Mechanical And Thermal Conductive Properties Of Fiber-Reinforced Silica-Alumina Aerogels

Keywords

fiber-reinforcement; heat treatment; mechanical properties; silica-alumina aerogels

Abstract

We report the formation of Al2O3-SiO2 fiber-reinforced Al2O3-SiO2 aerogels with the content of fibers in the range from 40 wt% to 55 wt% by sol-gel reaction, followed by supercritical drying. The structure and physical properties of fiber-reinforced Al2O3-SiO2 aerogels are studied. We find that the fiber-reinforced Al2O3-SiO2 aerogels can be resistant to the temperature of 1200°C. The integration of fibers significantly improves the mechanical properties of Al2O3-SiO2 aerogels. We find that the bending strength of fiber-reinforced Al2O3-SiO2 aerogels increases 0.431 MPa to 0.755 MPa and the elastic modulus increases from 0.679 MPa to 1.153 MPa, when the content of fibers increases from 40 wt% to 50 wt%. The thermal conductivity of the fiber-reinforced Al2O3-SiO2 aerogels is in the range from 0.0403 W/mK to 0.0545 W/mK, depending on the content of fibers.

Publication Date

9-1-2018

Publication Title

International Journal of Applied Ceramic Technology

Volume

15

Issue

5

Number of Pages

1138-1145

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1111/ijac.12891

Socpus ID

85043689085 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85043689085

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