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《Materials Review》 2015-09
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Advance in Research of High Temperature Resistant Aerogel Used as Insulation Material

WU Xiaodong;CUI Sheng;WANG Ling;SHAO Gaofeng;JIAO Jian;SHEN Xiaodong;State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University;Advanced Materials Institute of Nanjing Tech University in Suqian;Avic Composite Corporation Ltd.,National Key Laboratory of Advanced Composite;  
Heat transfer via the solid backbone is low for aerogel due to its ultrahigh porosity,and heat transfer via gaseous phase is inhibited due to its network structure consisting of mesopores(2-50nm)and nanoparticles.The incorporation of so-called infrared opacifiers decreases the radiative heat transfer through reflecting,absorption and scattering processes.Thus,aerogel possesses a quite low thermal conductivity,thus can be used as efficient thermal insulation.Aerogels can be classified into three different categories,i.e.oxide aerogels,carbon aerogels and carbide aerogels,according to their constituents.Oxide aerogels possess relatively low thermal resistance due to their phase changes and particles sintering,but they obtain rather low thermal conductivity.Carbon aerogels have controllable densities and rather high thermal resistance(3000℃)under vacuum or inert atmosphere.The thermal conductivity at2000 ℃ under argon atmosphere is only 0.601W·m-1·K-1,however carbon combustion easily happens in oxidizing atmosphere.This can be solved by coating with some oxidation resistance coatings on the surface of carbon aerogels.There are insufficient studies for carbide aerogels,which mainly concern over SiC aerogel and concentrate on their preparation methods and characterizations,while little attention is paid to their thermal properties of carbide aerogels.Herein,the advances in research of the three different kinds of aerogels are presented,followed by outlook of these high temperature resistant aerogel insulations.
【Fund】: 长江学者和创新团队发展计划(IRT1146);; 江苏高校优势学科建设工程;; 江苏先进无机功能复合材料协同创新中心;; 江苏省科技支撑计划(工业)项目(BE2014128);; 江苏省“333工程”培养资金资助项目(BRA2012138);; 材料化学工程国家重点实验室开放课题基金(KL11-09);; 宿迁市科技基础设施项目(2013-39)
【CateGory Index】: TB34
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