TiAl基金属间化合物表面涂层研究进展

TiAl合金具有优异的高温力学性能，可以作为Ni基高温合金的轻量化替代材料，但氧化和磨损等行为限制了TiAl合金的高温服役时间，不利于工业化应用。通过在TiAl合金表面沉积涂层，可以使材料兼具基体的力学性能和涂层材料的表面性能，以提高TiAl合金适应不同服役环境的能力，进而拓展其应用范围。列举了TiAl合金使用的涂层材料应具有的性质;介绍了常见涂层的制备方法;以涂层成分分类，分别总结了不同涂层体系的研究现状，并展望了制备工艺和涂层性能的发展趋势。

Development Status and Prospect of Coatings for TiAl-based Intermetallics

With excellent high-temperature mechanical property, TiAl alloys are expected to replace Ni-based superalloys owing to the lightweight feature in the industry application. However, unsatisfactory oxidation and wear resistance result in limited high-temperature life of TiAl alloys, which is unfavorable for industrial application. Preparing coatings on TiAl alloys could enhance the durability of the alloy in different service environments and thus improve its range of application, because the mechanical and surface properties of substrate and coating are kept after deposition. This work describes the desired characteristics and then the usual preparation method of coatings used for TiAl alloy as well as the classification of coatings, summrizes the research status of different coating systems and prospeets the development trend of preparation technology and coating properties.