Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Patent
1993-11-19
1995-04-25
Walsh, Donald P.
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
420469, B22F 100
Patent
active
054095204
ABSTRACT:
This invention is to offer a copper powder for solderable and conductive paints which have an improved solderability, excellent adhesion and conductivity.
A copper powder for solderable and conductive paints comprising particles of green caterpillar shape is obtained by crushing particulate dendritic copper powder, and has an oil absorption value (JIS K5101) of up to 20 ml/100 g, a maximum particle diameter of up to 44 .mu.m, an average particle diameter of up to 10 .mu.m, and a hydrogen-reduction loss of up to 0.5%. A process for producing this copper powder for solderable and conductive paints comprises: preparing a copper powder comprising particles of a green caterpillar shape having an average particle diameter of up to 10 .mu.m by crushing dendritic copper powder having a maximum diameter of up to 44 .mu.m by means of a crushing apparatus; treating the copper powders thus obtained with a pickling solution consisting of inorganic acids or organic acids to dissolve and remove any oxidation film on the copper powder surface; washing the copper powder with water; spraying a quick drying organic solvent on the copper powders; and hot-air drying the copper powder, thereby obtaining a copper powder having an oil absorption value of up to 20 ml/100 g and a hydrogen-reduction loss of up to 0.5%.
REFERENCES:
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patent: 4462845 (1984-07-01), Klar et al.
patent: 4663079 (1987-05-01), Yamaguchi et al.
patent: 4705647 (1987-11-01), Yamaguchi et al.
patent: 4921623 (1990-05-01), Yamaguchi et al.
Taubenblat, P. W., "Copper Base Powder Metallurgy", vol. 7, pp. 29-37.
Taubenblat, P. W., "Copper Base Powder Metallurgy", vol. 7, pp. 11-19, 1980.
Mori Seiji
Sannohe Kanetaro
Jenkins Daniel
Mitsui Kinzoku Kogyo Kabushiki Kaisha
Walsh Donald P.
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