通过在1050℃下Si-Al-Y扩散共渗0～4 h在TiAl合金表面制备了Al、Y改性的硅化物抗氧化渗层,分析了共渗层的结构及相组成,并对其组织形成机理及高温抗氧化性能进行了研究.结果表明:1050℃共渗4h所制备的共渗层具有多层结构,由外向内依次为TiSi2外层、(Ti,X)5Si4及(Ti,X)5Si3(X表示Nb,Cr)中间层、TiAl2和γ-TiAl内层及富Al的过渡层,其中Y元素主要富集于共渗层的外层和中间层.不同时间共渗的结果表明,Si-Al-Y共渗层的形成是一个在基体表面先沉积Al,后沉积Si的有序过程.经1000℃高温氧化20h后共渗层表面形成了由TiO2外层及SiO2·Al2O3次外层组成的致密氧化膜;Y的氧化物主要存在于氧化膜与残余共渗层的界面处,能够有效地增强膜层的附着力.
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