采用等离子喷涂铈酸镧(La2Ce2O7,LC)粉末制备了铈酸镧热障涂层(TBCs).由于等离子喷涂过程中CeO2的挥发量较多,造成涂层的实际成分为La2Ce1.66O4.32,与原始粉末成分相比有所偏离.在1400℃下经240h热处理后LC涂层发生轻微的分解.在1000℃下LC块材的热导率约为0.51W/(m*K),比传统的氧化钇部分稳定的氧化锆(YSZ)块材的热导率降低了约75%.LC涂层的热膨胀系数(CTE)在450～1100℃范围内介于10×10-6～13×10-6K-1,与相应温度范围内的YSZ相比较高.热膨胀性能测量表明,LC涂层从室温升到1250℃时发生轻微的烧结,在1250℃保温过程发生明显的烧结现象.LC热障涂层在1100℃条件下经60次热循环后从陶瓷层内部发生剥落.
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