High corrosion-and wear resistant-powder sintered alloy and comp

Details High corrosion-and wear resistant-powder sintered alloy and comp High corrosion-and wear resistant-powder sintered alloy and comp

1988-09-27

1990-10-09

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75246, 428552, 428627, 419 12, C22C 2914

Patent

active

049617818

ABSTRACT:
Wear resistant powder sintered alloy of excellent corrosion resistance comprising a hard alloy containing from 15 to 95% of a hard phase composed of a M.sub.3 B.sub.2 phase (M represents Ni or Co, Cr, Mo or W) structure in the matrix, wherein the hard alloy contains, on the weight basis, 0.5-9.0% of B, 14.0-35.0% of Cr, 14.0-50.0% of one or more of Mo and W, up to 3.5% of Si, 0.5-20.0% of one or more of Cu, Ag, Au and Pt and the balance of one or more of Ni and Co and inevitable impurities, and the matrix has a noble corrosion potential.
The novel abrasion resistant sintered powdery alloy has excellent corrosion resistance to corrosive gases such as hydrogen, SO.sub.2 and NOx which are often released from molding processes for plastics, rubbers, etc.

REFERENCES:
patent: 4217141 (1980-09-01), Schrittwieser
patent: 4400213 (1983-09-01), Sheinberg
patent: 4427446 (1984-01-01), Miura et al.
patent: 4729789 (1988-03-01), Ide et al.
patent: 4761344 (1988-09-01), Maki et al.

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