Metal treatment – Process of modifying or maintaining internal physical... – Treating loose metal powder – particle or flake
Patent
1996-01-30
1998-07-14
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Treating loose metal powder, particle or flake
75351, 75369, B22F 922
Patent
active
057798257
ABSTRACT:
The present invention relates to the methods for the manufacture of an electrode material applicable to special bonding of a metal of the light metal group or for spot resistance welding. The method of making an electrode material of Cu--Al.sub.2 O.sub.3 includes the steps of annealing Cu--Al alloy powder in a vacuum state, and generating pure Cu--Al alloy without oxide by reducing the annealed Cu--Al alloy powder in a hydrogen atmosphere at 400.degree..about.500.degree. C. A first oxidizing process oxidizes the surface of grains of the powder by heating the reduced Cu--Al alloy powder in an air or in an oxygen atmosphere at 400.degree..about.500.degree. C. In an internal oxidizing process, the Al in the Cu--Al alloy powder is internally oxidized by heating the surface-oxidized Cu--Al alloy powder in an inert gas atmosphere at 900.degree. C..about.1000.degree. C. to oxidize the powder grains internally, and further in a reduction process, reducing the internally oxidized Cu--Al.sub.2 O.sub.3 alloy powder in a hydrogen atmosphere.
REFERENCES:
patent: 4462845 (1984-07-01), Klar et al.
patent: 5405572 (1995-04-01), DeVolk
Korea Institute of Machinery & Materials
MacDonald Thomas S.
Wyszomierski George
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