摘要
SiO2-Al2O3复合气凝胶(SAA)具有低密度、高比表面积、低热导率和耐高温等特点,可应用于航空航天、化工冶金、窑炉保温等领域.常压干燥具备制备成本低、可满足工业化大批量生产等优势,具有良好的实际应用前景.介绍了 SAA的制备方法,重点对常压干燥制备SAA中前驱体、表面改性剂、纤维增强的研究现状进行了综述,并展望了常压干燥方法制备SAA的发展方向.
Abstract
SiO2-Al2O3 composite aerogel(SAA)has shown a wide range of application in aerospace,chemical metallurgy,furnace insulation and other fields due to the characteristics of low bulk density,high specific surface area,low thermal conductivity and high temperature resistance.Ambient pressure drying has the advantages of low preparation cost,easy industrial mass production and so on,so it has a good practical application prospect.In this work,the preparation methods of SAA were introduced,with empha-sis on the research status of precursors,surface modifiers and fiber reinforcements in the preparation of SAA by ambient pressure drying.Finally,the development direction of SAA prepared by ambient pressure drying was prospected.
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