表面陶瓷层厚度对Sm2Zr2O7/8YSZ热障涂层热冲击性能的影响

张红松<sup>1</sup>; 时蕾<sup>2</sup>

引用本文:	张红松，时蕾.表面陶瓷层厚度对Sm₂Zr₂O₇/8YSZ热障涂层热冲击性能的影响[J].中国表面工程,2013,26(2):76~81
	ZHANG Hong-song, SHI Lei.Influence of Surfacelayer Thickness on Thermalshocking Property of Sm₂Zr₂O₇/8YSZ Thermal Barrier Coatings[J].China Surface Engineering,2013,26(2):76~81

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表面陶瓷层厚度对Sm₂Zr₂O₇/8YSZ热障涂层热冲击性能的影响
张红松，时蕾^1,2
1. 河南工程学院机械工程系，郑州 451191;2. 郑州铁路职业技术学院机车车辆系，郑州 450007

摘要:

稀土锆酸盐与8YSZ所组成的双陶瓷层涂层是目前热障涂层领域研究的热点，而陶瓷层厚度对其热冲击性能有着显著影响。采用有限元软件ANSYS研究了表层厚度对Sm₂Zr₂O₇/8YSZ热障涂层淬冲击热应力的影响，并与单一Sm₂Zr₂O₇涂层进行了比较。结果表明，在Sm₂Zr₂O₇/8YSZ涂层的表面处具有最大的径向热冲击应力，最大轴向应力则存在于陶瓷层/金属粘结层界面处，涂层各处剪应力基本相当。涂层表面及两陶瓷层界面处的径向热应力随表层厚度的增加而减小，陶瓷层/粘结层界面处径向应力则随表层厚度增加而增大。每个界面处的轴向应力随表层厚度增加而降低，而剪应力绝对值则随表层厚度增加而增大。与单一Sm₂Zr₂O₇涂层相比，Sm₂Zr₂O₇/8YSZ涂层的热应力明显偏小，说明增加涂层的层数有利益改善涂层的抗热冲击性能。

关键词: 热障涂层有限单元法热冲击性能热应力

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Influence of Surfacelayer Thickness on Thermalshocking Property of Sm₂Zr₂O₇/8YSZ Thermal Barrier Coatings

ZHANG Hong-song, SHI Lei^1,2

1. Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 451191;2. Department of Locomotive and Rolling Stock, Zhengzhou Railway Vocation Technical College, Zhengzhou 450007

Abstract:

Double-ceramic-layer thermal barrier coatings (TBCs) of rare earth zirconates and 8% yttria stabilized zirconia are the focal point. Thickness of surface-layer has an important impact on the thermal-shocking property of TBCs. The influence of surface-layer thickness on water-quenching thermal stress in Sm₂Zr₂O₇/8YSZ thermal barrier coating was investigated by ANSYS, compared with that in single Sm₂Zr₂O₇ coating. The results indicate that the highest radial thermal stress exists on the surface of Sm₂Zr₂O₇/8YSZ TBCs, and the highest axial thermal stress exists at ceramic-layer/bonding coat interface, however, shear stresses at different locations in TBCs are in the same order. Radial stress at top-surface and interface between two ceramic-layers reduces gradually with increasing surface-layer thickness, however, the radial stress at the ceramic-layer/bonding coat interface is proportional to the surface-layer thickness. Axial stress at each interface is inverse-proportional to the thickness of the surface-layer, however, the absolute value of shear thermal stress increases with increasing thickness of the surface-layer. Thermal stress in double-ceramic-layer TBCs is lower than that in single-cerami-clayer TBCs. Increasing number of the layer can improve the thermalshocking property of thermal barrier coatings.

Key words: thermal barrier coatings finite element method thermalshocking property thermal stress