Abstract: In order to study the effect of a trace Al₂O₃ addition on the properties of Mg-PSZ ceramics,MgO partially stabilized zirconia (Mg-PSZ) ceramic samples with trace Al₂O₃ were synthesized by solid-state sintering using ZrO₂,MgO,and Al₂O₃ as raw materials,and compared with Mg-PSZ samples without Al₂O₃.The effects of sintering temperatures (1 000-1 700 ℃ for 2 h with an interval of 100 ℃) on the phase composition,microstructure,properties of the samples were studied.The results show that:(1)with the sintering temperature rising,the total contents of c-ZrO₂ and t-ZrO₂ phases in the two samples both increase,the ionic conductivity increases;however,the bulk density of the sample without Al₂O₃ increases,while that of the samples with Al₂O₃ increases first and then decreases;(2)the comprehensive performance of the sample with Al₂O₃ is better than that without Al₂O₃;(3)the sample with Al₂O₃ has the best comprehensive performance after firing at 1 600 ℃.

Key words: Mg-PSZ ceramics, trace Al₂O₃, cold compressive strength, ionic conductivity

摘要： 为了研究微量Al₂O₃添加对Mg-PSZ粉体烧结活性和陶瓷性能的影响,以ZrO₂、MgO和Al₂O₃为原料,固相烧结合成微量Al₂O₃添加的氧化镁部分稳定氧化锆(Mg-PSZ)陶瓷试样,与未添加Al₂O₃的Mg-PSZ试样进行比较分析。研究烧结温度(1 000~1 700 ℃保温2 h,间隔100 ℃)对试样物相组成、显微结构、性能的影响。结果表明:1)随烧结温度的升高,2种试样中c-ZrO₂和t-ZrO₂相的含量均增加,离子电导率均增加,但未添加Al₂O₃的试样的体积密度增加,而添加Al₂O₃的试样的体积密度先增加后减小;2)添加Al₂O₃的试样的综合性能比未添加Al₂O₃的试样的好;3)添加Al₂O₃的试样经1 600 ℃烧后的综合性能最好。

关键词: Mg-PSZ陶瓷, 微量Al₂O₃, 常温耐压强度, 离子电导率