Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (9): 969-975.doi: 10.15541/jim20170570

• Orginal Article • Previous Articles     Next Articles

High-temperature Insulation Property of Opacifier-doped Al2O3-SiO2 Aerogel/Mullite Fiber Composites

Zhao-Xian ZHU1(), Fei WANG2, Hong-Jun YAO1, Jin-Xin DONG1, Dong-Hui LONG1()   

  1. 1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
    2. China Academy of Space Technology, Beijing 100074, China
  • Received:2017-11-27 Revised:2018-02-07 Online:2018-09-20 Published:2018-08-14
  • About author:ZHU Zhao-Xian. E-mail: zxzhu1991@163.com

Abstract:

Infrared opacifier-doped Al2O3-SiO2 aerogel/mullite fiber composites were successfully prepared through a mixed Sol-Gel and supercritical drying process by using TiCl4 and ZrOCl2·8H2O as the source of TiO2 and ZrO2, respectively. Effects of two kinds of infrared opacifier on microstructure, mechanical property and thermal conductivity of composites were studied. The results show that introduction of infrared opacifier effectively prevent the aerogels from collapse and agglomeration when exposed to high temperature, leading to high-level retention of porosity. The aerogel/mullite fiber composites demonstrate a typical structure of aerogel filled fibrous fiber with marvelous properties—low density (0.21-0.24 g·cm-1) and high bending strength performance (0.98-1.26 MPa), which expands brilliant potential in many areas of application. When exposed to high temperature of 1050℃, the thermal conductivity of TiO2 and ZrO2 doped composites can be significantly reduced from 0.098 W·m-1·K-1 to 0.085 W·m-1·K-1 and 0.076 W·m-1·K-1, respectively, which could be attributed to outstanding scattering and absorbing ability of the infrared opacifiers to the infrared electromagnetic wave. All results indicate that the addition of infrared opacifiers is a promicsing approach to enhance high-temperature properties of aerogel materials.

Key words: Al2O3-SiO2 aerogels, infrared opacifier, thermal conductivity, high temperature insulation properties

CLC Number: 

  • TB35