采用常温搅拌发泡、凝胶注凝成形工艺，以磷酸二氢铝作为凝胶剂、以OP－10作为发泡剂，多晶氧化铝纤维作为增强剂，制备了轻质多孔高铝耐火材料。研究结果表明，随着Al（OH）3用量的增加，坯体的抗压强度不断增大，P／A1摩尔比为3∶2．35时坯体抗压强度能达到2．76MPa。烧结后，P／A1摩尔比为3∶2．01时试样的抗压强度能达到5．21MPa，Al（OH）3用量超过15％后抗压强度减小。试样的开孔隙率为74．92～79．35％，体积密度（Db）为0．494～0．663g／cm3。试样的导热系数约为0．082～0．119W／（m·k）。%The lightweight porous alumina ceramics were prepared by gel -casting and air -foaming method ,using aluminum dihydrogen -phosphate as gelling agent , OP -10 as foam -stabilizin‐g agent and polycrystalline alumina fibers as reinforcement .The results showed that the amount of Al(OH)3 has influence on the properties of the specimens .With the amount of Al(OH)3 increased , the comprehensive strength of the specimens increased first and then decreased .The porosity of the specimens was 74 .92% ~79 .35% ,the volume density (Db ) was 0 .494~0 .663g/cm3 .The thermal conductivity of the sample was about 0 .082~0 .119W/(m k) .
展开▼
