| 摘要 |
PURPOSE:To produce composite noble metal alloy products excellent in various characteristics by mixing powder of specific metals coated with Ni on the surface, noble metal powder and binder, molding the mixture to ornamental articles, sintering the articles and subjecting the articles further to noble metal plating, surface treatment and color forming treatment. CONSTITUTION:The surface of the powder of light metals such as pure Ti, Ti alloy or Al alloy is subjected to electroless plating of Ni to prepare Ni powder 2. Said powder is mixed at a proper ratio with the powder 4 of the noble metals such as Au and an olefin resin 5 as the binder to form the injection molding powder 6. Such powder mixture is made to injection moldings 8 such as rings and necklaces by an injection molding machine 9. The moldings are heated in a heating furnace 11 to evaporate away the binder to form the injection moldings 13 subjected to the removal of the binder. Such moldings are sintered in a heating furnace 11A and the sintered moldings 15 obtd. in such a manner are subjected to gold plating. The gold-plated moldings 17 are subjected to treatments such as dry honing and polishing to expose 19 the Ti, Al, etc.; thereafter, the moldings are subjected to color formation by a treatment 20 such as an anodizing treatment. The ornamental goods made of the composite noble metal alloy to which the Ti, Al, etc., and the noble metals such as Au are securely bonded and which are resistant to cracking are thus easily produced.
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