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Effects of thermal ageing on the performance of ordinary and novel superhydrophobic and oleophobic ultra-fine dry powder extinguishing agent
Authors
Yurong Liu (1993453)
Publication date
30 April 2024
Publisher
Doi
Cite
Abstract
粉末灭火剂已成为民用飞机上哈龙灭火剂的一种有前途的替代品。然而,它们的储存寿命受到热老化的显着影响,成为航空使用中一个关键但被忽视的方面。本研究研究了热老化循环对普通干粉灭火剂(ODPEA)和新型超疏水疏油超细干粉灭火剂(SHOU DPEA)各参数的影响,包括表面微观形貌、D90(90%的颗粒累积体积等于或小于该值的直径)、化学结构、 疏水和疏油角度、流动性、灭火时间和有效性。结果表明,与ODPEA相比,SHOU DPEA具有更小的粒径、更规则的颗粒形状、显著优于热稳定性和流动性的特点。此外,ODPEA的D90值随老化时间的演变呈现出两个阶段:(a)缓慢的线性生长阶段(0-160天)和(b)快速而实质性的生长阶段(160-200天)。然而,在整个加速老化过程中,SHOU DPEA的D90值逐渐增加。经过160天或更长时间的老化后,ODPEA的性能明显恶化,而SHOU DPEA的降解程度较小。特别是,160天陈酿的ODPEA的灭火浓度比未陈酿的ODPEA高10%,而200天陈酿的ODPEA的灭火浓度低于非陈酿ODPEA的10%。此外,ODPEA 和 SHOU DPEA 在室温 (25 °C) 下的预测寿命分别为 2715 天和 4525 天以上。这些发现可为航空灭火剂的评估和选择提供有价值的指导。</p
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The Francis Crick Institute
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oai:figshare.com:article/25719...
Last time updated on 23/08/2024