The effect of the critical plasma spraying parameters (CPSPs) on thermal shock resistance of plasma-sprayed LaMgAl₁₁O₁₉ coatings with thickness of 800 μm was investigated. With the CPSPs value decreased from 1.20 to 0.86, thermal cycling lifetime of the LMA coatings increased from 2571 ± 245 to 3394 ± 78 cycles during testing at 900 °C, while it increased from 300 ± 79 to 702 ± 78 cycles during testing at 1100 °C. Based on the simulation results, the normal tensile stress S₁₁ concentrated along the bond coat/top coat interface was decreased from 788.20 to 533.94 MPa with the decreasing CPSPs during the first cycle, while the normal tensile stress S₂₂ concentrated at the end of the interface reduced from 310.32 to 74.51 MPa after 10 cycles. As a result, the improvement of thermal shock resistance of coating would be attributed to the combined effects of the decrease in tensile stress S₁₁ and S₂₂, while the stress accumulation and volume shrinkage induced by the recrystallization of amorphous phase were the main factors of coating failure.

研究了等离子喷涂临界参数(CPSPs)对800 μm厚度等离子喷涂LaMgAl ₁₁ O _{19涂层抗热震性能的影响。}随着CPSPs值从1.20降低到0.86，LMA涂层的热循环寿命在900°C测试期间从2571±245增加到3394±78个循环，而在1100°C测试期间从300±79增加到702±78个循环°C。根据模拟结果，随着第一周期CPSP的减少，沿着粘结层/面漆界面集中的法向拉应力S _{11从788.20下降到533.94 MPa，而法向拉应力S 22}10次​​循环后，界面末端的集中压力从310.32下降到74.51 MPa。因此，涂层抗热震性能的提高是拉应力S ₁₁和S ₂₂降低的综合作用，而非晶相再结晶引起的应力积累和体积收缩是其主要影响因素。涂层失效。