合金元素Nb在TiAl高温氧化行为中的作用  

THE EFFECT OF Nb ON THE OXIDATION BEHAVIOR OF TiAl ALLOY AT HIGH TEMPERATURE

作　　者：程晓英[1] 万晓景[1] 沈嘉年[1] 

机构地区：[1]上海大学材料所,上海200072

出　　处：《中国腐蚀与防护学报》2002年第2期69-71,共3页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金重大项目 5 9895 15 7;上海市青年基金项目 98QN46资助

摘　　要：研究了Ti 4 5Al 10Nb(at%)合金在 80 0℃～ 96 0℃氧气和空气中的氧化行为 ,并与Ti 5 0Al(at%)合金作一对比 ,表明该合金具有较好的高温抗氧化性能 ,其氧化增重速率略优于文献报道的铁基耐热不锈钢 .发现了Ti 4 5Al 10Nb合金在空气中的氧化增重速率明显低于在纯氧中的氧化增重速率 ,X -射线相分析与能谱分析表明氧化产物主要由TiO2 与Al2 O3 组成 ,但空气中氧化后的氧化产物中含TiN相 ,认为它是降低氧化速率的主要原因 ,并且认为合金元素Nb稳定了氧化层中的TiN相 ,因而提高了合金在空气中的抗氧化性能 .The oxidation behavior of a Ti-45Al-10Nb alloy has been studied in oxygen and air atmosphere at 800～960℃.It was shown that the alloy is better than Ti-50Al alloy in oxidation resistance.The oxidation rate in weight gain of Ti-45Al-10Nb is comparable to or even better than that of oxidation resistant steel.It was also found that the rate of oxidation in air decreases obviously than that in pure oxygen.Based on the result of X-ray or EDS analysis,the oxide scales consist of TiO 2 and Al 2O 3,but TiN was identified in the scale tested in air.It was concluded that TiN in the scale,which was stabilized by Nb,was responsible for the decreased rate of oxidation in air.

关 键 词：高温氧化 空气 氧气 TIAL合金 铌 合金元素 

分 类 号：TG172.82[金属学及工艺—金属表面处理]