稀土氧化物RE2O3(RE=La,Ce,Gd,Yb)掺杂氧化钇稳定氧化锆气凝胶相稳定性与晶粒生长分析  

Phase Stability and Grain Growth of Rare Earth Oxide RE2O3(RE=La,Ce,Gd,Yb)Doped Yttrium Stabilized Zirconia Aerogel

作　　者：于长清[1] 余悠然 赵英民[1] 巢雄宇 袁武华[2] YU Changqing;YU Youran;ZHAO Yingmin;CHAO Xiongyu;YUAN Wuhua(Aerospace Institute of Advanced Materials & Processing, Beijing 100074, China;School of Materials Science and Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]航天特种材料及工艺技术研究所,北京100074 [2]湖南大学材料科学与工程学院,长沙410082

出　　处：《硅酸盐通报》2020年第5期1620-1626,共7页Bulletin of the Chinese Ceramic Society

摘　　要：本文采用超临界干燥技术与溶胶-凝胶法制备了无裂纹、块状RE2O3(RE=La,Ce,Gd,Yb)掺杂Y2O3稳定ZrO2(RE-YSZ)气凝胶。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和比表面积分析仪等工具研究了RE-YSZ气凝胶的相稳定性和晶体生长行为。结果表明,具有较大阳离子半径稀土元素的掺杂可阻碍热处理过程中的原子扩散,因此所得的YSZ气凝胶具有较高的热稳定性、较小的晶粒尺寸和较大的比表面积。Bulk RE2O3(RE=La,Ce,Gd,Yb)doped stable Y2O3 aerogel was prepared by supercritical drying technique and sol-gel method.The phase stability and crystal growth behavior of RE-YSZ aerogel were studied by means of X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM)and specific surface area analyzer.The results show that doping of large cationic rare earth elements can hinder the atomic diffusion during heat treatment,therefore,YSZ aerogel with large cation doping have higher thermal stability,lower grain size and larger specific surface area.

关 键 词：YSZ气凝胶 RE2O3 相转变 晶粒生长 热稳定性 

分 类 号：TQ174[化学工程—陶瓷工业]