Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Reexamination Certificate
2007-12-18
2007-12-18
King, Roy (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
C419S038000, C419S049000, C419S060000
Reexamination Certificate
active
11395981
ABSTRACT:
A sintered cemented carbide body (e.g., a cutting tool) and a method of making the same. The sintered cemented carbide body includes tungsten carbide, a binder phase of at least one metal of the iron group or an alloy thereof, and one or more solid solution phases. Each one of the solid solution phases has at least one of the carbides and carbonitrides of a combination of zirconium, niobium, and tungsten. The method includes the steps of providing a powder mixture that contains tungsten carbide, a binder metal powder comprising at least one metal of the iron group or an alloy thereof, and at least one of the carbides and carbonitrides of both zirconium and niobium including a powder of the carbides or carbonitrides of zirconium and niobium, forming a green compact of said powder mixture, and vacuum sintering or sinter-HIP said green compact at a temperature of from 1400 to 1560° C.
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PCT Search Report for International Application No. PCT/EP2004/011170 dated Apr. 11, 2005 (12 pages).
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Heinrich Hans-Wilm
Schmidt Dieter
Wolf Manfred
Kennametal Inc.
King Roy
Mai Ngoclan T.
Meenan Larry R.
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