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High velocity oxy-fuel (HVOF) spraying is now frequently used to produce high quality WC-Co coatings on surfaces which are subjected to certain kinds of wear in service. The available literature on thermally sprayed WC-Co coatings is considerable, but it is difficult to synthesize all of the findings. This is due to the many different starting powders, spray system types, spray parameters, and other variables that influence the coating structures and cause difficulties when comparing results from different workers. To ensure the performance of sprayed cermet coatings it is essential to understand failure mechanism of the substrate-coating system. In the present work, two different thermal spray coatings - tungsten carbide-based and chromium carbide-based coatings deposited by HVOF and plasma processes were studied.