TA2表面等离子渗铌合金层在700~900 ℃的氧化行为

Oxidation Behavior of Surface Plasma Niobium Alloying Layer on TA2 at 700~900 oC

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

Abstract:

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