Thermal-physical performances of novel pyrochlore-type Ca3Ln3Ce7Ta2O26.5(Ln = Nd and Dy) oxides

被引：3
|
作者：
Zhang Hongsong [1 ]
Feng Yan [2 ]
Tong Yuping [3 ]
Sang Weiwei [1 ]
Zhao Yongtao [1 ]
Yan Xianfeng [4 ]
Tang An [1 ]
机构：
[1] Henan Univ Engn, Dept Mech Engn, Zhengzhou 451191, Peoples R China
[2] Zhengzhou Railway Vocat & Tech Coll, Sch Elect Engn, Zhengzhou 451460, Peoples R China
[3] North China Univ Water Resources & Elect Powder, Sch Mat Sci & Engn, Zhengzhou 450011, Peoples R China
[4] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410014, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2020年 / 46卷 / 08期
基金：
中国国家自然科学基金;
关键词：
High-temperature applications; Pyrochlore lattices; Coefficients of thermal expansion; Thermal conductivities; BARRIER COATING MATERIAL; THERMOPHYSICAL PROPERTIES; SM; CERAMICS; GD; LA; CONDUCTIVITY; SCATTERING; X=0; EU;
D O I：
10.1016/j.ceramint.2020.01.027
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：
To identify candidates for thermal barrier coatings, two complicated oxides, Ca(3)Nd(3)Ce(7)Ta(2)O(26.5 )and Ca3Dy3Ce7Ta2O2.65, were prepared via a high-temperature sintering method. The lattice-type and thermal physical properties of these two oxides were studied. The obtained products have a single pyrochlore-type lattice. Because of the high atomic weights, complex element compositions, and complicate lattice structures, the thermal conductivities of the obtained products are lower than that of the yttria-stabilized zirconia (YSZ). The thermal conductivity of Ca3Dy3Ce7Ta2O26.5 is lower than that of Ca3Nd3Ce7Ta2O26.5. The coefficients of thermal expansion for Ca(3)Ln(3)Ce(7)Ta(2)O(26.5) (Ln = Dy and Nd) oxides at 1473 K are approximately 11.92 x 10(-6)/K and 12.1 x 10(-6)/K, respectively. The thermal conductivities and expansion coefficients of these two oxides meet the demands for thermal barrier coatings.
引用
收藏
页码：11416 / 11420
页数：5
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