Cavitation Resistance of HVOF Deposited WC-CoCr Cermet Coatings in Hydraulic Applications

Enwei Qin, Bo Wang, Qian Huang, Chenyang Pan,Shuhui Wu,Wenli Li

International Thermal Spray ConferenceThermal Spray 2019: Proceedings from the International Thermal Spray Conference（2019）

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Abstract Thermal spray coatings are an effective means for improving the cavitation resistance of hydroturbine components, especially in on-site repair situations. In this study, WC-CoCr cermet coatings are deposited by HVOF spraying and their microstructure, hardness, and cavitation behavior are assessed. The coatings exhibit better cavitation resistance than stainless steel with an erosion mechanism that leaves wrinkles and craters that correspond to specific erosion stages.

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