TFGE包覆微米铝粉的点火燃烧性能  

Ignition and Combustion Performance of Micron Aluminum Powder Coated with TFGE

作　　者：张言 仪建华[1] 谢晓 陈超[1] 李恒 金波 孙志华[1] 许毅[1] 赵凤起[1] 徐抗震[3] ZHANG Yan;YI Jian-hua;XIE Xiao;CHEN Chao;LI Heng;JIN Bo;SUN Zhi-hua;XU Yi;ZHAO Feng-qi;XU Kang-zhen(National Key Laboratory of Energetic Materials,Xi′an Modern Chemistry Research Institute,Xi′an 710065,China;State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang Sichuan 621010,China;School of Chemical Engineering&Xi′an Key Laboratory of Special Energy Materials,Northwest University,Xi′an 710069,China)

机构地区：[1]西安近代化学研究所含能材料全国重点实验室,陕西西安710065 [2]西南科技大学环境友好能源材料国家重点实验室,四川绵阳621010 [3]西北大学化工学院&西安市特种能源材料重点实验室,陕西西安710069

出　　处：《火炸药学报》2024年第5期445-452,I0005,共9页Chinese Journal of Explosives & Propellants

基　　金：国家自然科学基金(No.22075226)。

摘　　要：引入一种新型端羟基氟聚物TFGE,将不同粒径的球形微米铝粉(1、5、12μm和29μm)用TFGE包覆制备成多种Al/TFGE二元铝氟化合物;采用扫描电镜(SEM)对不同粒径微米铝粉和Al/TFGE二元铝氟化合物的微观形貌进行了表征;采用TG、DSC等分析了微米铝粉和Al/TFGE二元铝氟化合物的热分解行为,并通过激光点火对其点火燃烧过程进行了研究,获得了铝粉粒径对点火延迟时间的影响规律,对燃烧残渣进行了SEM和X射线衍射(XRD)分析。结果表明,TFGE包覆增加了微米铝粉的点火延迟时间,1μm铝粉的点火延迟时间从103.5 ms增至130.5 ms;但另一方面,TFGE包覆可以明显提升微米铝粉的反应活性,提高微米铝粉的燃烧效率,改善微米铝粉的燃烧性能;通过对燃烧残渣进行分析,发现Al/TFGE二元铝氟化合物燃烧生成Al_(4)C_(3)和AlF_(3)固相产物,主要是TFGE受热分解产生的CH_(x)和CF_(3)基团与铝粉发生化学反应生成;同时,随着铝粉粒径增大及包覆厚度增加,Al_(4)C_(3)和AlF_(3)产物生成比例降低,未反应铝粉比例增加,燃烧反应活性受到抑制。A variety of Al/TFGE binary compounds with coated spherical micron aluminum(Al)powders of different particle sizes(1,5,12,29μm)were prepared by introducing a new type of terminal hydroxyl fluoropolymer TFGE.The microscopic morphology of micron Al powders with different particle sizes and Al/TFGE binary compounds were characterized by using SEM.The thermal decomposition behaviors of micron Al powder and Al/TFGE binary compounds were analyzed by using TG and DSC.The ignition and combustion process were investigated by laser ignition technique to obtain the influence of the particle size of Al powder on the ignition delay time,and the combustion residue was analyzed by SEM and XRD.The results show that the ignition delay time of the micron Al powder after coating TFGE increases,and the ignition delay time of 1μm Al increases from 103.5 ms to 130.5 ms.However,the coating of TFGE can obviously enhance the reactivity and the combustion efficiency of micron Al powder,and promote the combustion performance of micron Al powders.Through the analysis of the combustion residue,it is found that the combustion of Al/TFGE binary compounds generates Al_(4)C_(3)and AlF_(3)solid-phase products,which are mainly generated by the chemical reactions of CHx and CF_(3)with Al powder.At the same time,with the increase of the particle size of Al powder and the increase of the coating thickness,the proportion of Al_(4)C_(3)and AlF_(3)products decreases,the proportion of unreacted aluminum powder increases,and the combustion reaction activity is inhibited.

关 键 词：物理化学 微米铝粉 Al/TFGE二元铝氟化合物 激光点火 点火延迟时间 金属燃料 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O643[理学—物理化学]