中文摘要：

采用双辉技术在TA2基体表面渗入铌形成结构致密、与基体形成冶金结合的钛铌合金层。结合XRD、SEM及EDS等手段分析渗铌和未渗铌TA2试样分别在700、800、900℃的高温氧化行为。实验结果表明：随着氧化温度的提高，氧化增重增加，渗铌比未渗铌的氧化增重降低，抗高温氧化性能改善，特别在900℃铌的作用明显；对渗铌和未渗铌TA2在900℃分别氧化20、40、100 h后氧化层的表面及截面进行分析，获得对合金层成分、结构、氧化性能之间关系的认识。钛铌合金层高温氧化后的氧化层是由三部分组成：外层是由高浓度合金层氧化而形成，其氧化产物主要是Nb2O5／TiO2，中间层主要由TiO2／TiO和Nb2O5组成，内层是分布着条状的富铌相。

英文摘要：

The high temperature oxidation of Ti-Nb alloy layer prepared by a double-glow technique was investigated. The oxidationbehavior of treated TA2 was analyzed at 700, 800 and 900 ℃ for 100 h in air by mean of XRD, SEM and EDS. The results show that theoxidation behavior of TA2 at 700-900 ℃ for 100 h is improved after niobium alloying process and the effect is more pronounced at 900℃. Cross-section morphology and composition of the treated TA2 after subjecting to oxidation for 20, 40 and 100 h at 900 ℃ werecharacterized using SEM and EDS. The upper layer is composed of the mixed oxides （Nb2O5/TiO2）, which are formed by the oxidationproduct of high concentration niobium alloyed layer; TiOJTiO/Nb205 exist in a compact intermediate layer, and the inner layer aredistributed with white stripe phase rich in niobium.