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利用火焰热喷涂在Ti-Al合金表面喷涂铝涂层,通过金相显微镜、扫描电镜(SEM)观察及显微硬度测试等方法研究了铝涂层在850℃下的抗高温氧化性能。结果表明,涂层基体界面处平直,结合较好,主要为机械结合;在氧化过程中由于Al和Ti之间的相互扩散,形成了冶金结合的扩散层。高温氧化后,扩散层硬度明显提高,有涂层试样氧化速率明显低于无涂层的试样,其抗高温氧化性能好。
Aluminum coating was sprayed on the surface of Ti-Al alloy by flame spraying. The high temperature oxidation resistance of aluminum coating at 850 ℃ was studied by metallographic microscope, scanning electron microscope (SEM) and microhardness test. The results show that the bonding interface of the coating is flat and well bonded, mainly by mechanical bonding. Due to the interdiffusion between Al and Ti, the metallurgical diffusion layer is formed during the oxidation process. After high temperature oxidation, the diffusion layer hardness increased significantly, the oxidation rate of the coated sample was significantly lower than the uncoated sample, its high temperature oxidation resistance.