关键词: Mg-PSZ陶瓷, 微量Al₂O₃, 常温耐压强度, 离子电导率

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