AlN和AlN/BN层状复合陶瓷的高温氧化行为

Oxidation Behavior of AlN and AlN/BN Laminated Composites Ceramics at High Temperatures

采用循环氧化法对单相AlN和层状AlN/h-BN复合陶瓷在1000及1300℃空气中的氧化动力学曲线进行研究。结果指出,在1000℃时,层状AlN/h-BN复合陶瓷的氧化增量低于单相AlN陶瓷;在1300℃时,其氧化动力学曲线分为缓慢增重、快速氧化增重和抛物线增重3个阶段,由XRD分析及扫描电镜观察发现,在1300℃氧化30h后,试样已不存在BN相,并且由于界面层BN的氧化挥发而残留有微孔。

The oxidation kinetics curves of both AIN and AIN/BN laminated composite ceramics at 1000 and 1300℃ were studied using a cycle-oxidation method. The result shows that the weight increase of AIN/h-BN laminated ceramic composites is lower than AIN ceramic at 1000℃, and the oxidation dynamics curve of AIN/BN laminated composite ceramics could be divided into three courses at 1300℃： a slowly weight increase, a rapid weight increase and a parabola shape weight increase. The XRD analysis and SEM observations show that there was no BN inside the AIN/BN laminated composite ceramics after 1300℃ oxidation and the micropores remain due to the vaporizing of B2O3 oxidized by BN.