Abstract

This paper examines the effect of spraying conditions and WC grain size within the feedstock powders. Two different WC-12 wt percent Co-powders, namely one powder with a very fine powder grain fraction and one with a more conventional powder grain fraction, were applied using both a liquid fuel-powered and gas-powered high velocity oxy-fuel system. All coatings produced were subjected to sliding wear tests against an aluminum oxide ball; a sintered WC-Co composite was comparatively tested. The sintered composite structure (cermet) produced the highest wear resistance, while the conventional powder sprayed by means of a gas-operated burner produced the best coating. Paper includes a German-language abstract.

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