Oxidation Behavior of ZrB2–YAG–Al2O3 Ceramics at High Temperature

Abstract

ZrB2, YAG, and Al2O3 are widely applied because of some excellent performance qualities, but ZrB2 is easily oxidized in high-temperature air. To make the ZrB2 ceramics obtain better oxidation resistance, high-density ZrB2–YAG–Al2O3 ceramics were prepared. The oxidation behavior of ZrB2–YAG–Al2O3 ceramics was investigated. The weight gain of ceramics was increased with increasing oxidation temperature, and the weight gain of ceramics was reduced with increasing YAG–Al2O3 content and Al2O3 proportion, especially above 1500°C. The weight gain was increased with prolonged oxidation time, but the rate of weight gain was decreased gradually after 2 h, and the weight gain was reduced with increasing YAG–Al2O3 content and Al2O3 proportion. Increasing YAG–Al2O3 content and Al2O3 proportion may raise the oxidation resistance of ZrB2–YAG–Al2O3 ceramics. Through the above analysis, the oxidation resistance model of ZrB2–YAG–Al2O3 ceramics was constructed to fully comprehend the oxidation process and mechanism.