采用自蔓延高温合成技术制备了TiAl/Al₂O₃复合材料,研究了原料配比对合成过程及产物特征的影响,结果表明,随着Al₂O₃含量的增加,燃烧温度和燃烧速度均增大,材料的致密度得到改善.Al₂O₃颗粒尺寸小于1μm,分布于基体交界处,有一定程度的团聚.通过差热分析研究了Al-Ti-TiO₂体系反应过程,发现Al-TiO₂还原较晚开始,但由于激活能低而速度较快,因此较早完成.TiAl₃最早生成,但只作为中间产物存在,随后向TiAl和Ti₃Al相转变的过程为控制环节,其激活能也体现为总反应的激活能.

TiAl/Al₂O₃ composites were synthesized by SHS method. The effects of Al₂O₃ content on the SHS process of Al Ti-TiO₂ system and the microstructure of products were studied. It is shown that both the combustion temperature and wave velocity increase with increasing Al₂O₃ content. In addition, the relative density of productsis also improved with more Al₂O₃ content. The reaction process of Al-Ti-TiO₂ system was investigated through thermal differential analysis (DTA).It is concluded that, despite later commencement, the reduction of TiO₂ is completed earlier than reactions between Al and Ti due to faster reaction rate resulted from smaller activation energy. TiAl₃ formed in early stage as intermediate product and its conversion to TiAl and Ti-3Al is dominating reaction in Al-Ti-TiO₂ system.