Double-metal-coated metal sulfide powder and process of producing the same
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United States of America Patent
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Jan 6, 1981
Grant Date -
N/A
app pub date -
Nov 28, 1978
filing date -
Jan 1, 1976
priority date (Note) -
Expired
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Abstract
A double-metal-coated metal sulfide powder comprises particles of a metal sulfide, a layer of a platinum group metal coating formed thereon, and an outer coating layer of a metal or alloy which contains at least one of iron, copper, nickel, and cobalt. The powder is obtained by forming a platinum group metal layer on metal sulfide particles by thermal decomposition of a plating composition which includes at least one platinum-metal compound containing a radical selected from the class consisting of NO, NO.sub.2, NO.sub.3, and NOCl and then forming a layer of at least one metal selected from the group consisting of iron, copper, nickel, and cobalt by the cementation reaction.
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