The influence of high temperature exposure on the wear of selected HVOF sprayed coatings

Abstract

The influence of high temperature exposure on the mechanical and wear properties of selected HVOF sprayed CrC and No/Co - based alloy coatings were tested. Comparison of assprayed and 600°C/116 h annealed coatings' microhardness, cohesive strength, abrasive and adhesive wear resistance showed that the Co-based Stellite 6 coating's wear properties were deteriorated by heat exposure despite of the increase of its hardness and cohesive strength. The heat exposure was found to be beneficial for both mechanical and wear properties of NiCrBSi self-fluxing coating. On the contrary, mechanical properties of Cr3C2-NiCr coating slightly decreased, while its wear resistance slightly increased as a result of high temperature exposure.