| SiO_2气凝胶/短切石英纤维多孔骨架复合材料的制备与性能 |
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| 引用本文： | 王衍飞,张长瑞,冯坚,姜勇刚.SiO_2气凝胶/短切石英纤维多孔骨架复合材料的制备与性能[J].硅酸盐学报,2009,37(2). |
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| 作者姓名： | 王衍飞 张长瑞 冯坚 姜勇刚 |
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| 作者单位： | 国防科技大学航天与材料工程学院,新型陶瓷纤维及其复合材料国防科技重点实验室,长沙,410073 |
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| 摘 要： | 以短切石英纤维、硅溶胶、B4C粉烧结制备多孔刚性骨架,以正硅酸乙酯、去离子水和乙醇配制SiO2溶胶,多孔骨架浸渍SiO2溶胶后经超临界干燥制备了SiO2气凝胶/多孔骨架复合材料.对隔热瓦的高温热导率、比表面积和孔径分布进行了测试并且观察了微观形貌.结果表明:SiO2气凝胶复合的石英纤维刚性隔热瓦具有纳米孔结构,平均孔径为39.5nm,在600℃和800℃,其热导率分别仅为0.033 5 W/(m·K)和0.0404W/(m·K),与未复合气凝胶的刚性骨架相比,高温热导率下降了40%～50%.此外,SiO2气凝胶填充了隔热瓦骨架中的大部分的宏孔,抗弯强度提高了30%,并且使刚性隔热瓦的脆性有一定改善.
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| 关 键 词： | 短切石英纤维 氧化硅气凝胶 纳米多孔 热导率 抗弯强度 |
FABRICATION AND PROPERTIES OF SiO_2-AEROGEL /SHORT SILICA FIBER POROUS SKELETON COMPOSITE |
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| WANG Yanfei,ZHANG Changrui,FENG Jian,JIANG Yonggang.FABRICATION AND PROPERTIES OF SiO_2-AEROGEL /SHORT SILICA FIBER POROUS SKELETON COMPOSITE[J].Journal of The Chinese Ceramic Society,2009,37(2). |
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| Authors: | WANG Yanfei ZHANG Changrui FENG Jian JIANG Yonggang |
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| Affiliation: | State Key Laboratory of Advanced Ceramic Fibers & Composite Material;College of Aerospace and Material Engineering;National University of Defense Technology;Changsha 410073;China |
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| Abstract: | A short silica fiber porous skeleton consisting of colloidal silica and B4C powder was sintered.The porous skeleton was dipped into SiO2-sols prepared using tetraethyloxysilane(TEOS),deionized water and ethanol.The skeleton was supercritical dried to obtain SiO2-aerogels/short silica fiber porous skeleton composite.The high-temperature thermal conductivity,specific area and pore diameter distribution of the composite were determined,and its microstructure was observed.The results reveal that the composite h... |
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| Keywords: | short silica fiber silica-aerogel nanoporous thermal conductivity flexural strength |
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