Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 320, Issue -, Pages 350-358Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.07.054
Keywords
Hydrophobic silica aerogel; Flammability; Oxidation kinetics; Fire hazard; Thermal decomposition
Categories
Funding
- Anhui Programs for Science and Technology Development [1604a0902175]
- Fundamental Research Funds for the Central Universities [WK2320000032]
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Silica aerogels (SAs) present great application prospects especially on thermal insulation, but their flammability is usually ignored. A combined study on the combustion behaviors and oxidation kinetics of hydrophobic silica aerogels prepared by ambient pressure drying (SA-apd) and supercritical drying (SA-sd) was performed by employing cone calorimeter and thermal analysis. The whole combustion process for SAs could be divided into three stages in which a fire propagation phenomenon was observed with the radial propagation velocity of 6.6-8.3 cm s(-1). Current investigations forcefully demonstrated that hydrophobic SAs were combustible and easy to flashover when exposed to a heat flux higher than 25 kW m(-2). Compared between the two SAs, the SA-sd owned a less fire risk with presenting a less fire hazard and a lower smoke toxicity than those of SA-apd. The oxidation kinetics by Ozawa-Flynn-Wall method revealed that SA-sd had larger apparent activation energies than those of SA-apd which conformed to the thermal stability analysis by TG-DSC. Furthermore, a two-step combustion mechanism was proposed to explain the combustion behaviors of SAs. (C) 2016 Elsevier B.V. All rights reserved.
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