摘要
Y2O3部分稳定的ZrO2(YPSZ)陶瓷涂层与高温合金基体间的特性差异较大,极易产生高的残余应力从而导致涂层脱落失效。为此,本文通过ANSYS有限元模拟方法对热喷涂YPSZ陶瓷涂层的温度场和残余应力进行了研究,结果表明:热喷涂过程中,YPSZ熔滴以一定速度在无限大MCrAlY合金表面沉积后,其温度场呈梯度分布;发生散流变形的同时与底层有热交换作用,最终凝固成圆片状固体颗粒;2000μs左右,YPSZ颗粒与底层的温度趋于一致,此时,熔滴中心轴线上的径向应力呈几乎线性分布,而轴向应力则呈非对称的近抛物线型分布;残余应力的极大与极小值都出现在边缘附近。
Due to the larger characteristic difference between the Y203 partially stabilized ZrO2 （YPSZ） ceramic coating and superalloy substrate, it is easy to produce high residual stress which lead to failure of coating. Therefore the temperature field and residual stress of thermal sprayed YPSZ ceramic coating are studied by using ANSYS finite element simulation method. The results show that the temperature filed distribution is gradient after the YPSZ droplet with a certain speed deposited on an infinite MCrAIY alloy surface. And it occur diffuser deformation meanwhile with the heat transfer with the bottom. It translates the solidified disc solid particle finally. The temperature of the YPSZ particle is going to the same with that of the bottom at about 2000 ps. Meanwhile the radial stress on the central axis of the droplet is almost linear distribution, while the axial stress is non-symmetrical parabolic distribution. The maximum and minimum values of the residual stress occur near the edge.
出处
《热喷涂技术》
2010年第4期41-44,共4页
Thermal Spray Technology
关键词
YPSZ陶瓷
热障涂层
热喷涂
有限元模拟
残余应力
YPSZ ceramic
Thermal barrier coating
Thermal spraying
Finite element simulation
Residual stress
