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Golden ornament and its manufacturing method

A manufacturing method and decoration technology, applied in metal material coating process, ion implantation plating, coating, etc., to achieve excellent adhesion, reduce usage, and maintain the effect of golden tone

Inactive Publication Date: 2008-04-09
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the gold coating layer has a different color tone from the titanium nitride layer and the gold layer or gold alloy layer, this part will be conspicuous if the surface is worn or scratched.

Method used

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  • Golden ornament and its manufacturing method
  • Golden ornament and its manufacturing method
  • Golden ornament and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107]Hereinafter, the present invention will be described by way of examples, but the present invention is not limited by these examples. In addition, the corrosion resistance test and the abrasion test in the examples were implemented by the following methods.

[0108] (1) Corrosion resistance test

[0109] The corrosion resistance test was performed in accordance with JIS H8502 (CASS test). The test time is 96 hours. When the rating value in the rating number standard chart is above 9.8, the corrosion resistance evaluation of the test surface is qualified.

[0110] (2) Abrasion test

[0111] As shown in FIG. 1 , the test piece 1 formed with the coating film is fixed on the opening of the test piece processing table 4 by using the test piece pressing plate 2 and the test piece pressing screw 3 , with the coating film forming surface facing downward. Next, stick grinding paper (not shown in the figure) on the grinding wheel 5 . An upward load is applied to the abrasive wh...

Embodiment 1

[0123] A polished watch case obtained by machining stainless steel (SUS316L) was cleaned and degreased with an organic solvent, and the base material was placed in an ion plating apparatus.

[0124] Next, after evacuating the inside of the apparatus to 1.3 mPa, argon gas was introduced to 0.13 Pa. In this argon atmosphere, plasma was generated by a plasma gun provided inside the apparatus, and then titanium was evaporated for 10 minutes to form a Ti coating film with a film thickness of 0.2 μm on the surface of the watch base material.

[0125] Next, titanium was evaporated under the same conditions as in the formation of the above-mentioned Ti coating film, while changing the introduced gas from argon to a mixed gas of nitrogen and argon. At this time, under the condition that the gas flow rate is kept constant at 300 sccm, the flow rate ratio of nitrogen gas to argon gas (N 2 / Ar) increased from 0 to 2.0 in 35 minutes. In this way, a TiN gradient coating film with a film t...

Embodiment 2

[0134] A polished watch case obtained by machining stainless steel (SUS316L) was cleaned and degreased with an organic solvent, and the base material was placed in an ion plating apparatus.

[0135] Next, after evacuating the inside of the apparatus to 1.3 mPa, argon gas was introduced to 0.13 Pa. In this argon atmosphere, plasma was generated by a plasma gun provided inside the apparatus, and then titanium was evaporated for 10 minutes to form a Ti coating film with a film thickness of 0.2 μm on the surface of the watch base material.

[0136] Next, titanium was evaporated under the same conditions as in the formation of the above-mentioned Ti coating film, while changing the introduced gas from argon to a mixed gas of nitrogen and argon. At this time, under the condition that the gas flow rate is kept constant at 300 sccm, the flow rate ratio of nitrogen gas to argon gas (N 2 / Ar) increased from 0 to 2.0 in 35 minutes. In this way, a TiN gradient coating film with a film t...

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Abstract

A golden ornament comprising a base material; a Ti coating whose Ti atom content is constant in the direction of coating thickness, formed on the base material in an atmosphere of inert gas other than nitrogen; a TiN gradient coating whose N atom content is sloped in the direction of coating thickness, formed on the Ti coating; a TiN coating whose Ti atom and N atom contents are constant in the direction of coating thickness, formed on the TiN gradient coating; an Au-TiN mixture gradient coating whose Au atom content is sloped in the direction of coating thickness, formed on the TiN coating; and an Au-TiN mixture coating whose Au atom, Ti atom and N atom contents are constant in the direction of coating thickness, formed on the Au-TiN mixture coating. Further, on this Au-TiN mixture coating, there may be formed an Au coating or Au alloy coating whose Au atom content is constant in the direction of coating thickness.

Description

technical field [0001] The present invention relates to a golden ornament and a manufacturing method thereof. Background technique [0002] Both the color tone as a decorative element and the wear resistance as a functional element are required for exterior decoration products such as watches and jewelry. Gold is most suitable for such a request, and has been used by directly processing the raw material or forming a gold-plated coating layer on other metals. When there is no special requirement for corrosion resistance, even a coating layer of 1 micron or less can be achieved in the sense of showing gold, but watch cases, bands, and jewelry require high resistance to sweat, water vapor, etc. , so the gold plating has a film thickness of at least 10 microns. [0003] However, since gold is a very expensive metal, there are limitations to exterior decorations that can employ a thick-film gold coating. Therefore, it is necessary to obtain a coating layer in which the amount ...

Claims

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Application Information

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IPC IPC(8): C23C14/06
Inventor 直井孝一田势文雄宫行男田中敦牛窪政義
Owner CITIZEN WATCH CO LTD
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