Ceramic for decorative parts and decorative parts made by using the ceramic

A technology for decorative parts and ceramics, applied in the field of decorative parts, can solve the problems of low mechanical properties and large chromatic aberration of decorative parts, and achieve the effects of high mechanical properties, reduced chromatic aberration, and small chromatic aberration

Inactive Publication Date: 2010-10-27
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Also, in Patent Documents 2 and 3, although TiO, ZrN, HfN, VN, NbN, TaN, CrN, Cr 2 N, TaC, and NbC show a deep light golden yellow to bright golden yellow color tone, but the sintered alloys (ceramics for decorative parts) described in the description have mechanical properties such as hardness and toughness, or behavior between decorative parts. The ratio of carbon that affects the color difference of color tone deviation can take a wide range of values, so there are problems such as the appearance of decorative parts with low mechanical properties, or the occurrence of large color differences between decorative parts
[0025] Patent Document 4 describes ceramics for decorative parts that can provide a sense of luxury, aesthetic satisfaction, and mental well-being, and that exhibit a golden yellow color that has become very popular in the market recently. However, this ceramics for decorative parts is not carbon-controlled The ratio of ceramics may cause decorative parts with low mechanical properties, or the color difference between decorative parts may become large

Method used

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  • Ceramic for decorative parts and decorative parts made by using the ceramic
  • Ceramic for decorative parts and decorative parts made by using the ceramic
  • Ceramic for decorative parts and decorative parts made by using the ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] First, titanium nitride powder (purity 99%, average particle diameter 22.3 μm), nickel powder (purity 99.5%, average particle diameter 12.8 μm), niobium powder (purity 99.5%, average particle diameter 33 μm), chromium powder (purity 99%, average particle size 55 μm) and carbon powder (purity 99% or more, average particle size 0.5 μm), make the ratio (content) of these powders in the sintered body to the ratio shown in Table 1, then pulverize, Mix to make blending ingredients.

[0156] Next, an isopropanol solution was added to each of the obtained blended raw materials, and after pulverization and mixing for 72 hours using a vibratory pulverizer, 3 parts by mass of paraffin wax as a binder was added to the blended raw materials, and then dried by spray drying to obtain Make into granules. Then, the obtained pellets were press-molded under a pressure of 98 MPa to produce a compact. Next, the formed body was degreased at 600° C. in a nitrogen atmosphere, and then fired ...

Embodiment 2

[0173] A test was performed to confirm the change in properties due to the difference in the composition formula of the titanium nitride powder.

[0174] First, titanium nitride powder having the composition formula shown in Table 2 was prepared, and the same raw materials as in Example 1 were prepared for other raw materials. Next, these raw materials were weighed so that the ratio (content) in the sintered body became the ratio shown in Table 2, and then pulverized and mixed to prepare a blended raw material. Next, by the same manufacturing method as Example 1, the ceramics for decorative parts which consist of a titanium nitride sintered body of sample No. 24-No. 28 were obtained.

[0175] Then, the content of nickel, niobium, chromium, and carbon, the arithmetic mean height Ra, and the color tone were measured in the same manner as in Example 1, and opinion surveys were conducted on three items: high-quality feeling, aesthetic satisfaction, and mental well-being. In addit...

Embodiment 3

[0184] A test was performed to confirm the change in characteristics due to the difference in Ni and Nb contents.

[0185] First, titanium nitride powder used in sample No. 27 was prepared, and the same raw materials as in Example 1 were prepared for other raw materials. Next, these raw materials were weighed so that the ratio (content) in the sintered body became the ratio shown in Table 3, and then pulverized and mixed to prepare a blended raw material. Next, by the same manufacturing method as in Example 1, ceramics for decorative parts made of titanium nitride sintered bodies of sample No. 29 to No. 40 were obtained.

[0186] Then, the content of nickel, niobium, chromium, and carbon, the arithmetic mean height Ra, and the color tone were measured in the same manner as in Example 1, and opinion surveys were conducted on three items: high-quality feeling, aesthetic satisfaction, and mental well-being. In addition, using the sample No. 27 of Example 2, which answered "obtai...

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Abstract

A ceramic for decorative parts which has a golden color tone and can give a sense of luxuriousness, a feeling of aesthetic satisfaction, and spiritual serenity and which has excellent mechanical characteristics such as hardness and toughness and is reduced in color difference, more particularly, a ceramic for decorative parts comprising sintered titanium nitride which contains nickel, chromium, niobium and carbon with the carbon content falling within the range of 0.5 to 0.9mass%. In the ceramic, carbon diffuses into titanium nitride to form a solid solution, which accelerates the sintering. Therefore, the ceramic is improved in mechanical characteristics such as hardness and toughness and is reduced in color difference (delta E*ab), which indicates a difference in color tone, by virtue of suppression of color shading brought about by a slight tendency toward an achromatic color due to the black color of carbon. Thus, the invention provides a desirable golden ceramic for decorative parts whose color tone difference among decorative parts is insensible.

Description

technical field [0001] The present invention relates to a ceramic for decorative parts capable of producing a beautiful golden-yellow tone, and a decorative part using the same. Background technique [0002] Conventionally, gold or its alloys, or various metals with plating have been used for decorative parts for watches and accessories that appear golden in terms of color tone and corrosion resistance. [0003] However, regardless of whether it is gold or its alloy, or the metal material to be plated, since the hardness is very low, there is a problem of damage or deformation on the surface due to contact with hard substances. Recently, in order to solve such problems, various ceramics for decorative parts have been proposed. [0004] For example, Patent Document 1 describes that: 45 to 75% by weight of titanium nitride and 7.5 to 25% by weight of titanium carbide are contained as a hard phase (hard phase); Chromium accounts for 1 to 10% by weight of the total amount, mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/16C04B35/58C22C1/05
CPCC04B2235/5445C04B35/58014C04B35/58007C22C29/16C04B2235/422C04B2235/77C04B35/58035C04B35/58021C04B2235/9661C04B2235/404C04B35/58028C04B2235/5436C04B2235/3886C04B2235/405
Inventor 大田瑞穗村川俊一
Owner KYOCERA CORP
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