(中国科学院金属腐蚀与防护研究所,金属腐蚀与防护国家重点实验室， 沈阳 110015)
摘 要: 研究了渗铝、 Co-30Cr-6Al-0.5Y(质量分数， %)和反应溅射Al2O3及Ti-50Al-10Cr(摩尔分数，%)涂层对TiAl金属间化合物在900和1000℃的循环氧化性能的影响。 结果表明：几种涂层均不同程 度地提高了TiAl的抗循环氧化性能, 其中TiAlCr涂层表现出最好的效果。 渗铝涂层内出现 大 量贯穿性裂纹；CoCrAlY涂层和基体之间存在严重的互扩散，形成的孔洞已连成了较大的裂纹， 且涂层内出现裂纹； Al2O3膜易开裂剥落, 提高TiAl 的抗循环氧化性能十分有限；而TiAlCr涂层表现出好的涂层-基材相容性， 循环氧化后涂层内没有出现裂纹，涂层-基材结合致密。
关键字: TiAl金属间化合物 循环氧化 防护涂层
（State Key Laboratory for Corrosion and Protection,Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences, Shenyang 110015, P. R. China）
Abstract:Effect of aluminide , CoCrAlY, Al2O3 and TiAlCr coatings on cyclic oxidation resistance of TiAl intermetallics was investigated. The results showed that these coatings are very effective in improving the cyclic oxidation resistance of TiAl, and the TiAlCr coating exhibited the best positive effect . Many cracks appeared in the aluminide coating because of the brittleness of TiAl3. Severe interdiffusion between CoCrAlY coating and TiAl may result in poor adherence between CoCrAlY coating and TiAl . Reactively-sputtered Al2O3 film has little effect in improving the cyclic oxidation resistance of TiAl due to the brittleness of Al2O3 film. The TiAlCr coating exhibited an excellent compatability to TiAl , no obvious interdiffusion existed between the coating and the substrate, and no cracks and voids appeared in the coatings and the coating-substrate interface.
Key words: TiAl intermetallics cyclic oxidation coatings
