Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Reexamination Certificate
2006-07-04
2006-07-04
Mai, Ngoclan T. (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
C075S240000, C075S242000, C428S547000, C428S545000
Reexamination Certificate
active
07070643
ABSTRACT:
There is disclosed a compositionally graded sintered alloy which comprises: 1 to 40% by weight of a iron group metal; 0.1 to 10% by weight of at least one type of a specific metal element selected from the group consisting of Cr, Au, Ge, Cu; Sn, Al, Ga, Ag, In, Mn and Pb; a hard phase containing, as a main component, at least one compound selected from the group consisting of a carbide, a nitride and a mutual solid solution of a metal(s) which belongs to Group 4 (Ti, Zr, Hf), 5 (V, Nb, Ta) or 6 (Cr, Mo, W) of the Periodic Table; and inevitable impurities, wherein the content of the specific metal element gradually increases from a surface of the sintered alloy toward an inner portion thereof, and a ratio of the average concentration of the specific metal element in a region which is at least 1 mm inside from the surface of the sintered alloy, to the average concentration of the specific metal element in a region between the surface and the position which is 0.1 mm inside the surface, of the sintered alloy, is 1.3 or more.
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Mai Ngoclan T.
Toshiba Tungaloy Co., Ltd.
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