Precious metal article, method for manufacturing same, moldable

Details Precious metal article, method for manufacturing same, moldable Precious metal article, method for manufacturing same, moldable

1994-04-22

1994-12-27

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 61, 75252, 75255, B22F 100

Patent

active

053763289

ABSTRACT:
There is disclosed a precious metal article which is formed of a solid-phase sintered product of a precious metal powder. For manufacturing the precious metal article, a moldable mixture which contains a precious metal powder and a binder removable by sintering is shaped into a prescribed molded object, and the molded object is then subjected to sintering. The moldable mixture is produced by preparing a precious metal powder, preparing a jellylike cellulose binder by blending a cellulose with water and leaving for a prescribed period of time, and blending the precious metal powder and the jellylike cellulose binder together. The most preferable moldable mixture contains 50 to 90% by weight of precious metal powder, 0.8 to 8% by weight of water-soluble cellulose binder, 0.08 to 3% by weight of a surface-active agent. 0.1 to 3% by weight of oil, balance water and unavoidable impurities. The precious metal powder preferably contains gold powder and powder of an alloy containing silver or copper, and the gold powder is obtained by submerged-reduction method.

REFERENCES:
patent: 3502446 (1968-02-01), Vickery
patent: 5080846 (1992-01-01), Kim et al.
patent: 5194203 (1993-03-01), Kankawa et al.
patent: 5238751 (1993-08-01), Van der Zel

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