氧化物气凝胶高温红外改性研究
Research Advances on High-Temperature Infrared Modification of Oxide Aerogels
黄睿名 1姜勇刚 1柳凤琦 1冯军宗 1李良军 1冯坚1
作者信息
- 1. 国防科技大学 空天科学学院 新型陶瓷纤维及其复合材料重点实验室 长沙 410073
- 折叠
摘要
氧化物气凝胶是一类具有超低热导率的新型纳米多孔材料,在航空航天等高温隔热领域具有广阔的应用前景.然而目前常见的氧化硅、氧化铝等氧化物气凝胶受材料/结构单元固有性质的限制,其通常具有红外透明性,而高温下辐射传热占据主导地位,大量红外辐射会透过气凝胶,热导率急剧攀升,导致其高温隔热性能较差,因此需要对其进行高温红外改性,从而满足更高的隔热性能需求.本文综述了近年来添加遮光剂、纤维及调整气凝胶的结构/形貌在提高氧化物气凝胶高温隔热性能方面的研究进展,并对未来研究方向进行展望.
Abstract
Oxide aerogel is a novel nano-porous material with ultra-low thermal conductivity.In particular,it can be used in spaceflight applications and other thermal management fields.Currently,with high infrared transmittance,most of the common pure oxide aerogels,such as silica and alumina,have no advantages in high-temperature insulation because of their intrinsic property.However,electromagnetic radiation in the near-infrared region is the main mode of heat conduction at high temperatures,accordingly,a large amount of electromagnetic radiation will pass through aerogel and lead to the rapid increase of thermal conductivity.Therefore,to meet the requirement of thermal insulation at higher temperature,it is necessary to reduce the radiative heat transfer.Based on the research status,this paper reviewed the main progress of improving high temperature insulation of oxide aerogel by adding opacifier,fiber and adjusting the structure and morphology.Moreover,the future research direction has prospected.
关键词
氧化物气凝胶/红外改性/复合材料/高温隔热/遮光剂/纤维Key words
oxide aerogel/infrared modification/composite material/high temperature insulation/opacifier/fiber引用本文复制引用
基金项目
湖南省重点研发计划(2022GK2027)
湖南省自然科学基金项目(2023JJ30632)
国家重点研发计划(2022YFC2204403)
出版年
2024
NETL
NSTL
维普
万方数据