原始粉体对Mg-PSZ陶瓷电化学性能的影响  

Effect of original powders on electrochemical property of Mg-PSZ ceramics

作　　者：洪浩 刘涛 于景坤 Hong Hao;Liu Tao;Yu Jingkun(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《材料与冶金学报》2024年第6期592-597,606,共7页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(51974072);中央高校基本科研业务费项目(N2125028)。

摘　　要：分别利用固相烧结法和共沉淀法制备了摩尔分数为8%的MgO稳定ZrO_(2)粉体,并在1 600℃下烧结2 h,获得了摩尔分数为8%的MgO部分稳定氧化锆陶瓷(8Mg-PSZ),考察了原始粉体对陶瓷体相含量、致密度、微观结构和离子电导率的影响.结果表明:原始粉体形貌对Mg-PSZ陶瓷性能的影响很大,原始粉体粒径越小、团聚程度越低,所获得的Mg-PSZ陶瓷四方相和立方相氧化锆含量(体积分数)、致密度越大,离子电导率越高;以NaOH溶液为沉淀剂、以共沉淀法合成的粉体为原料烧结得到的Mg-PSZ陶瓷具有最佳性能,体积密度为5.68 g/cm^(3),在650~950℃的测试范围内激活能为1.24 eV,950℃下离子电导率可达4.79 mS/cm.ZrO_(2) powders stabilized by 8%MgO(mole fraction)were prepared by solid-state sintering method and co-precipitation method,respectively,and 8%MgO-partially stabilized ZrO_(2) ceramics(8Mg-PSZ)were obtained by sintering at 1600℃for 2 h.The effects of the original powders on the phase content,density,microstructure,and ionic conductivity of the ceramics were investigated.The results show that the original powders morphology has a great influence on the properties of Mg-PSZ ceramics.The smaller particle size of the original powders,the lower degree of agglomeration,and the higher content(volume fraction)and density of tetragonal and cubic zirconia in Mg-PSZ ceramics,the higher the ionic conductivity.Using NaOH solution as precipitant,Mg-PSZ powders obtained by coprecipitation method have the best properties,the bulk density is 5.68 g/cm^(3),the activation energy is 1.24 eV in the testing range of 650~950℃,and the ionic conductivity can reach 4.79 mS/cm at 950℃.

关 键 词：氧化锆陶瓷 致密度 离子电导率 

分 类 号：TQ174[化学工程—陶瓷工业]