Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1992-10-23
1994-10-04
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
75351, 419 38, 419 57, 420 41, 420 71, B22F 100, C22C 3860, C22C 3300
Patent
active
053524047
ABSTRACT:
A process for forming contact material of an electrode comprises the steps of preparing chromium of which oxygen content is substantially reduced, forming a molten mixture of the chromium and copper, atomizing the molten mixture into fine particles to obtain Cu-Cr alloyed powder, compacting Cu-Cr alloyed powder under desired pressure, and sintering the compacted alloyed powder. The oxygen content of the chromium may be reduced until less than 0.1 wt %. In a course of the process, a metal having melting point lower then copper may be blended. The metal may be blended in Cu-Cr alloyed powder, or blended in the molten mixture of copper and chromium. Alternatively, the process further includes the steps of forming a second molten mixture of copper and a metal having melting point lower than copper, atomizing the second molten mixture into fine particles to obtain alloyed powder of copper and the metal, and blending Cu-Cr alloyed powder with the alloyed powder of copper and the metal. The metal may be selected from one or mixture of the metals consisting of bismuth, lead, tellurium, antimony and selenium.
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World Patents Index-Derwent-Week 8241-An 82-86878 JP-A-57-143454-Sep. 4, 1982.
Fukai Toshimasa
Noda Yasushi
Suzuki Nobutaka
Yoshioka Nobuyuki
Chi Anthony R.
Kabushiki Kaisha Meidensha
Walsh Donald P.
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