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采用等离子喷涂制备了La_2(Zr_(0.7)Ce_(0.3))_2O_7(LZ7C3)热障涂层,并对涂层的微观组织、相结构、成分、相稳定性、涂层热导率以及抗热震性能进行了研究.结果表明,LZ7C3涂层由单相烧绿石结构物质组成,高温稳定性较好;涂层的热导率较块材下降约20%,这是由于涂层具有较高的孔隙率所致:涂层在不同温度范围的热震寿命和失效机制不同,在室温至约1000℃间的热震寿命为116 cyc,涂层失效方式以片状剥落为主:在室温至1100℃间的热震寿命为53 cyc,涂层失效方式为片状剥落和层状撕裂;在室温至1200℃间的热震寿命为3 cyc,涂层失效方式以层状撕裂为主.
The La2 (Zr0.7 Ce0.3) _2O_7 (LZ7C3) thermal barrier coatings were prepared by plasma spraying. The microstructure, phase structure, composition, phase stability, coating thermal conductivity and thermal resistance The results show that the LZ7C3 coating is composed of single-phase pyrochlore structure and has good high temperature stability. The thermal conductivity of the coating is about 20% lower than that of the block due to the higher coating : The thermal shock life and failure mechanism of the coatings are different in different temperature ranges, and the thermal shock life is 116 cyc at room temperature to about 1000 ℃. The coating failure mode mainly consists of exfoliation: from room temperature to The thermal shock life at 1100 ℃ is 53 cyc. The failure modes are flaking and lamellar tearing. The thermal shock life is 3 cyc between room temperature and 1200 ℃. .