Abstract
This study assesses the erosion resistance of WC-CoCr coatings produced from multimodal and conventional powders. The feedstocks were sprayed with a high-velocity oxyfuel (HVOF) torch using propane and kerosene as the fuels. Powder morphology and coating structures were analyzed by OM, SEM, and XRD. Coating properties including porosity, hardness, and fracture toughness were measured and erosion resistance was determined by dry sand blasting. The mechanical properties of WC-CoCr coatings deposited using kerosene are shown to be superior to those sprayed with propane. Multimodal WC-CoCr coatings deposited using kerosene had the highest microhardness and fracture toughness, the lowest porosity, and the greatest resistance to solid particle erosion wear.
