Effects of Er^(3+)doping on structure and thermal properties of(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)ceramics for thermal barrier coating  

作　　者：Min Xie Shengli An Xiwen Song Jinxiao Bao Fen Zhou 

机构地区：[1]School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China [2]Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices,Baotou 014010,China

出　　处：《Journal of Rare Earths》2022年第12期1920-1926,I0004,共8页稀土学报（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China(2015AA034403);National Natural Science Foundation of China(51762036);The Science and Technology Program of Inner Mongolia(2019)。

摘　　要：Rare earth Er^(3+)doped(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)(x=0.1,0.2,and 0.3)ceramic samples were synthesized using a solid state reaction method.The microstructure and thermal properties of these ceramics were investigated to evaluate their potential as thermal barrier coating materials.The results show that ceramics are compact with regular-shaped grains of 1-5μm size.(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)has a pyrochlore structure mainly determined by ionic radius ratio,but the ordering degree decreases with increase of the Er_(2)O_(3)content.There is no phase transformation from 1000 to 1200℃,and the(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)ceramics exhibit excellent phase stability during thermal treatment at 1200℃for 100 h and 1400℃for 50 h.The thermal conductivities of dense(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)ceramics range from 1.52 to 1.59 W/(m·K),which is lower than that of Sm_(2)Zr_(2)O_(7),and decrease as the Er2O3content increases.Besides,the thermal expansion coefficient of(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7)is higher than that of Sm_(2)Zr_(2)O_(7).

关 键 词：(Sm_(1-x)Er_(x))_(2)Zr_(2)O_(7) Pyrochlore structure Thermal-physical properties Er^(3+)doping Rare earths 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TQ174.1[金属学及工艺—金属学]