Characterization of YSZ Ceramic Nanopowders Synthesized at Different Temperatures via Polyacrylamide Gel Method  

作　　者：LIU Ting CHEN Weidong JU Hongmin YAN Shufang MA Wen 刘婷;陈伟东;JU Hongmin;YAN Shufang;MA Wen(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Thin Film and Coatings,Hohhot 010051,China)

机构地区：[1]School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China [2]Inner Mongolia Key Laboratory of Thin Film and Coatings,Hohhot 010051,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第3期528-534,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51964035);the Natural Science Foundation of Inner Mongolia Autonomous Region(No.2019MS0520)。

摘　　要：Tetragonal zirconia (T-ZrO2) ceramic nanopowders stabilized with 3 mol% Y2O3 were synthesized via polyacrylamide gel method, using ZrOCl2?8H2O and Y(NO3)3?6H2O as raw materials. The effect of temperature on phase composition and morphology of YSZ nanopowders and sintering behavior of YSZ ceramics was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Vickers hardness tester. The aging-resistance of YSZ ceramics was measured by means of aging experiments. The results demonstrated that the phase composition of YSZ ceramic nanopowders had no obvious change and it was composed of T-ZrO2. Particle size of well-dispersed YSZ ceramic nanopowders increased from 17 to 35 nm with increasing calcining temperature from 600 to 800 ℃. There was noticeable negative correlation between calcining temperature and the relative density of YSZ ceramic at the same sintering temperature. The aging experiments showed that water vapor facilitated tetragonal to monoclinic phase transformation, and the sample that had smaller grain size exhibited better aging-resistance. It can be concluded that when the calcining temperature is 600 ℃ and sintering temperature is 1550 ℃, the relative density and hardness of YSZ ceramic arrive at the peak of 96.64% and 11.135 GPa respectively, and it has less microcracks and excellent aging-resistance.

关 键 词：YSZ nanopowders polyacrylamide gel method sintering behavior aging-resistance grain size 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ174.75[化学工程—陶瓷工业]