等离子喷涂Al_2O_3与ZrO_2复合热障涂层的高温性能  

Thermal Behavior of Thermal Barrier Coatings Composed with Al_2O_3 and ZrO_2 Sprayed by Plasma

作　　者：张罡[1] 武颖娜[1] 梁勇[1] 冯钟潮[1] 巴瑞章[2] 

机构地区：[1]中国科学院金属研究所 [2]北京航空制造技术研究所,北京100024

出　　处：《稀有金属材料与工程》2003年第9期756-760,共5页Rare Metal Materials and Engineering

基　　金：国防科技重点实验室基金项目资助(99JS.50.4.1)

摘　　要：采用等离子喷涂(PS)方法,在GH536高温合金基材上制备了传统的双层热障涂层(TBCs)和2种含有Al2O3与ZrO2陶瓷复合层的3层热障涂层。传统TBCs结构为Ni22Cr10AlY合金连接层和8%Y2O3部分稳定的ZrO2(8YPSZ)陶瓷顶层;3层TBCs中分别采用置于8YPSZ陶瓷层内层及外层的Al2O3与8YPSZ复合层。3种类型试样的100h,1050℃静态氧化试验及1050℃热震试验结果表明:3层涂层较双层涂层的氧化阻力提高,双层涂层的热震阻力最佳,氧化阻力最差。不同复合层形式试样的热振失效方式和寿命也有差别,复合层置于陶瓷层外层热震寿命略高,但100h氧化增重有明显提高,抗氧化性降低。Three types of thermal barrier coatings(TBCs) were prepared by plasma spray (PS) on GH536 superalloy substrate with different layers. One is the traditional TBC with Ni22Cr10AlY as bond coat and ZrO2-8wt% Y2O3 (8YSZ) as top coat, the other two TBCs have a triplex structure with composite layers of 8YSZ + Al2O3 and ZrO2, respectively. The static oxidation test and thermal shock tests were conducted to evaluate the oxidation kinetics and thermal shock cyclic lifetime of the TBCs. With the different failure criterions, the failure mechanism of TBCs was discussed. The thermal shock resistance of state-of-the-art duplex TBCs is the best. It is indicated that the higher oxidation resistance is obtained by using of composite 8YSZ + Al2O3 ceramic layer. It has the better oxidation resistance if using 8YSZ + Al2O3 as the inner composite layer of TBCs, comparing with as the out layer.

关 键 词：等离子喷涂 热障涂层 静态氧化试验 热震试验 

分 类 号：TG174.4[金属学及工艺—金属表面处理]