Methods for making WC-containing bodies

Details Methods for making WC-containing bodies Methods for making WC-containing bodies

1995-11-13

1997-03-18

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 93, 501 96, C04B 3556

Patent

active

056122640

ABSTRACT:
A method of forming a low level carbon high-density tungsten carbide-containing material includes sintering a preform which contains tungsten carbide powder and has a composition such that the resulting sintered material has at most 6.05 weight percent tungsten-bound carbon based on the total weight of tungsten and tungsten-bound carbon. This low level of carbon may be achieved by, prior to the sintering step, oxidizing the tungsten carbide powder sufficiently to achieve the desired substoichiometric carbon level in the sintered product or by adding a carbon-lowering material selected from the group consisting of tungsten, ditungsten carbide, and tungsten oxide. Optionally, other materials can be present in the preform such as carbon-getter metals and compounds thereof. The carbon-getter metals are those metals of which the carbides thereof are more thermodynamically stable than monotungsten carbide.

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