摘要
以CaO和TiO2为原料,外加质量分数分别为0,1%,2%,3%,4%的Y_2O_3后,分别在1 300,1 400℃保温3h烧结制备CaTiO_3陶瓷,研究Y_2O_3掺杂量和烧结温度对陶瓷物相组成、晶体结构、烧结性能和微观结构的影响.结果表明:随着Y_2O_3掺杂量的增加,CaTiO_3的晶胞体积先增大后减小,Y^(3+)置换Ti^(4+)使CaTiO_3晶胞体积增大,置换Ca^(2+)则使晶胞体积减小;随Y_2O_3掺杂量的增加或烧结温度的升高,陶瓷的烧结线收缩率和体积密度均增大;随Y_2O_3掺杂量的增大,陶瓷的显微结构更为致密,CaTiO_3晶粒尺寸先增大后减小,晶粒形状由不规则台阶状转变为规则形状.
CaTiO3 ceramics were prepared at 1 300,1 400℃ for 3 hwith CaO and TiO2 as raw materials and being doped with 0,1 wt%,2 wt%,3 wt%,and 4 wt% Y2O3.The effects of Y2O3 doping amount and sintering temperature on the phase composition,crystal structure,sintering properties and microstructure of the ceramics were investigated.The results show that the cell volume of CaTiO3 first increased and then decreased with increasing Y2O3 doping amount.The substitution of Y3＋ for Ti4＋ increased the cell volume of CaTiO3 while the substitution of Y3＋ for Ca2＋ reduced the cell volume.With the increase of Y2O3 doping amount or the rise of sintering temperature,both the sintering linear shrinkage rate and the bulk density of the ceramics increased.With the increase of Y2O3 doping amount,the microstructure of the ceramics became denser,the size of CaTiO3 grains first increased and then decreased,and the grain shape changed from step-like morphology to regular polygons.
作者
安迪
罗旭东
刘鹏程
谢志鹏
李婷
AN Di;LUO Xudong;LIU Pengcheng;XIE Zhipeng;LI Ting(School of High Temperature Materia]s and Magnesium Resource Engineering, University of Science and Technology Liaoning, Anshan 114051, China;Jiangsu Zhonglei Energy-Save and Technology Development Co., Ltd., Dongtai 224213, China;State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第4期53-57,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51402143)
辽宁省自然科学基金资助项目(601009802)
