In this study, Cr3C2+25NiCr hardmetal powder is mixed with small amounts of NiCr and CoCr powder and sprayed on steel substrates with a high-velocity oxyfuel torch. High-temperature friction tests are used to assess tribological performance and investigate the formation of tribolayers. The results of the study show that the friction coefficient of HVOF sprayed hardmetal coatings can be reduced by adding small amounts of low-friction powder to the feed stocks prior to spraying. The reduction in friction is the result of a tribochemical reaction that occurs on friction surfaces under contact conditions involving high temperature, pressure, and sliding speed. Paper includes a German-language abstract.
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