SiO2气凝胶复合材料的隔热和力学性能优化

SiO2气凝胶是一种新型多功能固体材料,因具有极低热导率在热学、光学及电学等领域具有广泛的发展和应用前景.但是SiO2气凝胶的高温隔热和力学性能较差,通常通过加入遮光剂和增强纤维制备三组分气凝胶复合材料,可有效改善其隔热和力学性能.在改善的过程中,组分质量分数对三组分气凝胶复合材料的隔热和力学性能影响很大.本文通过建立热导率理论模型,结合三元正交设计法研究了组分质量分数对热导率的影响规律.采用三元正交法优化了三组分气凝胶复合材料的组分质量分数,并优化获得了同时满足给定隔热和力学性能的组分区域,提供了满足工程需求的组分区域.

Optimizations of Thermal and Mechanical Properties of Silica Aerogel Composite

As a novel type of nano porous materials,silica aerogel has exhibited extensive application prospects in thermal,optical and electrical and other industrial fields owing to its super-low thermal conductivity.However,its thermal insulation performance in high temperature and mechanical behavior are poor.Commonly they could be improved by adding additives of opacifiers and fibers into aerogel matrix to form three-component aerogel composite.In the progress of improving,component contents significantly influences the thermal and mechanical properties.Therefore this study is aiming to investigate the effect of the component contents on thermal conductivities and mechanical properties based on theoretical models.The ternary orthogonal design method was used to optimize component contents,and thereby to provide guidance engineering area of component contents for satisfying the engineering requirements of thermal and mechanical properties simultaneously.