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

Abstract:

The oxidation kinetics curves of both AlN and AlN/BN laminated composite ceramics at 1000 and 1300 ℃ were studied using a cycle-oxidation method. The result shows that the weight increase of AlN/h-BN laminated ceramic composites is lower than AlN ceramic at 1000 ℃, and the oxidation dynamics curve of AlN/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 AlN/BN laminated composite ceramics after 1300 ℃ oxidation and the micropores remain due to the vaporizing of B2O3 oxidized by BN