CeO_2颗粒对铌合金表面镀渗复合涂层抗氧化性能的影响  

Effect of CeO_2 Addition on High Temperature Oxidation Resistance of Composite Coating on Niobium Alloy

作　　者：杨阳[1] 黄祖江 唐仕光 董婉冰 李伟洲[1] 张修海[1] 

机构地区：[1]广西大学,广西南宁530004

出　　处：《稀有金属材料与工程》2017年第12期3953-3960,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51371059;51001032);广西自然科学基金(2014GXNSFCA118013);广西自然科学基金创新研究团队项目(2011GXNSFF018001);广西高等学校高水平创新团队项目第二批

摘　　要：为了提高铌合金的高温抗氧化性,采用化学镀结合包埋渗技术在铌合金表面制备了含有CeO_2颗粒的复合涂层,研究了复合涂层的微观结构和高温抗氧化性能。结果表明,不含CeO_2的Al/Ni涂层以NiAl相为主,Al/Ni-CeO_2涂层则含NiAl、NiAl_3、Al3Nb和CeO_2等相。经1000℃氧化测试,Al/Ni复合涂层氧化50 h后增重为8.0 mg/cm^2,表面主要生成Al_2O_3、AlNbO_4相;Al/Ni-CeO_2复合涂层50 h后氧化增重为4.0 mg/cm^2,表面以Al_2O_3、CeO_2、NiAl、NiAl_3、Al3Nb、AlNbO_4相为主。高温氧化后,2种涂层样品表面均生成连续致密的Al_2O_3膜,涂层与基体结合良好;含CeO_2的涂层,其稀土氧化物主要在Ni膜拖拽力作用下富集于涂层互扩散区。稀土氧化物颗粒的添加细化涂层组织,降低涂层中Al元素的消耗,填补涂层中的孔洞,增强了氧化膜与涂层的粘附力,有效提高了涂层的抗氧化性。In order to improve the high temperature oxidation resistance of niobium alloy,electroless plating combined with pack cementation was used to obtain composite coatings with or without CeO2 particles.The microstructure and high temperature oxidation resistance of the composite coatings were investigated.The results show that Al/Ni coating contains NiAl phase,while Al/Ni-CeO2 coating is made up of NiAl,NiAl3,Al3Nb and CeO2,etc.The oxidation test of the composite coatings was carried out at 1000 °C.After 50 h oxidation,the mass gain of the Al/Ni composite coating is 8.0 mg/cm^2,with the formation of Al2O3 and AlNbO4 phase;the mass gain of the Al/Ni-CeO2 composite coating after 50 h oxidation is 4.0 mg/cm^2,with Al2O3,CeO2,NiAl,NiAl3,Al3Nb and AlNbO4 phase.On the surface of two coating systems,continuous dense Al2O3 scales are detected with good adhesion to the coating.CeO2 particles are mainly aggregated in the interdiffusion zone under the drag force of Ni.The addition of CeO2 particles refines the coating structure,reduces the consumption of Al element in the coating,fills the holes,and enhances the adhesion of the scales to the coating,so as to improve the oxidation resistance of the coating.

关 键 词：铌合金 高温抗氧化性 化学镀 包埋渗 CeO2颗粒 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG146.416[金属学及工艺—金属学]