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[1]徐凛,姜勇刚,冯军宗,等.纤维增强Al2O3-SiO2气凝胶隔热复合材料的制备和耐温隔热性能[J].南京工业大学学报(自然科学版),2020,42(04):461-466.[doi:10.3969/j.issn.1671-7627.2020.04.003]
 XU Lin,JIANG Yonggang,FENG Junzong,et al.Preparation and heat-resisting and insulating properties of fiber-reinforced Al2O3-SiO2 aerogels insulation composites[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2020,42(04):461-466.[doi:10.3969/j.issn.1671-7627.2020.04.003]
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纤维增强Al2O3-SiO2气凝胶隔热复合材料的制备和耐温隔热性能()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
42
期数:
2020年04期
页码:
461-466
栏目:
出版日期:
2020-07-17

文章信息/Info

Title:
Preparation and heat-resisting and insulating properties of fiber-reinforced Al2O3-SiO2 aerogels insulation composites
文章编号:
1671-7627(2020)04-0461-06
作者:
徐凛姜勇刚冯军宗李良军冯坚
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
Author(s):
XU Lin JIANG Yonggang FENG Junzong LI Liangjun 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
关键词:
纤维 Al2O3-SiO2气凝胶 热导率 力学性能 气凝胶复合材料 溶胶-凝胶法
Keywords:
fibers Al2O3-SiO2 aerogel thermal conductivity mechanical property aerogels composites sol-gel method
分类号:
TB332
DOI:
10.3969/j.issn.1671-7627.2020.04.003
文献标志码:
A
摘要:
以正硅酸乙酯(TEOS)、仲丁醇铝(ASB)为前驱体,采用溶胶-凝胶及超临界干燥工艺,分别制备硅酸铝纤维(ASF)、Al2O3纤维(AF)和莫来石纤维(MF)增强Al2O3-SiO2气凝胶(ASC)隔热复合材料,并对材料的微观结构、耐温性、高温热导率和力学性能进行研究。结果表明:纳米多孔Al2O3-SiO2气凝胶均匀填充到纤维间的孔隙中,并紧密包裹在纤维的表面,显著减少了纤维间的搭接,Al2O3-SiO2气凝胶隔热复合材料中的纤维增强相发挥了增强、增韧功能。纤维种类对材料耐温性、高温热导率有较大的影响,对力学性能影响较小,AF/ASC和MF/ASC复合材料耐温性能较高,经1 200 ℃、30 min热处理后,材料厚度方向平均线收缩率分别为-2.5%和2.7%; MF/ASC复合材料的热导率较低,当热面温度为1 100 ℃时热导率达到0.065 W/(m·K); 3种纤维增强Al2O3-SiO2气凝胶隔热复合材料的力学性能相当,材料3%应变的压缩应力分别为0.22、0.21和0.19 MPa。
Abstract:
Aluminium silicate fiber(ASF), alumina fiber(AF)and mullite fiber(MF)reinforced Al2O3-SiO2 aerogels insulation composites(ASC)were prepared from aluminum sect-butoxide(ASB)and tetraethoxysila(TEOS)precursor by sol-gel method and supercritical drying. Effects of microstructure, heat-resisting, high-temperature thermal conductivity and mechanical property of the composites were investigated. Results showed that Al2O3-SiO2 aerogels uniformly displayed within the pores between fibers, and were tightly wrapped on the surface of the fibers, which significantly reduced the overlap between fibers. The fiber acted as an enhanced and toughening function in Al2O3-SiO2 aerogels insulation composites. The type of fiber had influence on high temperature resistance and thermal conductivity of composites, but it had little effect on mechanical properties. AF/ASC and MF/ASC had high heat resistance, the thickness shrinkages were -2.5% and 2.7%, at 1 200 ℃ for 30 min, respectively.The lowest thermal conductivity of MF/ASC at 1 100 ℃ was 0.065 W/(m·K). The mechanical properties of ASF/ASC,AF/ASC and MF/ASC were equivalent, and the compressive stresses were 0.22,0.21 and 0.19 MPa(3% strain).

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备注/Memo

备注/Memo:
收稿日期:2019-11-04
基金项目:国家自然科学基金(51702360)
作者简介:徐凛(1986—),男,工程师,E-mail:xulin0330@126.com; 姜勇刚(联系人),副研究员,E-mail:jygemail@163.com.
引用格式:徐凛,姜勇刚,冯军宗,等.纤维增强Al2O3-SiO2气凝胶隔热复合材料的制备和耐温隔热性能[J].南京工业大学学报(自然科学版),2020,42(4):461-466.
XU Lin, JIANG Yonggang, FENG Junzong, et al. Preparation and heat-resisting and insulating properties of fiber-reinforced Al2O3-SiO2 aerogels insulation composites[J].Journal of Nanjing Tech University(Natural Science Edition),2020,42(4):461-466..
更新日期/Last Update: 2020-07-30