综述了我国航空发动机用高温钛合金材料体系的发展状况.针对未来高推重比航空发动机对新型轻质耐高温结构材料的需求,重点介绍了TiAl合金和siC纤维增强钛基复合材料2种关键的新型高温钛合金国外研究进展和应用情况.目前我国航空发动机主要应用的是α+β型钛合金,工作温度均在500℃以下,在更高温度使用的近α型钛合金(如600℃高温钛合金)尚处于研发阶段.国外对TiAl合金的研究已近20年,在航空发动机领域已公开报导了10多种TiAl零部件,并且完成了地面装机试验,试验结果非常理想.SiCf/Ti复合材料在航空发动机上的典型应用是叶环类和轴类零件,美、英等国均研制出了多个零部件,并进行了发动机考核试验.TiAl和siCf/Ti复合材料将是新一代高推重比航空发动机用的2种关键结构材料.
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