Hard sintered alloy having fine pores and process for preparing

Details Hard sintered alloy having fine pores and process for preparing Hard sintered alloy having fine pores and process for preparing

1993-07-19

1995-05-02

Mai, Ngoclan T.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75235, 75236, 75239, 75240, 75241, 75242, 75243, 75244, 75246, 428547, 428550, 428552, 428565, C22C 2900

Patent

active

054115710

ABSTRACT:
Disclosed are a hard sintered alloy having fine pores which comprises a sintered alloy comprising 2 to 30% by volume of a dispersed phase of at least one of oxide, carbide and sulfide of Ca, Sr or Ba and mutual solid solutions of these, and the balance of a binder phase comprising at least one metal of Co, Ni and Fe or an alloy containing said metal as a main component and a hard phase of at least one of carbide, nitride and boride of the 4a (Ti, Zr, Hf), 5a (V, Nb, Ta) or 6a (Cr, Mo, W) group metal of the periodic table and mutual solid solutions of these, with a volume ratio of said binder phase to said hard phase being 2:98 to 95:5, wherein fine pores are formed by removing said dispersed phase from a surface portion of said sintered alloy, and a process for preparing the same.

REFERENCES:
patent: 4925490 (1990-05-01), Nagai et al.
patent: 4971624 (1990-11-01), Clark et al.
patent: 5288676 (1994-02-01), Shimada et al.

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