Y_2O_3对Cr-Nb合金高温抗氧化性能作用机制的研究  

Study on Action Mechanism of Y_2O_3 on High Temperature Oxidation-Resistance of Cr-Nb Alloy

作　　者：苏倩[1] 鲁世强[1] 刘志和[1] 郑海忠[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《航空材料学报》2008年第6期67-71,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金资助项目(50474009);航空科学基金资助项目(05G56003);江西省自然科学基金资助项目(0350045)

摘　　要：采用球磨+热压工艺制备添加0.5wt.%稀土氧化物Y2O3的Cr-Nb合金,研究了Y2O3对Cr-Nb合金在1100℃和1200℃高温氧化性能的作用机制。结果发现,Y2O3的加入,减缓了Cr-Nb合金在1100℃的氧化速度;虽然在1200℃氧化增重比未加Y2O3的Cr-Nb合金高,但是大大增加了氧化膜/基体的结合力,改善了氧化膜的抗剥落性,在一定程度上改善了Cr-Nb合金的高温抗氧化性能。Cr-Nb alloys with 0. 5wt. % Y2O3 were prepared by mechanical alloying （MA） and hot pressing. The action mechanism of Y2O3 on the high temperature oxidation properties of Cr-Nb alloy was investigated at 1100℃ and 1200℃ respectively. The results show that the addition of Y2O3 slows down the oxidation speed at 1100℃ ; Though the weight gain of the sample added Y2O3 is slightly higher than that of Cr-Nb alloy without Y2O3 exposured at 1200℃ , Y2O3 can, based on the results of SEM, increase the adherence of oxide film/substrate and improve the oxide film anti-flaking, which improve high temperature oxidation-resistance properties of Nb-Cr alloy to a certain extent.

关 键 词：稀土氧化物 Cr—Nb合金 高温氧化 氧化膜 

分 类 号：TG132.32[一般工业技术—材料科学与工程]