Abstract:Research Status and Fabrication of Nickel, Copper Matrix SiC Composite Coatings prepared by oxy-acetylene flame spraying and fusing. The microstructures of the coatings were analyzed by using XRD and SEM. The hardness and electrochemical properties of the coatings were measured. The slurry erosion resistance properties and mechanisms of the two coatings in fresh water and 3.5wt.% NaCl medium were studied. The results show that in the microstructure of the Ni-based alloy sprayed and fused coating reinforced with nano-WC, nano-WC is evenly embedded in γ solid solution and Cr23C6, Cr7C3 etc., the hard phase, forming dispersion strengthening, which increases the hardness by 13%. Compared with the Ni60CuMo coating, the Ni-based alloy coating of Ni60CuMo reinforced with nano-WC possesses a lower potential and a higher corrosion current density in 3.5wt.% NaCl medium and its resistance of slurry erosion in fresh water and 3.5wt.% NaCl medium, has been enhanced about 53% and 20% higher than that of Ni60CuMo coating, respectively. The addition of nano-WC significantly improves the slurry erosion resistance of the Ni-based alloy coating, but in 3.5wt.% NaCl medium, a large number of micro-batteries are formed between WC and NiCr alloy, which accelerates the erosion-corrosive wear, and its enhanced effect on the slurry erosion resistance of theNi-based alloy sprayed and fused coating is weakened.