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采用料浆熔烧法在Ta-10W合金表面制备硅化物涂层,分析了涂层的形貌、成分及元素含量,检测了涂层的高温性能。结果表明,涂层与基体之间通过扩散达到冶金结合;在高温氧化环境中,表面生成了一层玻璃状薄膜,有效阻止了外界氧向基体的进一步扩散。涂层在1800℃下连续工作10 h,室温~1800℃的热循环寿命为180次,对基体有良好的保护作用。
Silicide coating was prepared on the surface of Ta-10W alloy by slurry melting method. The morphology, composition and content of the coating were analyzed. The high temperature performance of the coating was tested. The results show that the diffusion between the coating and the substrate achieves metallurgical bonding. In high temperature oxidation environment, a glassy film is formed on the surface, effectively preventing the diffusion of oxygen to the substrate. The coating is continuously working at 1800 ℃ for 10 h, and the thermal cycle life at room temperature to 1800 ℃ is 180, which has a good protective effect on the substrate.