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.

Keywords:

• High temperature
• Oxidation
• Weight gain
• ZrB₂ ceramics

ACKNOWLEDGMENTS

The authors are thankful for the financial support provided by the Science Fund for Young Scholars of the Educational Department of Jiangxi Province, China (Grant No. GJJ09595) and for the apparatus provided by the Center for Materials Testing and the Functionally Gradient Material (FGM) Research Laboratory of Wuhan University of Technology, China.