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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
引用本文:张丹华,王璐,郭洪波,宫声凯. 多元稀土氧化物掺杂二氧化锆基陶瓷材料的热物理性能[J]. 复合材料学报, 2011, 28(2): 179-184
作者姓名:张丹华  王璐  郭洪波  宫声凯
作者单位:1.北京航空航天大学 材料科学与工程学院, 北京 100191;
基金项目:国家自然科学基金(50771009,50731001); 新世纪优秀人才计划; 高等学校博士学科点专项科研基金
摘    要: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0.90~1.15 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。 

关 键 词:热障涂层   稀土氧化物   掺杂   YSZ   热导率
收稿时间:2010-06-14

Thermophysical properties of multiple rare earth oxide co-doped zirconia-based ceramic materials
ZHANG Danhua,WANG Lu,GUO Hongbo,GONG Shengkai. Thermophysical properties of multiple rare earth oxide co-doped zirconia-based ceramic materials[J]. Acta Materiae Compositae Sinica, 2011, 28(2): 179-184
Authors:ZHANG Danhua  WANG Lu  GUO Hongbo  GONG Shengkai
Affiliation:1.School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2.AVIC Shenyang Liming Aero-engine (Group) Corporation Ltd., Shenyang 110043, China
Abstract:Rare earth (RE) oxides doping yttria stabilized zirconia (YSZ) is an effective path to improve the thermal-resistance and high-temperature stability of traditional ceramic YSZ thermal barrier coatings. Gd2O3-Yb2O3 co-doped YSZ (contain 3.5%Y2O3, mole fraction) (GY-YSZ) was prepared by sintering at 1500 ℃ for 24 h. The crystal structure and phase composition of the GY-YSZ were studied by XRD analysis. Laser flash method was used to investigate the effects of doping rare earth oxides on the thermophysical property of GY-YSZ. The results show that the thermal conductivity of the GY-YSZ doped with 2.0%~3.0% mole fraction of Gd2O3 and Yb2O3 is 0.90~1.15 W·(m·K)-1, which is reduced by 30% at least than that of YSZ and proves the higher thermal-resistance property of the GY-YSZ. The influence mechanism of doping rare earth oxides on the thermal physical property of YSZ is that co-doping with Gd2O3 and Yb2O3 results in lattice distortion and content variation of monoclinic phase (M), tetragonal phase (T) and cubic phase (C) in YSZ. 
Keywords:thermal barrier coatings(TBCs)  rare earth oxide  doping  yttria stabilized zirconia(YSZ)  thermal conductivity  
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