以碳化硅(SiC)为骨料,氧化铝(Al2O3)为烧结助剂,在空气气氛下反应烧结制备碳化硅多孔陶瓷支撑体,并配制Al2O3制膜液,采用浸浆法在支撑体表面进行涂膜.重点考察Al2O3添加量对支撑体的孔隙率、抗弯强度、微观形貌的影响与支撑体的抗热震性能;采用环境扫描电镜(SEM)观察膜层的微观形貌,并对膜层的气体渗透性能、抗热震性能等进行考察.结果表明,当烧结温度为1500℃、Al2O3添加质量数为10%时,支撑体的抗弯强度为31 MPa、孔隙率为30%,气体渗透系数为4 000 m3/(m2·h·0.1 MPa),抗热震性能良好;制备的碳化硅陶瓷复合膜,其平均孔径为4.7 μm,膜厚为110 μm,气体渗透系数为1 917 m3/(m2·h·0.1MPa),具有良好的抗热震性能.
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