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

ZrB 2 , YAG, and Al 2 O 3 are widely applied because of some excellent performance qualities, but ZrB 2 is easily oxidized in high-temperature air. To make the ZrB 2 ceramics obtain better oxidation resistance, high-density ZrB 2 -YAG-Al 2 O 3 ceramics were prepared. The oxidation behavior of ZrB 2 -YAG-Al 2 O 3 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-Al 2 O 3 content and Al 2 O 3 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-Al 2 O 3 content and Al 2 O 3 proportion. Increasing YAG-Al 2 O 3 content and Al 2 O 3 proportion may raise the oxidation resistance of ZrB 2 -YAG-Al 2 O 3 ceramics. Through the above analysis, the oxidation resistance model of ZrB 2 -YAG-Al 2 O 3 ceramics was constructed to fully comprehend the oxidation process and mechanism.