JP6495711B2 - Cermet decorative member, watch, portable terminal and accessory using the same - Google Patents

Description

  The present invention relates to a cermet decorative member, and a timepiece, a portable terminal, and a jewelry using the same.

  Conventionally, gold, silver, alloy, or various metal plated members have been used as decorative members that exhibit gold or silver color, but any of the decorative members plated with gold, silver, alloys, or plated has a hardness. Since it is low, there is a problem that the surface is easily scratched by contact with a hard substance.

  As a material that can solve such problems, a cermet decorative member mainly composed of titanium carbide, titanium nitride, or titanium carbonitride is used. For example, the arithmetic average roughness is 0.03 μm or less. The polished surface is a glossy surface, giving the consumer a sense of quality and high aesthetic satisfaction.

  Then, in such a decorative member using cermet as a base material, as a means for displaying arbitrary characters, numbers, figures, etc., after polishing the surface of the base material, mask the portion where the characters etc. are to be displayed, A means is known in which blast processing is performed on a portion other than a portion where it is desired to display.

  By using the above-described means, the part where characters and the like are to be displayed is a high-quality surface state, and the characters and the like can be identified by the difference in surface roughness from the part other than the part where the characters and the like are to be displayed. It will be possible. However, in recent years, there has been a demand for a cermet decorative member that can give a high-class feeling and high aesthetic satisfaction to consumers by highlighting characters or the like to be displayed.

  The present invention has been devised to satisfy the above-described requirements, and by making a character or the like to be displayed stand out, a cermet decorative member capable of giving a consumer a sense of quality and high aesthetic satisfaction, and a An object of the present invention is to provide a watch, a portable terminal, and a jewelry to be used.

  In the decorative member made of cermet according to the present invention, the decorative surface includes a display surface and a background surface, the arithmetic average roughness Ra on the display surface is 0.03 μm or less, and the arithmetic average roughness Ra on the background surface is Rp / Rv, which is a ratio of the maximum peak height Rp of the roughness curve on the background surface and the maximum valley depth Rv of the roughness curve, is 0.5 to 1. It is characterized by being 5 or less.

  The timepiece, portable terminal or accessory of the present invention is characterized by using the cermet decorative member having the above-described configuration.

The cermet decorative member of the present invention and the timepiece, portable terminal, and accessory using the cermet decorative member have a glossy golden or silver color display surface, so that the consumer has a sense of luxury and high aesthetics. Satisfaction can be given.

An example of the decorative member made from cermet of this embodiment is shown, (a) is a front view of a dial for timepieces, (b) is a front view of a key in a portable terminal, (c) is a ring (jewelry) FIG.

  Hereinafter, embodiments of the cermet decorative member of the present invention will be described.

  1A and 1B show an example of a cermet decorative member according to the present embodiment, FIG. 1A is a front view of a dial for a watch, FIG. 1B is a front view of a key in a portable terminal, and FIG. FIG. 3 is a perspective view of a ring (jewelry).

  The decorative member made of cermet of this embodiment has a display surface and a background surface, the arithmetic average roughness Ra on the display surface is 0.03 μm or less, and the arithmetic average roughness Ra on the background surface is 0. Rp / Rv, which is a ratio between the maximum peak height Rp of the roughness curve on the background and the maximum valley depth Rv of the roughness curve, is 0.5 or more and 1.5 or less. It is as follows.

  In addition, the decorative surface in this embodiment is a surface for which decorativeness is required, and does not include a surface that is not exposed, that is, is not visually recognized. Specifically, in the case of the dial for the watch shown in FIG. 1A and the key in the portable terminal shown in FIG. 1B, the illustrated surface is a decorative surface and the back surface is a decorative surface. is not. Further, a surface that is not visually recognized by wearing, for example, a surface that is not exposed when the ring of FIG. 1C is fitted to a finger or the like is not a decorative surface.

  In addition, the display surface is a surface on which characters in FIGS. 1A to 1C are written, and the other part hits the background, and in FIGS. 1A to 1C, In order to indicate the color tone difference between the display surface and the background surface, each of them is colored and illustrated.

  Since the cermet decorative member of the present embodiment satisfies such a configuration, the display surface exhibiting a glossy golden or silver color tone stands out, so that a high-class feeling and high aesthetic satisfaction are provided to the consumer. Can be given.

  In this way, the display surface stands out in this way, in addition to the difference in arithmetic mean roughness Ra between the display surface and the background surface, and the maximum peak height Rp of the roughness curve on the background surface. This is because, when Rp / Rv, which is a ratio to the maximum valley depth Rv of the roughness curve, is 0.5 or more and 1.5 or less, variation in color tone due to light is small.

  Thus, the cermet decorative part of the present embodiment is particularly characterized by the surface properties of the background. For example, it is possible to adjust the arithmetic average roughness Ra on the background to the above-mentioned range also by performing blasting with glass that is conventionally used as abrasive grains for blasting. However, the surface blasted with glass has a large maximum valley depth Rv of the roughness curve, and the variation in the valley depth is large, so that the variation in color tone due to light increases. Rp / Rv on the surface blasted with glass is about 0.1 to 0.2.

On the other hand, in the decorative member made of cermet of this embodiment, Rp / Rv, which is a ratio of the maximum peak height Rp of the roughness curve on the background surface and the maximum valley depth Rv of the roughness curve, is 0.5 or more. Since the difference between the maximum peak height Rp of the roughness curve and the maximum valley depth Rv of the roughness curve is small, the variation in color tone due to light is small. Rp / Rv is more preferably 0.75 or more and 1.25 or less.

  When Rp / Rv is less than 0.5 or exceeds 1.5, either the maximum peak height Rp of the roughness curve or the maximum valley depth Rv of the roughness curve is relatively large. For this reason, variations in color tone due to light increase.

Here, with respect to the method for measuring the arithmetic average roughness Ra on the background, the background surface is taken as the measurement surface, and a stylus type surface roughness meter (for example, manufactured by AMETEK Co., Ltd.) according to JIS B 0601-2001.
Using Talysurf S4C), the measurement length is 4 mm, the cutoff value is 0.8 mm, the stylus tip radius is 2 μm, and the stylus scanning speed is 1 mm / second.

  Next, a method for calculating Rp / Rv, which is the ratio between the maximum peak height Rp of the roughness curve on the background and the maximum valley depth Rv of the roughness curve, will be described. First, as a measuring instrument, a surface roughness meter similar to the measurement of arithmetic average roughness Ra is used. And it measures for one direction on the conditions mentioned above. Next, the measurement is performed in the same manner in the direction orthogonal to the previously measured direction. Accordingly, the maximum peak height Rp of the roughness curve in one direction and the maximum valley depth Rv of the roughness curve, and the maximum peak height Rp of the roughness curve and the maximum valley depth of the roughness curve in a direction orthogonal to the one direction. Rv is obtained. Then, the respective average values are set as the values of the maximum peak height Rp of the roughness curve and the maximum valley depth Rv of the roughness curve on the background, and these values are used to determine the maximum peak height Rp of the roughness curve. Rp / Rv can be calculated by dividing the value by the value of the maximum valley depth Rv of the roughness curve.

  In the cermet decorative member of the present embodiment, it is preferable that the skewness Rsk of the roughness curve on the background is −0.5 or more and 0.2 or less. Here, the skewness of the roughness curve is a quantitative expression of the vertical symmetry of the amplitude distribution curve with the average line as the center, and the skewness Rsk of the roughness curve on the background is −0.5 or more. If it is 0.2 or less, it has good vertical symmetry and is less affected by light, so the variation in color tone due to light is small, and the display surface exhibiting a glossy gold or silver color tone is more prominent. Therefore, a high-class feeling and aesthetic satisfaction can be given to the consumer.

Note that the skewness Rsk of the roughness curve on the background surface is also a stylus type surface roughness meter (for example, manufactured by AMETEK) in accordance with JIS B 0601-2001, as described above.
It can be determined by measuring using Talysurf S4C).

  The decorative member made of cermet of this embodiment is composed of a sintered body mainly composed of titanium carbide, titanium nitride, titanium carbonitride, etc., and plays a role of bonding hard crystals composed of the main component in addition to the main component. , Nickel, niobium, chromium, molybdenum, tungsten, cobalt and the like.

In addition, what is necessary is just to measure the compound of a main component using an X-ray-diffraction apparatus (XRD, for example, BrukerAXS company make: D8 ADVANCE), about the presence of other components, a scanning electron microscope (S
EM) and can be confirmed by using the attached EDS.

Next, the variation in color tone on the background can be confirmed by the following method. For the measurement, a spectrocolorimeter (former Minolta Co., Ltd. CR-221 or its successor model) is used, and in accordance with JIS Z 8722-2000, the lightness index L * (in the CIE 1976 L * a * b * color space) Hereinafter, the value of the chromaticness index a * (hereinafter sometimes simply referred to as a *) and the chromaticness index b * (hereinafter simply referred to as b *) may be simply described as L *. Find the value of. As the measurement conditions, the light source may be CIE standard light source D65, the illumination light receiving method may be set to condition a ((45-n) [45-0]), and the measurement diameter may be set to 3 mm.

Then, at least three locations on the background are measured, and ΔE = ((ΔL *) ² + (Δa *) ² + (Δb *) is obtained using the obtained values of L *, a *, and b *. ² ) Variation in color tone can be obtained by ^1/2 .

  Here, L * is an index of lightness indicating the lightness and darkness of the color tone. When the value of L * is large, it is a bright color tone, and when the value of L * is small, it is a dark color tone.

  Moreover, a * is an index indicating the degree of red to green color tone, and if the value of a * is a large value on the plus side, it is a red color tone, and the value of a * is on the minus side. A large value means a greenish tone.

  Also, b * is an index indicating the degree of yellow to blue in the color tone. If the value of b * is a large value on the plus side, it is a yellowish tone, and the value of b * is on the minus side. A large value means a blue color tone.

  Furthermore, since the absolute values of a * and b * are also indices indicating the vividness of the color tone, when the a * and b * absolute values are small, the astringent color tone is suppressed with vividness.

  The cermet decorative member of this embodiment has a ΔE value of 0.25 to 0.35 on the background and a small variation in color tone, so that the display surface exhibits a glossy gold or silver color tone. Is more conspicuous, so that the consumer can be given a high-class feeling and aesthetic satisfaction. Note that the value of ΔE on the display surface is, for example, about 0.2. In addition, the ΔE value of the surface subjected to blasting with glass generally used as blasting abrasive grains is about 1.4, and the background color in the decorative member made of cermet according to the present embodiment is adjusted in color tone. It can be seen whether the variation is small.

  The decorative member made of cermet according to the present embodiment has a decorative face plate, car emblem, etc. in addition to the clock face dial, portable terminal key and ring shown in FIGS. It can be suitably used for components that require value.

  Next, an example of the manufacturing method of the cermet decorative member of this embodiment will be described.

  First, titanium carbide, titanium nitride, titanium carbonitride, etc. are the main components, and in addition to the main components, at least nickel, niobium, chromium, molybdenum, tungsten, cobalt, etc. A sintered body containing any of them is prepared. In addition, a main component is a component which occupies 70 mass% or more among 100 mass% of all the components which comprise a sintered compact.

  The surface of the sintered body is lapped while supplying diamond abrasive grains having an average particle diameter of 1 μm or less using, for example, a tin lapping machine, and the arithmetic average roughness Ra on the surface is 0.03 μm. The following.

Next, masking is performed at a position where characters or the like are to be displayed, and blast processing is performed. At this time, boron carbide (B ₄ C) is used as abrasive grains for blasting. The polishing allowance by blasting is 0.1 to 0.5 mm. By using B ₄ C having high hardness as abrasive grains for blasting, a background surface having characteristic surface properties can be formed. .

The arithmetic average roughness Ra on the background is 0.35 μm or more and 0.65 μm or less, and the ratio of the maximum peak height Rp of the roughness curve on the background and the maximum valley depth Rv of the roughness curve is In order to set a certain Rp / Rv to 0.5 or more and 1.5 or less, B ₄ C can be used for the abrasive grains, and can be adjusted by the size of the abrasive grains, the projection time, and the projection pressure.

  Finally, the cermet decorative member of the present embodiment can be obtained by removing the mask. The surface from which the mask has been removed is the display surface, and the blasted surface is the background surface.

  Also, in order for the skewness Rsk of the roughness curve on the background surface to be −0.5 or more and 0.2 or less, the size of the abrasive grains is # 280 to 360, the projection time is 18 to 22 minutes, and the projection pressure is 0. .14 to 0.16 MPa.

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

  Samples with different blasting conditions were prepared, and variations in color tone on the background were confirmed.

  First, titanium carbide, titanium nitride, titanium carbonitride, etc. are the main components, and in addition to the main components, at least nickel, niobium, chromium, molybdenum, tungsten, cobalt, etc. A sintered body containing either of them was prepared.

  Then, the surface of the sintered body is lapped while supplying diamond abrasive grains having an average particle diameter of 1 μm or less using a tin lapping machine, and the arithmetic average roughness Ra on the surface is 0.03 μm or less. did.

  Next, a mask was applied to a position where characters or the like were to be displayed, and blasting was performed using blasting abrasive grains shown in Table 1. Finally, each sample was obtained by removing the mask.

As the blasting conditions, for samples with _{B 4} C, # abrasive grain size 240-400, 15-25 minutes projection time, the projection pressure was 0.12～0.18MPa. And, for glass, one sample is used, and for B ₄ C, a plurality of sintered bodies are used, the size of the abrasive grains in the above-mentioned range, the projection time, and the projection pressure are variously changed to produce a sample. Table 1 shows the numerical ranges obtained for arithmetic average roughness Ra, Rp / Rv, and color tone variation on the surface. Moreover, the sample which used glass as an abrasive grain as a comparative example was produced.

And as a measuring method of arithmetic mean roughness Ra in a back ground surface, the back ground surface in each sample is used as a measuring surface, and a stylus type surface roughness meter (Talysurf manufactured by AMETEK Co., Ltd.) according to JIS B 0601-2001. S4C), the measurement length was 4 mm, the cutoff value was 0.8 mm, the stylus tip radius was 2 μm, and the stylus scanning speed was 1 mm / sec.

Further, for Rp / Rv, the measurement was performed under the same conditions as described above for each direction of the background of each sample. Next, the measurement was performed in the same manner in the direction orthogonal to the previously measured direction. Accordingly, the maximum peak height Rp of the roughness curve in one direction and the maximum valley depth Rv of the roughness curve, and the maximum peak height Rp of the roughness curve and the maximum valley depth of the roughness curve in a direction orthogonal to the one direction. Rv was obtained. Then, the respective average values are set as the values of the maximum peak height Rp of the roughness curve and the maximum valley depth Rv of the roughness curve on the background, and these values are used to determine the maximum peak height Rp of the roughness curve. Rp / Rv was calculated by dividing the value by the value of the maximum valley depth Rv of the roughness curve.

  Furthermore, regarding the variation in color tone on the background, a spectrocolorimeter (formerly Minolta Co., Ltd. CR-221) is used, and the brightness in the CIE 1976 L * a * b * color space according to JIS Z 8722-2000. The values of the index L *, the chromaticness index a * and the chromaticness index b * are obtained. As the measurement conditions, the light source was CIE standard light source D65, the illumination light receiving method was set to condition a ((45-n) [45-0]), and the measurement diameter was set to 3 mm.

Then, at least three locations on the background are measured, and ΔE = ((ΔL *) ² + (Δa *) ² + (Δb *) is obtained using the obtained values of L *, a *, and b *. ² ) The variation in color tone was determined by ^1/2 .

  In addition, each sample was visually confirmed, and in contrast, ◎ was marked on the display surface and ◯ on one side. The results are shown in Table 1.

  From the results of Table 1, the arithmetic average roughness Ra on the display surface is 0.03 μm or less, the arithmetic average roughness Ra on the background surface is 0.35 μm or more and 0.65 μm or less, and Rp / Rv is 0.5. It was found that when the ratio is 1.5 or less, the glossy display surface stands out and gives a consumer a sense of luxury and high aesthetic satisfaction.

Moreover, when the skewness Rsk of the roughness curve on the background surface was measured for a sample with a more prominent display surface among samples prepared using B ₄ C, the value of the skewness Rsk was −0.5 or more and 0. .2 or less. As a result, since the skewness Rsk value is −0.5 or more and 0.2 or less, it is not easily affected by light, so that the glossy display surface further stands out, and a higher sense of quality and aesthetic satisfaction are given to consumers. I understood that it was given.

1: Dial 2: Key 3: Ring

Claims (5)

  The decorative surface is a cermet decorative member having a display surface and a background surface, the arithmetic average roughness Ra on the display surface is 0.03 μm or less, and the arithmetic average roughness Ra on the background surface is 0.00. Rp / Rv, which is a ratio between the maximum peak height Rp of the roughness curve on the background surface and the maximum valley depth Rv of the roughness curve, is 0.5 or more and 1.5 or less. A decorative member made of cermet, characterized in that   2. The cermet decorative member according to claim 1, wherein a skewness Rsk of a roughness curve on the background surface is −0.5 or more and 0.2 or less.   A timepiece using the decorative member made of cermet according to claim 1.   A portable terminal using the cermet decorative member according to claim 1.   A clothing accessory comprising the cermet decorative member according to claim 1.