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。
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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2011年第2期179-184,共6页
Acta Materiae Compositae Sinica
基金
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
关键词
热障涂层
稀土氧化物
掺杂
YSZ
热导率
thermal barrier coatings（TBCs）
rare earth oxide
doping
yttria stabilized zirconia（YSZ）
thermal conductivity
