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Preparation of the novel B4C–SiC composite aerogel with high compressive strength and low thermal conductivity

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Abstract

A novel B4C–SiC composite aerogel is synthesized using nano boron carbide suspension, 3-aminopropyltriethoxysilane (APTES), and resorcinol–formaldehyde (RF) as precursors through the sol–gel route and carbothermal reduction process. The effects of different B/Si molar ratios and calcination temperatures on the physical chemistry properties of B4C–SiC composite aerogels are investigated. The addition of the B4C phase is beneficial for improving the comprehensive properties of composite aerogel. The results show that the compressive strength of B4C–SiC composite aerogel is as high as 3.05 MPa. The specific surface area can reach 692.81 m2/g, which ensures that it has a thermal insulation capacity under elevated temperatures. After heat-treated at 1650 °C for 3 h, the thermal conductivity of carbon fiber mat reinforced composite aerogel is 0.058 W/m K (25 °C). This composite aerogel material has great application prospects in the field of high temperature insulation.

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Acknowledgements

This work was financially supported by the Key Research and Development Project of Jiangsu Province (BE2019734, BE2017151, BE2016171), the Major Program of Natural Science Fund in Colleges and Universities of Jiangsu Province (15KJA430005), the Program of Science and Technology of Suqian City (M201704, H201801, H201803), the National Natural Science Foundation of China (51702156, 81471183), the Program for Changjiang Scholars and Innovative Research Team in University (IRT_15R35), the Priority Academic Program Development of Jiangsu Higher Education Institutions and the Brand Major Program Development of Jiangsu Higher Education Institutions (PPZY2015B128). China Scholarship Council under Grant (No. 201908320194), the General Program of Natural Science Fund in Colleges and Universities of Jiangsu Province (19KJB430023), Science and technology innovation project for overseas of Nanjing City, Postdoctoral Science Foundation of Jiangsu Province (2019K005), the China Scholarship Council under Grant (No. 201908320194, No. 201908320195), China Postdoctoral Science Foundation (2019M661781, 2020M671457). Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of these programs.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211800, China

    Wei Wang, Yifan Zhao, Wenqian Yan, Sheng Cui, Xiaodong Wu & Hao Suo

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211800, China

    Wei Wang, Yifan Zhao, Wenqian Yan, Sheng Cui & Xiaodong Wu

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  1. Wei Wang
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  2. Yifan Zhao
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Correspondence to Sheng Cui.

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Wang, W., Zhao, Y., Yan, W. et al. Preparation of the novel B4C–SiC composite aerogel with high compressive strength and low thermal conductivity. J Porous Mater 28, 703–710 (2021). https://doi.org/10.1007/s10934-020-01024-6

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