Research on Slurry Erosion Resistance of Nano-structured WC-12Co Coatings Deposited by HVOF
The WC-12Co cermet coatings with nano-structured, multimodal and conventional were sprayed by HVOF, and the microstructure and microhardness of coatings with different structure were compared. Finally slurry erosion tests of various structured WC-12Co coatings and sprayed and fused Ni60 coating were carried out and their wear failure mechanisms of WC-12Co coatings were explored. The results show that the microstructure of nano-structured and multimodal WC-12Co coatings prepared by HVOF are dense with little porosity, and their microhardness values are obviously higher than conventional WC-12Co coating. As well, it is found that nano-structured and multimodal WC-12Co coatings exhibit better slurry erosion resistance in comparison with the conventional coating, and the slurry erosion resistance is respectively enhanced by above 50% and 20%.