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AssigneesCitizen Watch Co., Ltd., Toho Kinzoku Co., Ltd.
InventorsTakao Kasai, Naoto Ogasawara, Naoyoshi Akiyoshi, Takeo Hamada
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The method of the invention is concerned with the manufacture of a molded copper-chromium family metal based alloy article which involves the steps of injection-molding a mixture of copper powder, a chromium family metal powder, an iron family metal powder and a thermoplastic organic binder made up of a polymer binder and low molecular binder in a ratio by volume of 5:1 to 1:1, dewaxing a molded body formed by the injection-molding by heating in a reducing atmosphere, and then sintering the dewaxed molded body at 1,100.degree. to 1,450.degree. C. in a reducing atmosphere. According to this method, molded articles having a high dimensional accuracy and high density can be provided.
A method of manufacturing a molded copper-chromium family metal based alloy article which comprises injection-molding a mixture consisting essentially of copper powder, a chromium family metal powder, an iron family metal powder, phosphorous and a thermoplastic organic binder consisting essentially of a polymer binder and a low molecular binder in a ratio by volume of 5:1 to 1:1, dewaxing a molded body formed by the injection-molding by heating in a reducing atmosphere, and then sintering the dewaxed molded body at 1,100 to 1,450.degree. C. in a reducing atmosphere.
Dependencies are inferred from the claim text.