Ignition and combustion characteristics of aluminum-based fluorine-containing composite powder

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Peini Xie, Xueqin Liao, Jianzhong Liu
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引用次数: 0

Abstract

To improve the combustion characteristics of micron-sized aluminum (Al) powder, a composite powder was prepared by doping a small amount (15 wt%) of magnesium fluoride (MgF2), polytetrafluoroethylene (PTFE), and fluorinated graphite (FG) into the aluminum powder through solution dispersion method. The physical phase composition, micro morphology, thermal reactivity, and combustion performance of the composite powders were also characterized. The findings suggest that the promoting effect of the three fluorides on aluminum combustion can be ranked in the following descending order: FG > PTFE > MgF2. The fluorides can to erode the Al2O3 shell layer directly, thus creating cracks and reaction pathways for the Al core enclosed within the shell. Moreover, the gasification of AlF3 within the combustion products can escape from the surface of Al particles and promote the oxidation combustion of the exposed aluminum, which enhances the diffusion reaction on the active aluminum surface.

Abstract Image

铝基含氟复合粉末的点火和燃烧特性
为改善微米级铝粉的燃烧特性,通过溶液分散法在铝粉中掺入少量(15 wt%)氟化镁(MgF2)、聚四氟乙烯(PTFE)和氟化石墨(FG)制备了一种复合粉末。研究还对复合粉末的物相组成、微观形貌、热反应活性和燃烧性能进行了表征。研究结果表明,三种氟化物对铝燃烧的促进作用可按以下降序排列:FG;PTFE;MgF2。氟化物可以直接侵蚀 Al2O3 外壳层,从而产生裂缝,为外壳中的铝芯提供反应通道。此外,燃烧产物中气化的 AlF3 可以从铝颗粒表面逸出,促进暴露铝的氧化燃烧,从而增强活性铝表面的扩散反应。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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