研究了元素Si对不同Nb含量TiAl合金抗氧化性能的影响.结果表明,合金中Nb含量越低,Si对合金抗氧化性能的提高作用越明显主要表现为Si促使二元合金形成连续致密的Al2O3层及使不同Nb含量合金表层氧化物更加均匀细小因而随Si含基的增加,TiAl合金的氧化增重速率系数降低,氧化速率下降.运用等温氧化增重实验、X射线衍射和扫描电镜等手段对Si的作用进行了分析讨论.
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