In this paper, La₂O₃, Gd₂O₃, and Yb₂O₃ co-doped yttria stabilized zirconia (LGYYSZ) thermal barrier coatings were prepared on a nickel-based superalloy by atmospheric plasma spraying. The phase stability, coefficient of thermal expansion (CTE), and thermal conductivity of the LGYYSZ and YSZ coatings were measured. Thermal cycling at 1400 °C was implemented to evaluate the feasibility of LGYYSZ as an optimal ceramic material for thermal barrier coatings (TBCs) of next-generation gas turbines. The results show that the LGYYSZ coating exhibits a stable cubic phase, even after annealing at 1500 °C for 100 h. The CTE of LGYYSZ is slightly higher than that of YSZ. The thermal conductivity of the LGYYSZ coating at 1400 °C is 1.08 W∙m⁻¹∙K⁻¹, which is ~26.5% lower than that of YSZ. The thermal cycling lifetime of the LGYYSZ coating at 1400 °C is 468 cycles, which is ~2.7 times that of the YSZ coating. The longer thermal cycling life of the LGYYSZ TBC can be attributed to the excellent phase stability and lower thermal conductivity.

本文中，La ₂ O ₃，Gd ₂ O ₃和Yb ₂ O ₃通过大气等离子喷涂在镍基高温合金上制备了共掺杂的氧化钇稳定的氧化锆（LGYYSZ）热障涂层。测量了LGYYSZ和YSZ涂层的相稳定性，热膨胀系数（CTE）和热导率。实施了在1400°C下的热循环，以评估LGYYSZ作为下一代燃气轮机热障涂层（TBC）的最佳陶瓷材料的可行性。结果表明，即使在1500°C退火100 h后，LGYYSZ涂层也表现出稳定的立方相。LGYYSZ的CTE略高于YSZ。LGYYSZ涂层在1400°C时的热导率为1.08 W∙m ^-1 ∙K ^-1，比YSZ低26.5％。LGYYSZ涂层在1400°C的热循环寿命为468个循环，是YSZ涂层的约2.7倍。LGYYSZ TBC的更长的热循环寿命可归因于出色的相稳定性和较低的导热率。