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在纯铌基体上等离子喷涂Mo涂层,将试样在1750~1950℃进行真空热处理,研究了不同温度、不同保温时间对涂层微观组织、孔隙率和硬度的影响规律以及Mo涂层的最佳热处理工艺。结果表明,适当的热处理可以增加Mo涂层的致密性,在Mo涂层与铌基体之间生成了扩散层,增强了涂层与基体的结合力。喷涂态Mo涂层最佳热处理工艺为1850℃保温1 h,此工艺下获得Mo涂层的孔隙率为0.9%,显微硬度113 HV0.5。在热处理后Mo涂层的表面成功制备了MoSi2涂层。
The Mo coating was plasma sprayed on the pure niobium substrate. The samples were vacuum heat-treated at 1750 ~ 1950 ℃. The effects of different temperature and holding time on the microstructure, porosity and hardness of the coatings were investigated. Good heat treatment process. The results show that appropriate heat treatment can increase the compactness of the Mo coating and form a diffusion layer between the Mo coating and the niobium matrix, which enhances the adhesion between the coating and the substrate. The optimum heat treatment process of spray coating Mo coating is 1850 ℃ for 1 h, the porosity of Mo coating is 0.9% and the microhardness is 113 HV0.5. MoSi2 coating was successfully prepared on the surface of Mo coating after heat treatment.