通过对定向凝固过程中TiAl合金与氧化铝、氧化锆坩埚材料的界面化学反应进行研究,分析了夹杂物的分布规律以及反应机制。结果表明:氧化铝坩埚中的SiO2粘结剂与TiAl合金发生界面化学反应,使坩埚内壁的Al2O3颗粒脱落进入TiAl合金熔体,夹杂物在整个试样中呈弥散分布。TiAl合金与氧化锆坩埚的化学反应仅发生在合金试样表面,反应生成的黑色氧化锆具有较大脆性,并在试样表面形成厚厚的粘结层。 The interfacial chemical reaction between TiAl alloy and alumina and zirconia crucibles was investigated in the process of directional solidification. The distribution of inclusions and the reaction mechanism were analyzed. The results show that the SiO2 binder in the alumina crucible interfacially chemically interacts with the TiAl alloy, causing the Al2O3 particles on the inner wall of the crucible to fall off into the melt of the TiAl alloy. The inclusions are dispersedly distributed throughout the sample. The chemical reaction between TiAl alloy and zirconia crucible only occurs on the surface of the alloy specimen. The black zirconia formed by the reaction has a large brittleness and forms a thick adhesive layer on the surface of the specimen.