目的 为了探究玻璃沉积物CMAS(CaO-MgO-Al2O3-SiO2)对新型结构热障涂层在1250 ℃下的热冲击寿命的影响，揭示热障涂层的失效行为。方法 通过火焰喷涂技术将制备的CMAS粉体均匀地沉积到铈酸镧/氧化钇部分稳定二氧化锆双陶瓷层热障涂层(LC/YSZ DCL-TBCs)和梯度热障涂层(LC/YSZ FGM-TBCs)的表面，于1250 ℃热冲击实验中进行涂层样品的抗热冲击性能及失效机理研究。利用扫描电镜(SEM)和能谱仪(EDS)追踪CMAS的位置，观察CMAS与涂层反应层的厚度与形貌。采用X射线衍射仪(XRD)测试反应层产物，并总结其失效方式。结果 高温热冲击结果显示梯度涂层的热冲击寿命(435次)远高于双陶瓷层热障涂层的寿命(229次)，约为铈酸镧/氧化锆双陶瓷层热障涂层寿命的1.9倍。铈酸镧层与梯度层都能在一定程度上阻碍CMAS渗入涂层内部，提高其CMAS腐蚀条件下的热冲击寿命。双陶瓷层热障涂层与梯度热障涂层的失效均是以层状剥落为主，剥落层主要是CMAS与LC的反应层以及反应层下的烧结层，反应层是由Ca2(LaxCe1-x)8(SiO4)6O6-4x、萤石相和MgAl2O4等难熔氧化物组成，这层致密氧化物类似于密封层，能阻止CMAS继续渗入。结论 功能梯度结构具有比双陶瓷层结构更优异的抗CMAS热冲击性能和更好的应力耐受性。

The work aims to explore the influence of glass deposits CMAS (CaO-MgO-Al2O3-SiO2) on the thermal shock life of the new structure thermal barrier coatings (TBCs) at 1250 ℃ and reveal the failure behavior of these coatings. CMAS powder was uniformly deposited on the surface of LC double ceramic thermal barrier coating (LC/YSZ DCL-TBCs) and gradient thermal barrier coating (LC/YSZ FGM-TBCs) by flame spraying technology. The thermal shock resistance and failure mechanism of the coating samples were tested by thermal shock experiment at 1250 ℃. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to track the location of CMAS and observe the thickness and morphology of CMAS and the reaction layer. X-ray diffractometer (XRD) was used to test the phase composition of the reaction layer and the coatings failure modes were summarized. The thermal shock results showed that the thermal shock life of the FGM-TBCs (435 times) was much higher than that of the DCL-TBCs (229 times), which was about 1.9 times longer than that of La2Ce2O7/YSZ DCL-TBCs. Both cerium lanthanum oxide layer and gradient layer could prevent CMAS from infiltrating into the coating to some extent and improve the thermal impact life under CMAS corrosion condition. The failure of two TBCs was mainly caused by layered spalling. The spalling layer were mainly the reaction layer of CMAS and LC, which generated refractory oxides such as Ca2(LaxCe1-x)8(SiO4)6O6-4x, fluorite phase and MgAl2O4, and the sintered layer under the reaction layer. This dense oxide layer was similar to the sealing layer and could prevent CMAS from further infiltration. The above results show that the FG-TBCs have better CMAS thermal shock resistance and better stress tolerance than the DCL-TBCs.