Abstract:
A molybdenum silicide coating on Mo substrate was prepared by molten salt method. Microstructure, distribution of element and phase composition of the coating were analyzed by means of SEM, EDS and XRD. The formation mechanism of the molybdenum silicide phase was investigated. The results show that the molybdenum silicide coating was formed through reactive diffusion, and the microstructure of the coating was MoSi2, Mo5Si3 and matrix from the outside to the inside. When Na2SiF6 and NaF existed together in the molten salt, the coating had larger thickness. High-temperature oxidation resistance of the molybdenum silicide coating prepared at 1 000 ℃ for 10 h was relatively good. The thickness of coating increased with the increase of temperature and holding time, and effect of temperature on it was greater than that of holding time.