Study on combustion characteristics and pyrolysis kinetics of flameproof sealing silica for aircraft designated fire zones

被引：0
|
作者：
Zhang X. [1 ]
Bu Q.-W. [2 ]
Wang Z. [1 ]
机构：
[1] Liaoning Key Laboratory of Aircraft Fire Explosion Control and Reliability Airworthiness Technology, Shenyang Aerospace University, Shenyang
[2] Shenyang Rubber Research and Design Institute Co. Ltd., Shenyang
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2020年 / 34卷 / 01期
关键词：
Cone calorimeter test; Fire zone sealant; Polymer; Smoke density; Thermogravimetric analysis;
D O I：
10.3969/j.issn.1003-9015.2020.01.017
中图分类号：
学科分类号：
摘要：
A and B parts of the fire zone sealant of DAPCO 2200 aircraft were blended, condensed at temperature 13 ℃ higher than ambient temperature, and crosslinked curing to form a high temperature primerless silicone elastomer. Its combustion characteristics under different fire conditions were studied by cone calorimeter, smoke density box and TG-DTA. The cone calorimetry results show that the heat radiation intensity has a great influence on the sealant performance. Higher heat radiation intensity resulted in shorter ignition time and higher mass loss after combustion. The maximum peak of heat release was 160.4 kW∙m-2 and the total amount for smoke was 38.1 MJ∙m-2. The smoke density results show that flameless combustion has more flue gas (443.5) than flame combustion under same radiation intensity, while the mass loss is not the case with total mass lose of 12.1% for flameless combustion. The TG-DTA shows that the heating rate has a significant effect on the pyrolysis of the sealant. There are two distinct phases in the pyrolysis zone. With the increase of the heating rate, the maximum decomposition temperature increased. Pyrolysis analysis by the Coats-Redfern method shows that the minimum activation energy is 78.9 kJ∙mol-1 at 20% conversion and 164.6 kJ∙mol-1 at 50% conversion. © 2020, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.
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页码：136 / 142
页数：6
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