摘要
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。
Plasma spray Mo coating on the pure niobium alloy substrate was prepared and the coating was vacuum heat treated at 1750-1950 ℃. Effects of different temperature and holding time on microstructure, porosity and hardness of the coating were studied, the best heat treatment process was put forward. The results indicate that appropriate heat treatment can enhance the compactness of Mo coating, generate the diffusion layer between Mo coating and niobium substrate, and strengthen the ability of the combination of coating and substrate. The best heat treatment process insulation is keeping 1850 ℃ for 1 h. Under the condition, porosity reduces to 0.9% and the microhardness is 113 HV0.5. MoSi2 coating is successfully developed on the surface of Mo coating after heat treatment.
出处
《热加工工艺》
CSCD
北大核心
2015年第12期163-166,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51475161)
