去应力退火对等离子喷涂ZrO_2-NiCoCrAlY热障涂层热震性能的影响

Effect of Stress Relief Annealing on Thermal Shock of ZrO_2-NiCoCrAlY Thermal Barrier Coating by Plasma-Spraying

研究了等离子喷涂 Zr O2 - Ni Co Cr Al Y不同结构热障涂层的硬度分布及 80 0℃和 10 0 0℃温度下的热震性能。并进一步研究了去应力退火对涂层热震性能的影响。结果表明 ,与非梯度涂层相比 ,梯度涂层具有较平缓的硬度分布 ,不存在金属与陶瓷层界面间的硬度突变。热循环温度增加 ,使抗热震性降低 ,但梯度涂层在两种温度下均具有较高的抗热震性。

In this paper, the microhardness distribution and thermal shock resistance at 800℃and 1000℃ of ZrO 2 NiCoCrAlY plasma sprayed thermal barrier coating with different structure were studied Furthermore, the effect of stress relief annealing on thermal shock resistance of coating was investigated The results show that the graded coating has gradual microhardness distribution and has not sharp change of microhardness at the interface between metal and ceramic layer in comparison with non graded coating The thermal shock resistance will drop when the thermal cycling temperature is elevated But the graded coatings always have better thermal shock resistance at 800℃ and 1000℃ It is found that the thermal shock resistance can be raised remarkably by the stress relief annealing