Oxidation Behavior of β-SiAlON-Al2O3 Composites Under Thermal Stress
β-SiAlON-Al2O3 composites were prepared using tabular alumina aggregates and fines,ultra fine alumina powder,Si powder and Al powder as starting materials,resin as binder,and then fired at 1450℃ for 72h in N2 flowing atmosphere.The effects of thermal stress and thermal stress cycles on oxidation behavior of β-SiAlON-Al2O3 composite at high temperature were investigated.The results show that thermal stress has great influence on oxidation resistance of β-SiAlON-Al2O3 composite.Weight gain increases of samples at different temperature(900-1300℃) under thermal stress in contrast to that without thermal stress,and weight gain increases with increase of thermal stress and thermal stress cycles.Thermal stress promoting oxidation of β-SiAlON-Al2O3 composite is attributed to protective oxidation film broken and micro-cracks generating under thermal stress,which provide passages for O2 entering into the inner of samples.Besides,the oxidizing products are changed under thermal stress,and thermal stress promotes amorphous SiO2 convert into quartz.
thermal stress β-SiAlON-Al2O3 composite oxidation behavior
LIU Xinhong WEN Yubin QIN Yanmeng ZHAO Fei GE Tiezhu XU Enxia DONG Xinmin JIA Quanli
Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou University,75 Daxue Road,Zhen School of Mechanical Engineering,Zhengzhou University,100 Kexue Road,Zhengzhou 450001,China
国际会议
Conference on Refractories International 2018, CRI2018)(2018国际耐火材料学术会议)
杭州
英文
1-7
2018-10-17（万方平台首次上网日期，不代表论文的发表时间）