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多元稀土氧化物掺杂二氧化锆基陶瓷材料的热物理性能

, PP. 179-184

Keywords: 热障涂层,稀土氧化物,掺杂,YSZ,热导率

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Abstract:

稀土氧化物(RE)掺杂氧化钇稳定二氧化锆(YSZ)是提高传统YSZ热障涂层隔热性能和高温稳定性的有效途径之一。在1500℃高温固相反应烧结24h制得Gd2O3和Yb2O3多元稀土氧化物掺杂的YSZ(含3.5%Y2O3(摩尔分数))(GY-YSZ)陶瓷材料。采用XRD研究了GY-YSZ陶瓷材料的晶体结构和物相组成;采用激光脉冲法研究了Gd2O3和Yb2O3掺杂对GY-YSZ陶瓷材料的热物理性能的影响规律。研究发现,掺杂2.0%~3.0%Gd2O3和Yb2O3(摩尔分数)后GY-YSZ的热导率为0.90~1.15W·(m·K)-1,比YSZ降低30%以上,显示了良好的隔热性能。稀土氧化物掺杂对YSZ陶瓷材料热物理性能的影响机制为:掺杂Gd2O3和Yb2O3导致YSZ中单斜相(M)、四方相(T)和立方相(C)含量发生变化,同时YSZ晶格发生畸变。

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