Influence of CeO2 Addition on Microstructure of Vacuum-Melting WC-Ni Base Alloy Coating
Samples of CeO2-WC- Ni base alloy coating were made on 45# steel substrate by vacuum melting. The influence of CeO2 addition on microstructure of longitudinal section of coatings, elements diffusion at the junction, and WC morphology and distribution was analyzed by scanning electron microscopy and energy dispersive spectroscopy. The results showed as follows: with 0.75% CeO2 addition, the coating best combined with the substrate and had least pores, cracks and other defects; CeO2 played a significant role in promoting the diffusion of alloying elements (mainly Fe, Ni diffusion at the junction); CeO2 changed the morphology and distribution of WC hard phase in the coating, making it small, uniform, and dispersed, and promoting the diffusion between Ni-based alloy and WC in the coating.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
Y. N. Wang et al., "Influence of CeO2 Addition on Microstructure of Vacuum-Melting WC-Ni Base Alloy Coating", Advanced Materials Research, Vols. 291-294, pp. 184-187, 2011