一、前言 MCrAlY涂层具有优良的抗热腐蚀性能,适用于运行参数高、使用环境恶劣的燃气轮机涡轮叶片。用离子溅射工艺制备的MCrAlY涂层,具有成份容易控制,组织比较致密的优点,因而越来越受到重视。此工艺需用与涂层同成份合金制成的靶,但由于机械加工的原因,常选用高铬低铝型靶材。这种类型的MCrAlY涂层在熔融硫酸盐环境中具有良好的抗热腐蚀性,但在含氯化钠的熔盐环境中抗蚀性变差,热腐蚀孕育期缩短。采用渗铝可提高MCrAlY涂层中 I. Introduction MCrAlY coating has excellent resistance to hot corrosion, suitable for high operating parameters, the use of harsh gas turbine turbine blades. The MCrAlY coating prepared by the ion sputtering process has the advantages of easy control of composition and relatively dense structure, and therefore attracts more and more attention. This process needs to be coated with the same alloy made of the target, but due to mechanical processing reasons, often choose high-chromium low-aluminum target. This type of MCrAlY coating has good resistance to hot corrosion in molten sulphate environments, but deteriorates its corrosion resistance in molten salt environments containing sodium chloride and shortens the hot corrosion incubation period. Aluminized aluminum can improve the MCrAlY coating