中文摘要：

采用超音速火焰喷涂（HVOF）在高温合金K4169上制备了NiCoCrAlYTa黏结层，使用不同粒度的氧化铝对黏结层进行喷砂预处理制备出1广小同粗糙度的黏结层，再通过大气等离子喷涂（APS）在不同粗糙度的黏结层上制备了ZrO2-7％Y2O3（7YSZ）热障涂层（TBCs）。对不同粗糙度的黏结层表面采用体视镜进行观察分析；并对不同粗糙度下制备的热障涂层的高温氧化性能、热震性能、表面硬度、结合强度等进行了测试以及对它们的变化规律进行了对比分析。此外，对热震失效后热障涂层的黏结层与陶瓷层界面进行了残余应力分析，计算了热生长层（TGO）裂纹尖端应力场强度㈤。研究结果表明：黏结层粗糙度越大，热障涂层中黏结层的氧化质量增加，黏结层与陶瓷层界面残余应力增加；当黏结层粗糙度为3.52μm时，热障涂层有最优的综合性能，其中结合强度和热震次数分别为57MPa和52次（950℃到22℃循环）。

英文摘要：

The paper was to investigate the effect of bond coating roughness on the high-temperature behavior and mechanical properties in ZrO2-7%Y2O3 （7YSZ） thermal barrier coatings （TBCs） prepared by air plasma spray （APS）. The bond coating surface of NiCoCrAIYTa prepared by high velocity oxygen flame （HVOF） was blasted by different sized A1203 grits to form different surface roughnesses before the ceramic deposition. The bond coating surfaces were observed by a 3-D optical microscope. The properties of TBCs like oxidation resistance, thermal shock property, bond strength, and residual stress were measured. The roughness of the bond coating affects the lifetime of TBCs. The mass gain increases evidently with increasing the roughness of the bond coating. When the bond coating roughness is 3.52 μm, the TBCs have the longest lifetime （52 thermal cycles）, and the bond strength is 57 MPa. Besides, the stress intensity factor of crack tip （K） at interface between bond coating and ceramic coating in TBCs was calculated.