多元稀土氧化物掺杂二氧化锆基陶瓷材料的热物理性能

复合材料学报, 2011, 28(2): 179-184.

多元稀土氧化物掺杂二氧化锆基陶瓷材料的热物理性能

张丹华 ^1, , 王璐 ^2, , 郭洪波 ^3, , 宫声凯 ^4,

1.北京航空航天大学材料科学与工程学院,北京,100191

2.中航工业沈阳黎明航空发动机(集团)有限责任公司,沈阳,110043

3.北京航空航天大学材料科学与工程学院,北京,100191

4.北京航空航天大学材料科学与工程学院,北京,100191

基金项目: 高等学校博士学科点专项科研基金新世纪优秀人才计划国家自然科学基金(50771009;50731001)

关键词：热障涂层 , 稀土氧化物 , 掺杂 , YSZ , 热导率

Thermophysical properties of multiple rare earth oxide co-doped zirconia-based ceramic materials

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℃高温同相反应烧结24 h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Gd2O.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0.90～1.15 W·(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GdzO3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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