JPWO2016136894A1 - Cermet decorative member, watch, portable terminal and accessory using the same - Google Patents

Abstract

The decorative member made of cermet according to the present disclosure includes a cermet including a crystal phase made of titanium carbonitride and a binder phase made of metal, and the binder phase contains nickel as a main component and at least niobium and chromium. The lattice constant is 3.54 mm or more. Moreover, the timepiece, the portable terminal, or the accessory of the present disclosure uses the cermet decorative member configured as described above.

Description

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

  Conventionally, gold, its alloys, or various metals plated from the viewpoint of color tone and corrosion resistance have been used for decorative items exhibiting gold color. However, since gold, its alloys, or plated metal materials all have low hardness, there is a problem that the surface is scratched or deformed due to contact with a hard substance.

  In order to solve such problems and respond to diversification of preferences, the applicant of the present application has proposed various decorative members made of cermet that exhibit gold color.

  For example, in International Publication No. 2009/069549 (Patent Document 1), a ceramic for decorative parts made of a titanium nitride-based sintered body containing titanium nitride as a main component, including nickel, niobium, chromium and carbon, A cermet decorative member containing carbon in a content of 0.5% by mass to 0.9% by mass is proposed.

  Further, in International Publication No. 2009/145146 (Patent Document 2), it is a ceramic for decorative parts made of a titanium nitride sintered body, and includes nickel, niobium, chromium and carbon, and the carbon is contained in an amount of 1% by mass or more. A cermet decorative member containing 2% by mass or less is proposed.

  The decorative member made of cermet according to the present disclosure includes a cermet including a crystal phase made of titanium carbonitride and a binder phase made of metal, and the binder phase contains nickel as a main component and at least niobium and chromium. Has a lattice constant of 3.54 mm or more.

  The timepiece, the portable terminal or the accessory of the present disclosure uses the cermet decorative member having the above configuration.

A watch case is shown as an example of a cermet decorative member of the present embodiment, (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. It is a schematic diagram which shows an example of a structure of the timepiece band as an example of the decorative member made from cermet of this embodiment.

  In recent years, a cermet decorative member is required to reduce color variation in order to give a consumer a higher quality and high aesthetic satisfaction.

  Hereinafter, an example of the decorative member made of cermet according to the present embodiment will be described.

  The cermet decorative member of the present embodiment is made of cermet including a crystal phase made of titanium carbonitride and a binder phase made of metal. The binder phase contains nickel as a main component and at least niobium and chromium, and the lattice constant of nickel is 3.54% or more. Here, the main component in the binder phase is a component that exceeds 50% by mass of 100% by mass of the components constituting the binder phase.

  The cermet decorative member of the present embodiment satisfies the above-described configuration, thereby exhibiting a golden color tone with little color variation. Here, the lattice constant of the single crystal of nickel is 3.5238 mm, whereas the lattice constant of nickel in the decorative member made of cermet of this embodiment is 3.54 mm or more. The cermet decorative member according to the present embodiment exhibits a golden color tone with little color variation. Niobium and / or chromium is dissolved in nickel, which is a main component of the binder phase, which has a high ionization tendency. This is presumably because the nickel ionization tendency is reduced. In particular, it is presumed that the effect due to the solid solution of niobium is large.

  And the lattice constant of nickel in the decorative member made from cermet of this embodiment can be known by measuring using an X-ray diffractometer (XRD, for example, BrukerAXS company make: D8 ADVANCE).

  Moreover, the decorative member made from cermet of this embodiment is 7.0-11.0 mass% of nickel, 1.5-6.0 mass% of niobium among 100 mass% of all the components which comprise a cermet, Chromium is 1.0 to 5.0 mass%, and the balance is titanium carbonitride. More preferably, nickel is 8.0 to 10.0 mass%, niobium is 2.5 to 5.0 mass%, and chromium is 2.0 to 4.0 mass%. Note that whether or not the cermet decorative member of the present embodiment contains titanium carbonitride can be confirmed by measuring and identifying with XRD. Further, the presence of nickel, niobium, and chromium can be confirmed by observing with a scanning electron microscope (SEM) and using an EDS attached to the SEM for portions other than the crystal phase.

  The contents of nickel, niobium and chromium can be determined by measuring using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer (ICP) or a fluorescent X-ray analyzer (XRF). In addition, about content of titanium carbonitride, what is necessary is just to let the value which deducted the sum total of content of nickel, niobium, and chromium from 100 mass% be content of titanium carbonitride. The content of titanium carbonitride can also be determined by measuring Ti with ICP or XRF and adding the results of measuring carbon with a carbon analyzer and nitrogen with a nitrogen analyzer.

  Moreover, it can be confirmed whether it is a main component from content of nickel and total content of nickel, niobium, and chromium.

  Next, the color variation can be confirmed by the following method. First, in the measurement, the sample is lapped so that the arithmetic average roughness Ra in the roughness curve is 0.03 μm or less. For the measurement, a spectrocolorimeter (Konica Minolta Co., Ltd. CM-5 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 sometimes simply referred to as L *) value, chromaticness index a * (hereinafter simply referred to as a *) and chromaticness index b * (hereinafter simply referred to as b *) Find the value of this). Measurement conditions are SCI (including specularly reflected light), light source is CIE standard light source D65, illumination light receiving method is di: 8 °, de: 8 ° (diffuse illumination, 8 ° direction light reception), and measurement diameter is set to 3 mm. You can do that.

Then, in a single cermet decorative member, measurement is performed at at least three locations, and ΔE = ((ΔL *) ² + (Δa *) ² + is obtained using the obtained values of L *, a *, and b *. The color variation can be obtained by (Δb *) ² ) ^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.

  In the cermet decorative member of the present embodiment, when the lattice constant of the crystal phase of titanium carbonitride is 4.27 to 4.30, L * is 64 to 68, a * is 1 to 4; b * is 1 or more and 5 or less, and a purple-colored golden color tone can be exhibited.

  In the cermet decorative member of the present embodiment, when the cermet contains at least one of molybdenum, tungsten, and cobalt, these act as a sintering aid to lower the firing temperature. Therefore, it is possible to suppress a decrease in shape workability due to abnormal grain growth of titanium carbonitride crystals.

  Needless to say, it may contain all of molybdenum, tungsten and cobalt, and suitable content is, for example, that the content of molybdenum is 0.5% in 100% by mass of all components constituting the cermet. Mass% or more and 2.0 mass% or less, tungsten content is 0.05 mass% or more and 0.4 mass% or less, and cobalt content is 0.02 mass% or more and 0.2 mass% or less. is there. Preferably, the total content of molybdenum, tungsten and cobalt is 2% by mass or less.

  The content of molybdenum, tungsten and cobalt in 100% by mass of all components constituting the cermet may be measured using ICP or XRF.

  Further, in the decorative member made of cermet of the present embodiment, when the oxygen content is less than 1.0% by mass in 100% by mass of all the components constituting the cermet, the oxidation of the binder phase is small. Therefore, the color variation can be further reduced. Further, when the oxygen content is less than 1.0% by mass, there is little oxidation of the binder phase, that is, nickel, niobium, chromium, and the like are present as metals, so Play a role. In addition, oxygen content can be calculated | required by measuring with an oxygen analyzer (for example, TCH-600 by LECO).

  Moreover, in the decorative member made of cermet of the present embodiment, when the content of free carbon is 1.5% by mass or more and 2.5% by mass or less in 100% by mass of all the components constituting the cermet, Shape processing time for obtaining a desired shape can be shortened while having mechanical characteristics. In addition, content of free carbon can be calculated | required by measuring with a carbon analyzer (for example, RC-612 by LECO).

  Further, the cermet decorative member of the present embodiment may include a compound composed of nickel and chromium. Thus, when a compound composed of nickel and chromium is present, nickel and chromium are magnetic materials, whereas a compound composed of nickel and chromium is a non-magnetic material. Even if it is used for a timepiece, a portable terminal, etc., the influence of magnetism becomes difficult.

  Here, the presence of the compound consisting of nickel and chromium can be confirmed by measuring and identifying by XRD. The compound composed of nickel and chromium is a compound represented by CrNi. Is 01-071-7594.

  The cermet decorative member of this embodiment has a three-point bending strength of 1000 MPa or more and has practically sufficient mechanical properties. The three-point bending strength may be measured according to JIS R 1601-2008.

  Next, a specific example of the cermet decorative member of this embodiment will be described.

  1A and 1B show a watch case as an example of a cermet decorative member of the present embodiment. FIG. 1A is a perspective view seen from the front side, and FIG. 1B is a perspective view seen from the back side. FIG. 2 is a schematic diagram showing an example of the configuration of a watch band as an example of a cermet decorative member of the present embodiment.

  A watch case 10 shown in FIGS. 1A and 1B fixes a recess 11 for housing a movement (drive mechanism) (not shown) and the like and a watch band (not shown) for mounting the watch on an arm. And a foot 12. The concave portion 11 includes a thin bottom portion 13 and a thick trunk portion 14.

  The band piece constituting the watch band 50 shown in FIG. 2 has a middle piece 20 having a through hole 21 into which the pin 40 is inserted, and a pin hole 31 into which the both ends of the pin 40 are inserted. And an outer piece 30 having 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, so that the middle piece 20 and the outer piece 30 are sequentially connected to each other. A band 50 is configured.

  Since the band pieces constituting the watch case 10 and the watch band 50 are made of the cermet decorative member according to the present embodiment, they exhibit a golden color tone with little color variation. Can give a sense of quality and high aesthetic satisfaction to the user. Needless to say, even in a timepiece using the cermet decorative member of the present embodiment such as the band piece constituting the timepiece case 10 and the timepiece band 50, it can give a luxury and high aesthetic satisfaction to the consumer. it can. Note that the cermet decorative member of this embodiment can also be used for a clock hand or dial.

  Further, the cermet decorative member of the present embodiment can be suitably used for a housing of a mobile terminal, various operation keys, and the like. And a consumer who owns a portable terminal using the cermet decorative member of the present embodiment can be given a sense of luxury and high aesthetic satisfaction. Note that the portable terminal means a portable information terminal including a cellular phone, a portable car navigation system, an audio player, and the like.

  Furthermore, the cermet decorative member of the present embodiment can be suitably used for rings, earrings, necklaces, etc., and even for consumers who own jewelry that uses the cermet decorative member of the present embodiment, High aesthetic satisfaction can be given.

  Note that the cermet decorative member of the present embodiment is not limited to those described above, and can be suitably used for parts that require decorative value, such as amenity goods and car emblems.

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

  First, titanium nitride powder having an average particle size of 10 to 30 μm, titanium carbide powder having an average particle size of 0.5 to 3.0 μm, nickel powder having an average particle size of 15 to 25 μm, and an average particle size of 10 to 10 μm. A predetermined amount of niobium powder having a diameter of 20 μm and chromium powder having an average particle diameter of 30 to 50 μm is weighed.

  Specifically, nickel powder is 7.0 to 11.0% by mass, niobium powder is 1.5 to 6.0% by mass, chromium powder is 1.0 to 5.0% by mass, and the balance is titanium nitride. Powder and titanium carbide powder are used as starting materials. The ratio of the titanium nitride powder to the titanium carbide powder is preferably weighed to be 6.5: 3.5 to 3: 7, more preferably 6: 4 to 4: 6. .

  Of the starting materials, first, nickel powder, niobium powder, chromium powder, and water or methanol as a solvent are put in a mill and mixed and ground (primary mixing and grinding). In this way, niobium and / or chromium can be dissolved in nickel by pulverizing with only metal powder for 10 hours or more and allowing niobium powder and chromium powder to be present around the nickel powder. When the primary mixing / pulverization time exceeds 30 hours, the solid solution accelerating effect does not change. Therefore, for the purpose of promoting the solid solution, the primary mixing / pulverization time is preferably 30 hours or less.

  When the cermet contains at least one of molybdenum, tungsten, and cobalt, molybdenum powder, tungsten powder, and cobalt powder may be prepared and added during the primary mixing / pulverization. Moreover, in order to make the compound which consists of nickel and chromium exist in a cermet, what is necessary is just to make the time of primary mixing and grinding | pulverization into 30 hours or more.

  Then, after the primary mixing and pulverization, the titanium nitride powder and the titanium carbide powder are put into a mill and subjected to secondary mixing and pulverization, and then a predetermined amount of a binder is added to obtain a slurry.

  Next, the obtained slurry is spray-dried into granules, and the granules are used to form a circle by a desired molding method, for example, a dry pressure molding method, a cold isostatic pressing method, an extrusion molding method, or the like. It is formed into a desired shape such as a plate, flat plate, or torus. If the desired shape is complicated, an injection molding method may be used as the molding method.

  Next, the compact is put in a pressure degreasing furnace, and degreasing is performed in an inert gas atmosphere at a temperature of 310 to 390 ° C. and a pressure of 30 to 60 kPa. Then, a sintered body can be obtained by firing at a temperature of 1200 to 1500 ° C. in a vacuum of 1.33 Pa or less. In addition, in order to make oxygen content less than 1.0 mass% among 100 mass% of all the components which comprise a cermet, it hold | maintains at 400-600 degreeC for 50 minutes or more at the time of the temperature rise of baking, and then 1200-200 It may be fired at a temperature of 1500 ° C. Thus, by holding at 400 to 600 ° C. for 50 minutes or more at the time of temperature rise, oxygen and carbon remaining in the degreased body react to become carbon dioxide gas and escape from the degreased body. The content can be less than 1.0% by mass. Moreover, in order to make free carbon content 1.5 mass% or more and 2.5 mass% or less among 100 mass% of all the components which comprise a cermet, what is necessary is just to adjust degreasing conditions in degreasing conditions, for example, When the temperature is 350 ° C. and the pressure is 45 kPa, the holding time may be 10 to 20 minutes.

  Next, for example, a lapping process is performed using a tin lapping machine while supplying diamond abrasive grains having an average particle diameter of 1 μm or less, and then barrel polishing is performed. In addition, as barrel polishing, in a wet process, green carborundum (GC) may be used as a medium and rotated for 24 hours with a rotating barrel polishing machine.

  The cermet decorative member of the present embodiment obtained as described above has a crystal phase made of titanium carbonitride and a binder phase containing nickel, niobium and chromium, and the nickel lattice constant is 3.54 mm or more. It is possible to exhibit a golden color tone with little color variation. In addition, the watch, the portable terminal and the accessory using the cermet decorative member of the present embodiment have sufficient mechanical strength for practical use, and give consumers a sense of quality and high aesthetic satisfaction. be able to.

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

  First, titanium nitride powder having an average particle size of 20 μm, titanium carbide powder having an average particle size of 1.0 μm, nickel powder having an average particle size of 20 μm, niobium powder having an average particle size of 15 μm, and an average particle size of Using a 40 μm chromium powder, the cermet was weighed so that the nickel content was 10 mass%, the niobium content was 5.0 mass%, and the chromium content was 3 mass%. The ratio of titanium nitride powder to titanium carbide powder was 6: 4.

  Then, nickel powder, niobium powder, chromium powder, and water or methanol as a solvent were placed in a mill and subjected to primary mixing and pulverization at the times shown in Table 1.

  Next, the titanium nitride powder and the titanium carbide powder were put into a mill, subjected to secondary mixing and pulverization, and then a predetermined amount of binder was added to obtain a slurry. Sample No. For 1, primary mixing and pulverization are not performed, and only secondary mixing and pulverization are performed.

  Next, the obtained slurry was spray-dried to form granules, and a molded body was obtained by using this granule by a dry pressure molding method.

  Next, the compact is put into a pressure degreasing furnace and degreased while maintaining a temperature of 350 ° C. and a pressure of 45 kPa in an inert gas atmosphere, and then a temperature of 1500 ° C. in a vacuum of 1.33 Pa or less. Was sintered to obtain a sintered body.

  Each sample was measured using XRD (manufactured by BrukerAXS: D8 ADVANCE) to confirm the presence of the crystalline phase of titanium carbonitride. Sample No. Regarding 1, the presence of a crystal phase of titanium nitride was also confirmed. Further, the lattice constant of nickel was confirmed by XRD.

  Further, when each sample was measured using ICP, it was confirmed that nickel, niobium and chromium had the contents as expected at the time of weighing.

  Next, for each sample, lapping was performed using a tin lapping machine while supplying diamond abrasive grains having an average particle diameter of 1 μm or less, and the arithmetic average roughness Ra in the roughness curve was 0.03 μm or less. A lapping surface was used. Then, using a spectrocolorimeter (Konica Minolta Co., Ltd. CM-5), in accordance with JIS Z 8722-2000, the lightness index L * in the CIE 1976 L * a * b * color space at three locations for each sample. , Chromaticness index a * and chromaticness index b *. Measurement conditions are SCI (including specularly reflected light), the light source is CIE standard light source D65, the illumination light receiving method is di: 8 ° · de: 8 ° (diffuse illumination, 8 ° direction light reception), and the measurement diameter is 3 mm. It was done by setting.

  Then, using the obtained values of L *, a *, and b *, ΔE = ((ΔL *)²+ (Δa *) ²+ (Δb *)²)^1/2Thus, the color variation was obtained. The results are shown in Table 1.

  From Table 1, Sample No. 3 to 6 are sample Nos. A result of a smaller ΔE value than 1 and 2 was obtained, and in a cermet having a crystal phase composed of titanium carbonitride and a binder phase containing nickel, niobium and chromium, the lattice constant of nickel is 3.54Å or more. As a result, it was found that a golden color tone with little color variation was exhibited.

  Cermets having the compositions shown in Table 2 were prepared, and monitor evaluation was performed along with measurement of color tone. In addition, as a manufacturing method, sample No. of Example 1 except having weighed so that it might become a composition shown in Table 2. 4 was produced in the same manner as when 4 was produced. Sample No. Sample No. 8 4 is a sample under the same conditions.

  Each sample was measured using XRD (manufactured by BrukerAXS: D8 ADVANCE) to confirm the presence of the crystalline phase of titanium carbonitride. Moreover, the lattice constant of titanium carbonitride was confirmed. Furthermore, about each sample, it measured using ICP and calculated | required content of nickel, niobium, and chromium.

  Next, by processing and measuring in the same manner as in Example 1, the values of the lightness index L *, the chromaticness index a *, and the chromaticness index b * in the CIE 1976 L * a * b * color space of each sample were determined. The value was determined.

  A questionnaire survey was conducted on two samples of high quality and aesthetic satisfaction for each sample on a total of 40 monitors of 5 men and women of each age group in their 20s to 50s who were interested in purple gold. In addition, the case where the ratio of those who answered “feel” in both two items was 80% or more was evaluated as “A”, and one item was evaluated as “B”. The results are shown in Table 2.

  From Table 2, Sample No. Nos. 8 to 10 have good monitor evaluation, and the lattice constant of the crystal phase composed of titanium carbonitride is 4.27 to 4.30 to indicate that the lightness index in the CIE 1976 L * a * b * color space L * was 64 or more and 68 or less, a * was 1 or more and 4 or less, and b * was 1 or more and 5 or less, and it was found that the decorativeness was high.

  A molybdenum powder, a tungsten powder and a cobalt powder were prepared. In the starting material composition in No. 4, a sample was prepared by reducing the titanium carbide powder by 1 mass% and adding molybdenum powder, tungsten powder or cobalt powder to that extent. For samples other than the starting material composition, the sample No. The same method as in No. 4 was performed. For comparison, the sample No. 4 was also prepared.

  And the relative density of the obtained sample was confirmed. In addition, relative density calculated | required by calculating | requiring the apparent density of a titanium nitride sintered body based on JISR1634-1998, and remove | dividing this apparent density by the theoretical density of a titanium nitride sintered body. As a result, samples to which molybdenum powder, tungsten powder, or cobalt powder was added respectively were sample Nos. The relative density was higher than 4, and it was found that the firing temperature could be lowered by including at least one of molybdenum, tungsten and cobalt in the titanium nitride sintered body. Further, it was found that the reduction in shape workability due to abnormal grain growth of titanium carbonitride can be suppressed by reducing the firing temperature.

  Samples with different holding times at 400 to 600 ° C. at the time of firing were prepared, and color variations were confirmed. First, the manufacturing method other than the holding time is the same as the sample No. 1 of Example 1. As in the case of No. 4, one sample had a holding time at 400 to 600 ° C. at the time of firing temperature of 25 minutes, and the other sample had 50 minutes.

  As a result of measuring the oxygen content with an oxygen analyzer (TCH-600 manufactured by LECO), the oxygen content in one sample was 2% and ΔE was 0.2. On the other hand, the oxygen content in the other sample was 0.9%, and ΔE was 0.15. As a result, it was found that the color variation can be further reduced when the oxygen content is less than 1.0% by mass in 100% by mass of all components constituting the cermet.

  Sample No. of Example 1 except that the holding time in degreasing during firing was varied. In the same manner as in No. 4, sample no. 12-16 were obtained. Sample No. 14 is Sample No. 4 is a sample under the same conditions.

  Next, each sample was pulverized and measured using a carbon analyzer (LE-CO RC-612) to determine the free carbon content. This content was obtained from a calibration curve prepared using a standard sample (calcium carbonate). For the validity of the calibration curve, measure silicon carbide powder whose free carbon content is known. Confirmed by

And grinding resistance was confirmed using each sample. A surface grinder (SGE-515E2T made by Nagase Integrex) equipped with a wheel (SDC400N75B25-5 made by Asahi Diamond Industrial Co., Ltd.) was used as the apparatus. In addition, the processing conditions were a rotation speed of 2000 min ⁻¹ , a cutting amount of 0.005 mm / pass, a grinding amount of 1200 V (mm ³ ), and a grinding resistance after 200 pass using a fixed dynamometer (9257B manufactured by Kistler). As an evaluation of the ease of grinding and grinding, ranking was performed from the lowest grinding resistance value. Before processing in each sample, a truing block made of copper was used, and truing dressing was performed under the conditions of a rotational speed of 1500 min ⁻¹ and a cutting depth of 0.005 mm / pass.

  Moreover, the test piece based on JISR1601-2008 was produced on the same conditions when producing each sample, the 3 point | piece bending strength was measured, and the ranking from the higher one was performed.

  The results are shown in Table 3.

  From Table 3, among 100 mass% of all components constituting the cermet, the content of free carbon is 1.5 mass% or more and 2.5 mass% or less, while having mechanical characteristics as a decorative member. It has been found that the shape processing time for obtaining the desired shape can be shortened.

10: watch case 11: recess 12: foot 13: bottom 14: trunk 20: middle piece 21: through hole 30: outer piece 31: pin hole 40: pin 50: watch band

Claims (9)

It consists of a cermet containing a crystal phase made of titanium carbonitride and a binder phase made of metal,
The binder phase is a cermet decorative member containing nickel as a main component and at least niobium and chromium, wherein the nickel has a lattice constant of 3.54 mm or more.   The cermet decorative member according to claim 1, wherein a lattice constant of the crystal phase is 4.27 to 4.30.   The cermet decorative member according to claim 1 or 2, wherein the cermet contains at least one of molybdenum, tungsten, and cobalt.   The decorative member made of cermet according to any one of claims 1 to 3, wherein the content of oxygen is less than 1.0% by mass among 100% by mass of all components constituting the cermet.   The cermet decorative member according to any one of claims 1 to 4, wherein a content of free carbon is 100% by mass or more and 2.5% by mass or less of 100% by mass of all components constituting the cermet. .   The decorative member made of cermet according to any one of claims 1 to 5, wherein a compound composed of nickel and chromium is present in the cermet.   A timepiece using the cermet decorative member according to any one of claims 1 to 6.   A portable terminal using the cermet decorative member according to any one of claims 1 to 6.   A jewelry comprising the cermet decorative member according to any one of claims 1 to 6.

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