摘要
为同时提高纳米Al粉的抗氧化性能及反应活性,采用静电喷雾法成功制备了不同聚偏氟乙烯(PVDF)含量的Al/PVDF复合含能微球;通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪及全自动物理吸附分析仪对所得含能微球的形貌、组分及结构进行表征,利用同步热分析仪、高速摄影仪及光电信号探测器对所得微球的热性能和燃烧性能进行研究。结果表明,所得Al/PVDF含能微球的形貌规整,粒径分布在2.5~4.5μm之间,且随着PVDF质量分数从1%增至15%,微球的两个氧化过程的放热峰峰温分别从625.3℃增至639.5℃、从823.5℃增至861.3℃,放热量从6.9kJ/g提高至11.3kJ/g,点火延迟时间从724ms降至374ms,燃烧更剧烈。说明PVDF的引入,不仅可以提高纳米Al粉的抗氧化性能,而且可激活纳米Al粉的反应活性,使其反应性能大大提升。
In order to synchronously improve the oxidation resistance and reactivity of nano-aluminum powders,Al/polyvinylidene fluoride(PVDF)composite energetic microspheres containing different mass fractions of the PVDF were successfully obtained by using an electrostatic spray method.The morphological,compositional and structural features of as-prepared Al/PVDF energetic microspheres were characterized by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy and automatic physical adsorption analyzer.The simultaneous thermal analyzer,high speed camera and photoelectric signal detector were used to investigate the thermal and combustion performances of the Al/PVDF microspheres.The results showed that the Al/PVDF energetic microspheres had good sphericity and regular morphology,and the particle size was located in the range of 2.5-4.5μm.In addition,with increasing mass percent of PVDF from 1%to 15%,the exothermic peak temperatures of the two oxidation processes were increased from 625.3℃to 639.5℃and from 823.5℃to 861.3℃,respectively,as well as accompanied by heat release increase from 6.9kJ/g to 11.3kJ/g and the ignition delay time reduce from 724ms to 374ms and the burning became more intense.Therefore,the results illustrate that the introduction of PVDF could not only improve the oxidation resistance of nano-aluminum powders but also activate the reaction capacity,so that the reactivity of the Al nanopowders was greatly improved.
作者
柯香
张伟强
张大鹏
肖磊
郝嘎子
姜炜
陈君华
KE Xiang;ZHANG Wei-qiang;ZHANG Da-peng;XIAO Lei;HAO Ga-zi;JIANG Wei;CHEN Jun-hua(School of Chemistry and Material Engineering,Anhui Science and Technology University,Bengbu Anhui 233000,China;Anhui Xinmin Glass Co.Ltd.,Chuzhou Anhui 233100,China;National Special Superfine)
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2021年第6期865-872,共8页
Chinese Journal of Explosives & Propellants
基金
安徽省自然科学基金(No.2108085QE199)
安徽省大学生创新创业训练计划项目(No.S202110879094)。
关键词
应用化学
静电喷雾
含能微球
反应活性
纳米Al粉
聚偏氟乙烯(PVDF)
applied chemistry
electrostatic spray
energetic microspheres
reactivity
nano-aluminum powders
polyvinglidene fluoride(PVDF)
