Defects in the grain interiors of 3 mol%yttria-stabilized tetragonal zirconia polycrystal ceramics with 0.25 wt%alumina  

作　　者：Yan Xiong Lian Luo Yao Cheng Zhi Liu Qi Liu Weimin Wang Wei Ji 

机构地区：[1]School of Materials&Chemical Engineering,Hubei Province Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China [2]Fujian Institute of Research on the Structure of Mater,Chinese Academy of Sciences,Fuzhou 350002,China [3]Jiangxi Provincial Engineering Research Center for Multifunction Zirconia Materials,Jiangxi Size Materials Co.,Ltd.,Jiujiang 332500,China [4]State Key Laboratory of Advance Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Advanced Ceramics》2024年第4期469-477,共9页先进陶瓷（英文）

基　　金：the National Key R&D Program of China(No.2021YFB3701400);the National Natural Science Foundation of China(Nos.92163208 and 52322207);the Foundation of Hubei Province Key Laboratory of Green Materials for Light Industry,Hubei University of Technology.

摘　　要：The presence of high-density defects is rarely observed in bulk 3 mol%yttria-stabilized tetragonal zirconia polycrystal(3Y-TZP)ceramics obtained through conventional pressureless sintering.In the present work,fine-grained dense 147 nm 3Y-TZP ceramics were prepared by pressureless sintering of commercial 0.25 wt%alumina-doped zirconia powders at 1300℃.A novel discovery was reported in which large amounts of defects were present in the grain interiors of the sample.The phenomenon was further examined using three types of powder samples,and the reasons for defect formation were investigated by microstructural characterization using high-resolution transmission electron microscopy(HRTEM)analysis and Rietveld refinement.The results confirmed the essential dependence of the defect formation on the alumina addition.The authors attributed the defect formation to the significant difference in ionic radii of the solvent and solute during the dissolution of alumina into the zirconia lattice.The sintering kinetics were proposed to be enhanced by the presence of substantial defects,which consequently favored the low-temperature sintering of the alumina-doped zirconia ceramics.

关 键 词：3 mol%yttria-stabilized tetragonal zirconia polycrystal(3Y-TzP)ceramics alumina addition microstructure defect 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]