Densification, Structure, and Thermophysical Properties of Ytterbium-Gadolinium Zirconate Ceramics

被引：45
作者：
Liu, Zhan-Guo [1 ]
Ouyang, Jia-Hu [1 ]
Zhou, Yu [1 ]
Li, Jing [1 ]
Xia, Xiao-Liang [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci, Inst Adv Ceram, Harbin 150001, Peoples R China
来源：
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2009年 / 6卷 / 04期
关键词：
THERMAL-BARRIER COATINGS; CONDUCTIVITY; EXPANSION; LANTHANUM;
D O I：
10.1111/j.1744-7402.2008.02289.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
(YbxGd1-x)(2)Zr2O7 (0 <= x <= 1.0) ceramic powders synthesized with the chemical-coprecipitation and calcination method were pressureless-sintered at 1550-1700 degrees C to develop new thermal barrier oxides with a lower thermal conductivity than yttria-stabilized zirconia ceramics. (YbxGd1-x)(2)Zr2O7 ceramics exhibit a defective fluorite-type structure. The linear thermal expansion coefficients of (YbxGd1-x)(2)Zr2O7 ceramics increase with increasing temperature from room temperature to 1400 degrees C. The measured thermal conductivity of (YbxGd1-x)(2)Zr2O7 ceramics first gradually decrease with increasing temperature and then slightly increase above 800 degrees C because of the increased radiation contribution. YbGdZr2O7 ceramics have the lowest thermal conductivity among all the composition combinations studied.
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收藏
页码：485 / 491
页数：7
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