in Table 8, sample no. Since Samples 63 and 64 include an intermetallic compound composed of chromium and nickel, Sample No. 63 does not include an intermetallic compound composed of chromium and nickel. Compared to 62, it can be said that even when used in a decorative part for a watch, a decorative part for a portable terminal, etc., it is less likely to be affected by magnetism.

  Changes in characteristics due to differences in average crystal grain size were confirmed.

  First, the same raw materials as in Example 1 were prepared, and weighed so that the ratio (content) in the sintered body was the ratio shown in Table 9, and then the raw material particle size was adjusted by varying the pulverization time. It was used as a blended raw material. Next, the same manufacturing method as in Example 1 was performed before barrel polishing, and the sample having an adjusted average crystal grain size was confirmed in order to confirm the influence on the three-point bending strength and the brightness index L * due to the difference in the average crystal grain size. No. Ceramics for decorative parts made of 65 to 75 titanium nitride sintered bodies were obtained.

After that, the fractured surface was magnified 3000 times by scanning electron microscope 86-110μm × 65-92μ
The average crystal of the titanium nitride sintered body is obtained by drawing eight straight lines of the same length in the range of m and dividing the number of crystals existing on these eight straight lines by the total length of these straight lines. The particle size was taken.
The three-point bending strength was measured according to JIS R 1601-2008. Further, the contents of nickel, niobium, chromium and carbon, the arithmetic average height Ra, and the color tone were measured in the same manner as in Example 1, and a questionnaire survey was conducted on three items of high-class feeling, aesthetic satisfaction, and mental comfort.

  Table 9 shows the obtained results.

表９に示す通り、窒化チタン質焼結体の平均結晶粒径が1μｍに満たない試料Ｎｏ．65
および10μｍを超える試料Ｎｏ．75に比べて、窒化チタン質焼結体の平均結晶粒径が１μｍ以上10μｍ以下の試料Ｎｏ．66〜74は、３点曲げ強度が640ＭＰａ以上となると共に高
級感，美的満足感および精神的安らぎをともに「得られる」と回答したモニターの比率が90％以上となっており、モニターを十分に満足させられていることが分かる。

As shown in Table 9, the sample No. 1 in which the average crystal grain size of the titanium nitride sintered body is less than 1 μm. 65
And sample Nos. Exceeding 10 μm. Compared to Sample No. 75, the average crystal grain size of the titanium nitride sintered body is 1 μm or more and 10 μm or less. 66-74 has a three-point bending strength of 640 MPa or higher, and the ratio of monitors that answered that they can “acquire” both high-class feeling, aesthetic satisfaction, and mental comfort is 90% or more. You can see that you are satisfied.

  Using the ceramics for decorative parts of the present embodiment as described above, decorative parts for clocks, decorative parts for mobile terminals, decorative parts for wristwatch-type mobile phones, decorative parts for household goods, decorative parts for vehicle goods , If used as a decorative component for sports equipment, a decorative component for musical instruments, a decorative component for jewelry, or a decorative component for building materials, it exhibits a golden color that is highly evaluated as a beautiful color tone, and has a high-class feel and aesthetic satisfaction. As a result, mental comfort can be obtained through vision, which is preferable.

1: Ceramics for decorative parts 2: Decorative parts 3: Composite decorative parts
10A, 10B: Watch case
11: Recess
12: Foot
13: Bottom
14: Torso
15: Hole
17: Back cover for watch
20: Nakakoma
21: Through hole
30: Outer piece
31: Pin hole
40: Pin
50: Watch band
60: Mobile phone
80: Notebook personal computer
90: soap case
100: Coffee cup set
110: Body
112: Corner pole
120: Golf club
130: Spike shoes
140: Guitar
151: Artificial dental crown
160: Earphone unit
170: glasses
180: Door handle

Claims (18)

A ceramic for decorative parts, comprising a titanium nitride sintered body containing nickel, niobium, chromium and carbon, and containing substantially no niobium oxide inside. The ceramic for decorative parts according to claim 1, wherein the carbon content in the decorative surface is 0.4 mass% or more and 0.9 mass% or less. The arithmetic average height Ra of the decorative surface is 0.03 μm or less, the lightness index L * in the CIE 1976 L * a * b * color space of the decorative surface is 72 or more and 84 or less, and the chromaticness index a *, b *. The ceramics for decorative parts according to claim 1 or 2, wherein each is 3 or more and 9 or less and 27 or more and 36 or less. 4. The ceramic for decorative parts according to claim 1, wherein the titanium nitride sintered body includes an intermetallic compound composed of the nickel and the niobium or titanium on a decorative surface. 5. . 5. The decorative part according to claim 1, wherein the titanium nitride sintered body satisfies 0.8 ≦ x ≦ 0.96 when the composition formula is TiN _x . Ceramics. The nickel according to any one of claims 1 to 5, wherein the nickel is contained in a content of 7% by mass to 14.5% by mass and the niobium is contained in a content of 2.5% by mass to 10% by mass. Ceramics for decorative parts. The ceramic for decorative parts according to any one of claims 1 to 6, wherein the chromium is contained in a content of 1.5 mass% or more and 6.5 mass% or less. The ceramic for decorative parts according to any one of claims 1 to 7, wherein the titanium nitride sintered body includes an intermetallic compound composed of the chromium and the nickel. The ceramic for decorative parts according to any one of claims 1 to 8, wherein the titanium nitride sintered body has an average crystal grain size of 1 µm or more and 10 µm or less. A composite decorative part comprising the ceramic for decorative part according to any one of claims 1 to 9 and a decorative part having a decorative surface having a color different from that of the ceramic for decorative part. A decorative part for a watch, comprising the ceramic for a decorative part according to any one of claims 1 to 9. A decorative part for a portable terminal comprising the ceramic for a decorative part according to any one of claims 1 to 9. A decorative part for daily goods, comprising the ceramic for decorative part according to any one of claims 1 to 9. A decorative part for a vehicle article comprising the ceramic for a decorative part according to any one of claims 1 to 9. A decorative part for sports equipment, comprising the ceramic for decorative part according to any one of claims 1 to 9. A decorative part for musical instruments, comprising the ceramic for decorative parts according to any one of claims 1 to 9. A decorative part for jewelry, comprising the ceramic for a decorative part according to any one of claims 1 to 9. A decorative part for building materials, comprising the ceramic for decorative parts according to any one of claims 1 to 9.

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