TiAl合金熔体与铸型界面反应研究进展

Research status of interfacial reaction between TiAl alloy melt and mold materials

通过对精密铸造及定向凝固TiAl合金与型壳材料界面反应的研究现状进行综述,指出石墨型壳、高熔点金属型壳、氧化物型壳、锆酸盐型壳与熔融TiAl合金之间的反应机理及相互作用程度:石墨型壳界面反应程度较剧烈,C污染严重;高熔点金属型壳制备成本较高,实际使用中对环境条件要求苛刻;氧化物型壳材料来源广泛,相对成本较低,对比常用的CaO、Al 2O 3、ZrO 2型壳,Y 2O 3型壳与熔融TiAl合金界面反应程度最微弱;锆酸盐型壳界面反应程度较微弱,展现出相当大的应用潜力.未来应重点研究氧化物型壳和锆酸盐型壳在铸造TiAl合金领域的应用,可侧重于改良型壳材料的内部构造、开发更为稳定的粘接剂材料等方面.

By reviewing the current research status of the interface reaction between the precision casting and directionally solidified TiAl alloy and the shell material,it was pointed out that the reaction mechanism and degree of interaction between graphite shell,high melting point metal shell,oxide shell,zirconate shell and molten TiAl alloy were as follows:The graphite shell had more severe interface reactions and serious C pollution;the preparation cost of high melting point metal shells was relatively high,and its actual use required harsh environmental conditions;oxide shell materials had a wide range of sources and relatively low cost.Compared with the commonly used CaO,Al2O3,and ZrO2 shells,the interface reaction between the Y2O3 shell and the molten TiAl alloy was the weakest;the zirconate shell had a weaker interface reaction,showing considerable application potential.In the future,the application of oxide shells and zirconate shells in the field of cast TiAl alloys should be researched.Focus could be put on optimizing the structure of the shell materials and developing more stable adhesive materials.