MgAl_2O_4对MgO-PSZ陶瓷的烧结与热学性能的影响  

Influence of MgAl_2O_4 on the Sintering and Thermal Properties of MgO-PSZ Ceramics

作　　者：樊传刚[1] 严解荣[2] 徐兰[1] 朱义文[2] 于洋[2] 林娜[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]马钢股份有限公司技术中心,安徽马鞍山243000

出　　处：《安徽工业大学学报（自然科学版）》2006年第4期387-389,393,共4页Journal of Anhui University of Technology（Natural Science）

摘　　要：研究了MgO-PSZ和MgAl2O4改进的MgO-PSZ陶瓷制备与性能表征。发现MgO摩尔分数为10%稳定的氧化锆陶瓷样品,在室温下主晶相为单斜相,它是由四方相转变而成。样品中加入适量的MgAl2O4后,相组成中立方相含量增加,可以改变样品的抗循环热震性能,这和MgAl2O4加入后引起的晶粒细化以及致密度适度降低有关;其中在急冷温差tΔ为1075(℃即急冷最高温度为1100℃)时,在1 mol MgO-PSZ样品配料的基础上再加入0.04 mol MgAl2O4,所获得样品的残余强度率为81%,且在此温度下热震5次后出现裂纹;另外加入MgAl2O4后,样品在热处理过程中的相组成稳定性得到提高。The preparation and characterization of MgAl2O4 （MA） promoted MgO-PSZ （MA-M-PSZ） ceramics were studied. It was found that the phase composition of 10mol% MgO-PSZ was dominated by monoclinic phase of ZrO2, which was transformed from the tetragonal one. When the suitable amounts of MA （extra 4 mol %） was added into MgO-PSZ ceramics, the amounts of cubic-ZrO2 increased, corresponding to the enhancement of resistance against the thermal shocking in cycle. It was believed that the enhancement was the contribution of the decreasing of grain size and density in this sample. After a thermal-shocking with critical temperature of 1075℃, the ratio of residual-bending strength for MA-M-PSZ sample was 81%. While after 5 times thermal shocking under same condition, the destructive crack appeared on the surface of this sample, however for 10 mol%MgO- PSZ sample, it was only twice. On the other hand, after various thermal-treatment, the phase composition kept unchanged for MA-M-PSZ one.

关 键 词：PSZ 相组成 MGAL2O4 抗热震 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]