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| Research Status of Atmospheric Plasma Spraying YSZ Thermal Barrier Coating Internal Stress |
| ZHAO Yuantao 1,2,3 , ZHANG Shitao 1 , JIANG Tao 1 , GUO Leyang 1 , ZHANG Yangyang 1 , LI Wenge 1 , LIU Yanbo 1 , ZHANG Jing 2 |
1. Shanghai Maritime University, Shanghai 201306, China;
2. Shanghai Nanotechnology Promotion Center, Shanghai 200237, China;
3. Shanghai University, Shanghai 200444, China |
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Abstract The preparation of yttrium-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) using atmospheric plasma spraying (APS) has been extensively investigated. Internal stress is a major factor affecting the performance and service life of TBCs systems. Excessive internal stresses can cause the development and expansion of microcracks and lead to premature failure of YSZ TBCs. Early internal stresses are mainly caused by poor selection of the coating process, substrate and powder conditions, and cause early crack initiation and extension. High temperature phase changes in ZrO2 , thermal growth oxide (TGO) growth and coefficient of thermal expansion (CTE) mismatch between ceramic and metallic materials are the main sources of internal stresses in TBCs in thermal service. Under internal stress, cracks sprout at the surface ceramic working layer (TC)/TGO or bonding layer (BC)/TGO interface, expand and lead to coating peeling failure. The main ideas to reduce the internal stresses in the system in order to extend the thermal service life of TBCs are to interfere with spinel TGO generation, to prepare composite coatings or to stabilise the ZrO2 phase structure with rare earth particles.
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2022, 
