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.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第8期1108-1113,共6页
Acta Armamentarii
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
suface and interface for the material
micro-plasma spray
mullite
thermal barrier coatings
bond strength
thermal shock resistant