微弧等离子喷涂制备空心莫来石隔热涂层研究  

Micro-plasma Sprayed Hollow Mullite Thermal Barrier Coatings

作　　者：侯平均[1] 王汉功[1] 汪刘应[1] 华绍春[1] 吴永发[1] 

机构地区：[1]第二炮兵工程学院,陕西西安710025

出　　处：《兵工学报》2009年第8期1108-1113,共6页Acta Armamentarii

摘　　要：采用微弧等离子喷涂方法制备了空心微珠莫来石隔热涂层。研究了涂层的结合强度、隔热性能和抗热震性能。实验结果表明：拉伸断裂发生在莫来石涂层内，涂层的平均结合强度约为5．63MPa；稳态测量涂层隔热温度，当涂层表面温度为400℃～800℃时，涂层的隔热温度变化范围为11．5℃～40℃；热震温度为400℃～800℃间隔100℃时，涂层的抗热震次数分别为165、135、117、81和34次；涂层先从试样边沿开始剥落，并呈加速剥落的趋势。涂层失效主要原因是由于热震过程中残余应力积聚造成的。The hollow mullite thermal barrier coatings were deposited by Micro-plasma Spraying technique. The bond strength, thermal barrier capability and the anti-thermal shock ability of the coating were tested. The tested results show that the average bond strength of the coating is 5.63 MPa, the fracture begins in the top coating; The thermal barrier of the coatings goes up form 11.5 ℃ to 40 ℃ under the surface temperature going up form 400 ℃ to 900 ℃ conditions in which the steady-state test is employed; the anti-thermal shock times are 165, 135, 117, 81, and 34 when the test temperature is between 400 ℃ and 800 ℃ with interval of 100 ℃ ; the initial spallation of the mullite coating occurs at the edge of the specimen, and its speed increases at the end of thermal shock life. The main failure reason of the coatings is the thermal residual stress accumulated during the thermal shock test.

关 键 词：材料表面与界面 微弧等离子喷涂 莫来石 隔热涂层 结合强度 抗热震性能 

分 类 号：TG142[一般工业技术—材料科学与工程] TB43[金属学及工艺—金属材料]