Design the Compositions of Low Friction Coefficient Bimodai Coatings for Heavy Load Component

摘要

In this study, the Cu doped bimodai WC-Co coatings were prepared using high velocity oxy-fuel (HVOF) technique. The microstructure and high temperature wear performance have been investigated. The hardness of Cu doped WC-Co coating is 1254.78 + 66.27 HVo.i and the addition of Cu can reduce the porosity. The friction coefficients and wear rates of the Cu doped WC-Co coating tested at different temperatures kept a stable and low value. The minimum values had been obtained at 450°C, which were 0.42 and 2.76× 10~(-6) mm~3 N~(-1)-m~(-1), respectively. At high temperature, the soft Cu can flow to the surface. The soft Cu and oxide of Cu spread out on the worn surface and then formed a self-lubricating film, which resulted to decrease the friction coefficient and wear rate.