Ti-22Al-26Nb合金的高温氧化行为  

Oxidation Behavior of Ti-22Al-26Nb Alloy at High Temperatures

作　　者：张学军[1] 赵书彦[1] 高春香[1] 王蕾[1] 王淑菊[1] 张英[1] 

机构地区：[1]沈阳化工学院,辽宁沈阳110142

出　　处：《稀有金属材料与工程》2009年第12期2183-2186,共4页Rare Metal Materials and Engineering

基　　金：辽宁省高等学校科学研究项目(05L342);沈阳化工学院博士科研启动基金(200603206)

摘　　要：采用热重法研究Ti-22Al-26Nb合金在800和900℃的高温氧化行为。利用X射线衍射分析(XRD)、扫描电镜(SEM)对氧化膜的相组成和形貌进行分析。结果表明:在氧化初期该合金遵循抛物线规律,而20h以后,合金的氧化动力学符合直线规律。氧化后的产物主要由TiO2、AlNbO4和Nb2TiO7组成,氧化膜出现了分层结构且氧化温度愈高,分层愈明显。High-temperature oxidation behavior of Ti-22Al-26Nb alloy was studied by thermogravimetry at 800 and 900℃. X-ray diffraction （XRD） analysis and scanning electron microscopy （SEM） were employed to characterize the phase composition and morphology of oxide films. Results show that the oxidation of the alloy was parabolic at the transient stage, while it was approximately linear from 20 h to the end of the oxidation. Oxides mainly composed of TiO2, AINbO4 and Nb2TiOT, and the oxide scale was stratified, which became more obvious with oxidation temperature increasing.

关 键 词：Ti-22Al-26Nb 高温氧化 Nb的影响 

分 类 号：TG146.23[一般工业技术—材料科学与工程]