Mechanical and thermal properties of RETaO4(RE=Yb,Lu,Sc)ceramics with monoclinic-prime phase  

作　　者：Lin Chen Mingyu Hu Jun Guo Xiaoyu Chong Jing Feng 

机构地区：[1]Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,People's Republic of China [2]School of Engineering,Brown University,Providence,Rl,02912,USA

出　　处：《Journal of Materials Science & Technology》2020年第17期20-28,共9页材料科学技术（英文版）

基　　金：under the support of the Natural Science Foundation of China(No.51762028,No.91960103);Materials Genome Engineering of Rare and Precious Metal of Yunnan Province(No.2018ZE019)。

摘　　要：As candidate thermal/environmental barrier coatings(T/EBCs),the structure characteristics and comprehensive properties of monoclinic-prime(m')RETaO4(RE=Yb,Lu,Sc)with excellent Al2O3/SiO2 chemical compatibility are studied.Excellent thermal insulation protection will be provided by m'RETaO4 due to their low thermal conductivity(~1.6 Wm^-1 K^-1,900℃)and prominent thermal radiation resistance,which is much better than those of YSZ(~2.5 Wm^-1 K^-1,1000℃)and La-12 Zr2O7(~2.0 Wm^-1 K,900℃).The thermal expansion coefficients(TECs)are 3.0–8.0×10^-6 K^-1(200-1200℃),which is suitable for T/EBCs applications.Furthermore,absence of phase transition and extraordinary chemical compatibility with Al2O3/SiO2 up to 1500℃indicate the potential application prospect.The documented governing mechanisms of m'RETaO4 properties will enable researchers to promote their application in the future investigation.

关 键 词：CERAMICS Thermal/environmental barrier coatings Rare earth tantalates Mechanical property Thermal conductivity Chemical compatibility 

分 类 号：TQ174.1[化学工程—陶瓷工业]