Specialized metallurgical processes – compositions for use therei – Processes – Producing or purifying free metal powder or producing or...
Patent
1994-12-20
1996-05-07
Sheehan, John
Specialized metallurgical processes, compositions for use therei
Processes
Producing or purifying free metal powder or producing or...
75371, B22F 100
Patent
active
055142028
ABSTRACT:
A method for producing fine silver-palladium alloy powder includes the steps of: (A) preparing separately a silver nitrate solution and a palladium nitrate solution and mixing the solutions, and then adding a neutralizing and complexing agent to the mixed solutions to adjust the pH thereof to about 2.5-3.5, whereby a first mixture containing silver and palladium ions is obtained; (B) preparing a second mixture containing a reductant and a surfactant; (C) bringing the first mixture into contact with the second mixture at a reaction temperature of 15.degree.-50.degree. C. under stirring in order to permit the silver and palladium ions to be reduced and to coprecipitate so as to form silver-palladium alloy particles; and (D) recovering the coprecipitated silver-palladium alloy particles, thereby obtaining the fine silver-palladium alloy powder.
REFERENCES:
patent: 3390981 (1968-07-01), Hoffman
patent: 4776883 (1988-10-01), Hayashi et al.
patent: 5292359 (1994-03-01), Jeng-Shyong et al.
patent: 5413617 (1995-05-01), Lin et al.
Deng Yung-Bao
Lee Sheng-Long
Lin Jing-Chie
National Science Council of R.O.C.
Sheehan John
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