Abstract
Tungsten-based heavy alloys are produced by sintering from elemental W, Ni, Fe and Cu powder mixtures, where the tungsten content is in the range 80--98 weight%. The alloys, however, show relatively poor surface properties such as wear and corrosion resistance. In the present study, a relatively simple method was used for modification of heavy alloy surfaces. The method involved conversion of W to WC in a flowing CH{sub 4} + Ar gas atmosphere without the aid of plasma. Composition, microstructure and hardness of the treated surfaces of the alloy were studied.
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