| 摘要 |
PURPOSE:To produce composite noble metal alloy products excellent in various characteristics by mixing powder of noble metals coated with Ni on the surface, specific metal powder and binder, molding the mixture to ornamental articles, sintering the articles and subjecting the articles to specific post treatments and working. CONSTITUTION:The surface of the powder of noble metals such as Au, Au alloy, Pt, Pd, Rh and others is subjected to electroless plating of Ni to prepare Ni powder 2. Said powder is mixed with the powder 4 of Ti, Al, or the alloy thereof and a binder 5 such as olefin resin to form the injection molding powder 6. This powder 6 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 surfaces of the sintered moldings 15 obtd. in such a manner are subjected to Au plating 16a and thereafter, the plated surfaces are subjected to a polishing treatment, etc. to expose 17 the metals of the Ti and Al on the plated surfaces. Further, the Ti- and Al-exposed surfaces are subjected to a color formation treatment 18 by anodic oxidation, oxidation by heating, etc. The ornamental goods made of the composite noble metal alloy to which the Ti and Al and the noble metals are securely bonded and which are resistant to cracking are thus easily produced.
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