La₂Ce₂O₇ (LC) is receiving increasing attention due to its lower thermal conductivity, better phase stability and higher sintering resistance than yttria partially stabilized zirconia (YSZ). However, the low fracture toughness and the sudden drop of CTE at approximately 350 °C greatly limit its application. In this study, the LC/50 vol.% YSZ composite TBC was deposited by supersonic atmospheric plasma spraying (SAPS). Compared to YSZ or double layered LC/YSZ coating, the thermal cycling life of LC/50 vol.% YSZ coating with CMAS attack increased by 93% or 91%. The latter possessed higher fracture toughness (1.48 ± 0.26 MPa m^1/2) than LC (0.72 ± 0.15 MPa m^1/2) and better CMAS corrosion resistance than YSZ owing to the formation of Ca₂(La_xCe_1-x)₈(SiO₄)₆O_6–4x with <001> orientation perpendicular to the coating surface. The sudden CTE decrease of LC was fully suppressed in LC/50 vol.% YSZ coating due to the change of temperature dependent residual stresses induced by YSZ.

与氧化钇部分稳定的氧化锆（YSZ）相比，La ₂ Ce ₂ O ₇（LC）具有较低的导热性，更好的相稳定性和更高的耐烧结性，因此受到越来越多的关注。但是，低的断裂韧性和CTE在大约350°C时突然下降极大地限制了其应用。在这项研究中，LC / 50％（体积）YSZ复合TBC通过超音速大气等离子喷涂（SAPS）沉积。与YSZ或双层LC / YSZ涂层相比，具有CMAS腐蚀的LC / 50 vol。％YSZ涂层的热循环寿命增加了93％或91％。后者具有比LC（0.72±0.15 MPa m ^1/2）更高的断裂韧性（1.48±0.26 MPa m ^1/2）），因为形成了垂直于涂层表面的<001>取向的Ca ₂（La _x Ce _1-x）₈（SiO ₄）₆ O _6–4x，因此比YSZ具有更好的CMAS耐腐蚀性。由于YSZ引起的温度相关残余应力的变化，在LC / 50％（体积）的YSZ涂层中，LC的突然CTE降低得到了完全抑制。