Dense fine grained monotungsten carbide-transition metal cemente

Details Dense fine grained monotungsten carbide-transition metal cemente Dense fine grained monotungsten carbide-transition metal cemente

1996-11-20

1998-06-30

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75242, 419 18, 419 32, 419 48, C22C 2900

Patent

active

057737355

ABSTRACT:
A cemented tungsten carbide body having a transition metal binder phase selected from the group consisting of iron, nickel and cobalt is formed, wherein the WC grains have an average WC grain size of at most about 0.5 micrometer in diameter and a maximum WC grain size of at most about 0.8 micrometer in diameter. Also, about 50 percent by volume of the WC grains in the body are angular grains and the body (1) contains an amount of the transition metal ranging from about 3 percent to about 18 percent by weight of the body, (2) is essentially free of grain growth inhibitors and (3) is essentially pore free. Said cemented tungsten carbide body is formed by mechanically mixing a source of WC with a source of transition metal, shaping the mixture into a porous body and sintering the porous body at a sintering temperature, superatmospheric pressure and time at temperature and time at superatmospheric pressure sufficient to form the cemented tungsten carbide body, wherein the sintering occurs without the formation of a liquid in the body and at least a portion of the time at superatmospheric pressure is at the sintering temperature.

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