非压力浸渍成型技术制备夹层结构气凝胶外防热材料

材料导报

2019, Vol. 33

Issue (z1): 206-210

无机非金属及其复合材料

非压力浸渍成型技术制备夹层结构气凝胶外防热材料

苏力军, 张丽娟, 宋寒, 郭慧, 郭建业, 李文静, 杨洁颖, 裴雨辰

航天特种材料及工艺技术研究所,北京 100074

Preparation of Outside Aerogel Heat Shields with Sandwich Structure by Using Non-pressure Impregnating Process

SU Lijun, ZHANG Lijuan, SONG Han, GUO Hui, GUO Jianye, LI Wenjing, YANG Jieying, PEI Yuchen

Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074

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摘要夹层结构气凝胶外防热材料兼具中间层气凝胶材料高效隔热、陶瓷面板材料抗冲刷特点,在未来新型航天飞行器大面积外防隔热领域具有广阔的应用前景。常规的基于压力浸渍成型技术制备的夹层结构气凝胶外防热材料易于出现中间层气凝胶材料渗胶、塌陷、分层问题,从而失去了气凝胶材料高效隔热的特性。本工作提出了非压力浸渍成型技术,即将压力浸渍改为真空浸渍,解决了气凝胶易于渗胶、塌陷问题,通过调节面板陶瓷前驱体浓度、分子链团聚粒径大小、浸渍次数将面板材料力学强度稳固提高,夹层结构材料隔热性能和应变协调性能优异,中心点挠曲位移达8.89 mm,在1 200 ℃电弧风洞考核试验中,1 000 s时背面温升只有55 ℃。该技术在未来航天飞行器大面积热防护领域具有潜在的应用价值。

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	苏力军
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	郭慧
	郭建业
	李文静
	杨洁颖
	裴雨辰

关键词: 三明治夹层结构外防热材料气凝胶

Abstract: Outside aerogel heat shields with sandwich structure have the characteristics with extremely efficient insulation of aerogel, and with excellent anti-washout for severe aerodynamic thermal flow, just like ceramic plate. It will have a promising prospect in the outside heat shielding area for the future aerospace vehicles. However, something wrong occurred when it was produced by using conventional pressure impregnating process, the aerogel was soaked by the plate ceramic precursor, broken down, and collapsed. Finally, the inherent insulative feature was lost. Non-pressure impregnating process was proposed, and the pressure impregnation was changed to non-pressure impregnation. The problems of soaked by the plate ceramic precursor and broken down were solved. When the concentration of plate ceramic precursor was adjusted, agglomerated particle size of molecular chain was transformed, and number of times for impregnation was changed, the mechanical property of the plate was enhanced. It is excellent in the heat-insulating property and strain capacity, with deflection of 8.89 mm, and with back temperature of 55 ℃ when heated by 1 200 ℃ in the wind tunnel for 1 000 s. This process has the potential applied value in the outside heat shielding area for the future aerospace vehicles

Key words: sandwich structure outside heat shields aerogel

出版日期: 2019-05-25 发布日期: 2019-07-05

ZTFLH:

V45

作者简介: 苏力军,现就职于航天特种材料及工艺技术研究所,高级工程师。2010年7月毕业于上海交通大学化工学院材料学专业,获得博士学位。主要研究领域为隔热绝热材料,以第一作者在国内外学术期刊上发表论文5篇,申请国家发明专利10余项,其中已授权3项。李文静,现就职于航天特种材料及工艺技术研究所,研究员。2010年7月毕业于德国亚琛工业大学,博士后毕业。主要研究领域为隔热绝热材料,国内外学术期刊上发表论文10余篇,授权专利16项。ht3lwj@126.com

引用本文:

苏力军, 张丽娟, 宋寒, 郭慧, 郭建业, 李文静, 杨洁颖, 裴雨辰. 非压力浸渍成型技术制备夹层结构气凝胶外防热材料[J]. 材料导报, 2019, 33(z1): 206-210.
SU Lijun, ZHANG Lijuan, SONG Han, GUO Hui, GUO Jianye, LI Wenjing, YANG Jieying, PEI Yuchen. Preparation of Outside Aerogel Heat Shields with Sandwich Structure by Using Non-pressure Impregnating Process. Materials Reports, 2019, 33(z1): 206-210.

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