Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
2006-08-29
2006-08-29
Mai, Ngoclan T. (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C075S240000, C419S014000, C419S057000, C419S060000, C428S547000, C428S548000, C428S698000
Reexamination Certificate
active
07097685
ABSTRACT:
A cemented carbide comprises a binder phase consisting essentially of an iron family metal, a first hard phase consisting essentially of WC having a hexagonal crystal structure, and a second hard phase consisting essentially of one or more types of a compound of a metal or metals of group 4, 5 or 6 of the periodic table having an NaCl-type cubic crystal structure. The cemented carbide is formed by a surface region with a thickness of 2 to 50 μm consisting of the binder phase and the first hard phase, and an inner region present underneath the surface region consisting of the binder phase, the first hard phase and the second hard phase. A ratio of an average grain size of the first hard phase in the surface region to an average grain size of the first hard phase in the inner region is 1 or less, and a ratio of an area of the binder phase in the surface region to an area of the binder phase in the inner region is greater than 1.
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Walter Lengauer, et al., “Functionally graded hardmetals”, Journal of Alloys and Compounds, vol. 338, No. 1-2, XP-004349178, May 16, 2002, pp. 194-212.
Kinoshita Satoshi
Miura Hiroyuki
Mai Ngoclan T.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tungaloy Corporation
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