耐高温SiO_(2)气凝胶隔热复合材料的重复使用性能  

Reusability of high-temperature resistance SiO_(2) aerogel insulation composites

作　　者：徐凛 姜勇刚[1] 李良军 冯军宗[1] 冯坚[1] XU Lin;JIANG Yonggang;LI Liangjun;FENG Junzong;FENG Jian(Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[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,湖南长沙410073

出　　处：《南京工业大学学报（自然科学版）》2023年第4期411-418,共8页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：湖南省重点研发计划(2022GK2027)。

摘　　要：空天往返飞行器热防护系统要求隔热材料必须具有良好的可重复使用性能。以耐高温SiO_(2)气凝胶隔热复合材料(SAF)为研究对象,采用800℃/2000 s马弗炉热处理方式,研究高温重复使用次数对SAF材料热稳定性、微观结构和组成、力学和隔热性能的响应。结果表明:经800℃/2000 s马弗炉处理20次后,SAF材料800℃热导率(0.0420 W/(m·K))和隔热性能(800℃/2000 s石英灯红外辐射加热,材料背面温升147.6℃)与热处理前性能相当,压缩强度增加33%(3%应变),材料厚度、微观结构形貌和材料组成变化不大。The thermal protection system of space shuttle requires that the thermal insulation material must have reusable performance.Taking high temperature resistance SiO_(2) aerogel insulation composites(SAF)as the research object,the SAF material was heated at 800℃ for 2000 s with Muffle furnace,the influence of heat treatment times on thermal stability,microstructure and composition,mechanical and thermal insulation properties of the material was studied.Results showed that after 20 times of treatment in Muffle furnace under 800℃ for 2000 s,the thermal conductivity(0.042 W/(m·K))and thermal insulation performance(800℃/2000 s quartz lamp infrared radiation heating,the temperature rise of the back of the material was 147.6℃)of SAF material at 800℃ were similar to those before heat treatment.In addition,the compressive strength increased by 33%(3% strain),and the thickness,microstructure and composition of the material did not change much.

关 键 词：耐高温 SiO_(2)气凝胶 隔热材料 热导率 热处理 

分 类 号：TB333[一般工业技术—材料科学与工程] TQ127.2[化学工程—无机化工]