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在综合考虑高温用包覆型MCrAlX涂层的表面稳定性(表面抗氧化、抗腐蚀性能)、涂层内氧化现象及涂层/基材间界面稳定性等3个方面基础上,现采用多弧离子镀、磁控溅射两种物理气相沉积(PVD)方法,在GH220超合金表面制备了GH220/Ti-N/MCrAlX/Al多层复合防护涂层.研究表明,Ti-N膜为复合膜,由δ-TiN,ε-Ti_2N及α-Ti组成.MCrAlX平均成分为Co-32Cr-2.6Al-4.5Ta-0.2Y(重量百分数),采用直流磁控溅射法制备.选择Co基而不是Ni基MCrAlX涂层的原因是:Co基涂层具有更优异的抗热腐蚀性
Based on three aspects of the surface stability (surface oxidation resistance and corrosion resistance), the oxidation phenomenon in the coating and the stability of the interface between the coating and the substrate, MCrAlX coated with high temperature is considered Arc-ion plating and magnetron sputtering were used to fabricate a multi-layer composite protective coating GH220 / Ti-N / MCrAlX / Al on the surface of GH220 superalloy.The results show that Ti-N film is a composite The film consists of δ-TiN, ε-Ti_2N and α-Ti.The average composition of MCrAlX is Co-32Cr-2.6Al-4.5Ta-0.2Y (weight percentage), prepared by DC magnetron sputtering. The reason for not being a Ni-based MCrAlX coating is that the Co-based coating has more excellent hot corrosion resistance