The Influence of CEO2 Content on the Microstructure and Hardness of Ni-WC Coating Formed by Vacuum Fusion Sintering

Abstract

Made Ni-WC-CEO₂ composite coatings of different CEO₂ content on 45 steel matrixes by  vacuum fusion sintering. The coatings microstructure and the morphology of WC were observed by SEM, the elements diffusion between WC and Ni-base alloy by EDS；The Rockwell hardness of coatings’ surface and micro-hardness of coatings’ longitudinal section were measured by Rockwell hardometer and microhardness instrument. The results showed that: The defects in the coatings become less, WC in the coating is further refined, and its distribution changes uniform with adding content CEO₂. When the content of CEO₂ is 0.5%, the surface’s hardness and section’s microhardness are the highest, In this paper, the optimum content is 0.5%.