稀土元素钇对Laves相NbCr_2合金在1100℃氧化行为的影响  

Effect of Rare Earth Element Yttrium on Oxidation Behavior of Laves Phase NbCr_2 Alloy at 1100℃

作　　者：郑海忠[1,2] 鲁世强[2] 闵嗣林[2] 崔霞[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016 [2]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《机械工程材料》2009年第3期94-97,共4页Materials For Mechanical Engineering

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：采用机械合金化及热压烧结工艺制备了掺杂0.07%～1.35%(质量分数)稀土元素钇的Laves相NbCr_2合金,研究了钇含量对NbCr_2合金在1 100℃氧化行为的影响,并探讨了其作用机制。结果表明:只有添加适量的钇(0.07%～0.14%)才能降低NbCr_2合金的氧化速率,提高NbCr_2合金的抗氧化性能;NbCr_2合金高温抗氧化性能的提高,主要是由于稀土元素钇增强了氧化膜与基体的结合性能。Laves phase NbCr2 alloys with 0.07 %- 1.35 % rare earth element Y were prepared by mechanical alloying and hot pressing technologies. The influence of Y content on the high temperature oxidation behavior of NbCr2 alloys at 1 100 ℃ was investigated, and the action mechanism of the Y element was also discussed. The results show that only when Y content was in the right range（0. 07%-0. 14%）, it could slow down the oxidation rate and increase the high temperature oxidation-resistance of NbCr2 alloys at 1 100 ℃, which was attributed to that rare earth element Y improved the adherensive properties of oxide film/substrate.

关 键 词：LAVES相 NbCr2合金 高温氧化 稀土元素钇 

分 类 号：TG172.82[金属学及工艺—金属表面处理]