稀土元素对Nb-Si基超高温合金的合金化作用和抗氧化涂层改性作用  

Effects of Rare Earth Elements on Alloying and Anti-oxidation Coating Modification of Nb-Si Based Alloys

作　　者：孙志平[1] 尹梦娇 赵崇军[1] 

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《铸造技术》2016年第5期944-947,共4页Foundry Technology

基　　金：国家自然科学青年基金(51401032);中央高校基金(0009-2014G1311089)

摘　　要：由铌基固溶体和金属间化合物组成的Nb-Si基超高温合金是当前新型高温结构材料的研究热点,但是其抗氧性能较差制约了合金的应用,合金化和涂层制备是提高抗氧性能的重要途径,稀土在合金化和涂层改性两个方面都具有特定的益处。综述了在合金化时添加稀土(Y、Ce、Dy、Ho)对微观组织和力学性能的影响,论述了稀土或稀土氧化物(Y、Ce、Y_2O_3、CeO_2)对硅化物抗氧化涂层的改性作用机理。The Nb-Si based ultrahigh temperature alloys consist of Nb solid solution and intermetallic compound, is recent studying hotspot as potential high-temperature structural materials, but the poor oxidation resistances of these alloys restricts their wide applications. The alloying and the protective coatings are effective methodologies to improve oxidation resistances, and REEs are beneficial for both the alloying and the coating modifications. The effects of REE（Y, Ce, Dy and Ho） alloying on microstructures and mechanical properties weres summarized in this paper, and the modification mechanism of REE or REE oxide（Y, Ce, Y2O3 and CeO2） for the silicides coatings was discussed.

关 键 词：Nb-Si基合金 稀土 合金化 涂层 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—合金]