(1. 哈尔滨工业大学 金属精密热加工国家级重点实验室，哈尔滨 150001；
2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 通过在TiAl合金熔模铸造用陶瓷型壳ZrO2面层中添加纯Si元素粉末，研究Ti-46Al和Ti-46Al-7Nb两种合金与纯ZrO2面层与含有Si面层的反应界面。结果表明：4种界面的界面反应扩散层的厚度都约为200 μm，但是Si元素的扩散能力远大于Zr的，并与Ti发生反应，可见最深处的反应物离界面约为50 μm。
关键字: TiAl合金；熔模铸造；界面反应；Si；元素扩散
（1. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals,
Harbin Institute of Technology, Harbin 150001,China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The interfacial reactions between TiAl castings and ceramic moulds were investigated. The reaction interface between two kinds of alloys as Ti-46Al and Ti-46Al-7Nb and two kinds of ceramic moulds as pure ZrO2 and ZrO2 and Si were employed. The results show that the thicknesses of the four kinds of interfacial reaction layers are almost of about 200 μm. The diffusion ability of Si is higher than that of Zr, and the Ti-Si can be found 50 μm away from the interface between the alloy and ceramic mould.
Key words: TiAl alloy; investment casting; interfacial reactions; Si; element diffusion
