PTFE含量和烧结温度对Al/PTFE复合粒子形貌与燃烧性能的影响  

Effects of PTFE Content and Sintering Temperature on the Morphology and Combustion Performances of Al/PTFE Composites

作　　者：徐闻婷 杭思羽 李亚宁 韩志伟[1] 王伯良[1] XU Wen-ting;HANG Si-yu;LI Ya-ning;HAN Zhi-wei;WANG Bo-liang(School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《含能材料》2020年第11期1061-1067,I0003,共8页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(11702142);江苏省自然科学基金资助(BK20170825)。

摘　　要：为了探索聚四氟乙烯(PTFE)含量和烧结温度对铝粉(Al)/PTFE复合粒子形貌和燃烧性能的影响规律,采用球磨-烧结工艺,制备了不同配比、不同烧结温度的Al/PTFE复合粒子。用扫描电子显微镜(SEM)、X射线衍射仪(XRD)对样品进行表征,研究了PTFE含量和烧结温度对复合粒子微观形貌的影响;利用密闭燃烧罐、高速摄像仪及红外热成像仪,对样品的燃烧过程进行分析,探究了PTFE含量和烧结温度对复合粒子燃烧性能的影响。结果表明,340℃烧结能使复合粒子形成规整的核壳结构,PTFE含量小于35%时,粒子包覆完整度随PTFE含量的增大而增大;当PTFE含量继续增加时,复合粒子形状变得不规则,出现颗粒凝聚。随着PTFE含量以及烧结温度的提高,样品的燃速、燃烧剧烈程度、火焰温度等均呈现出先提升再降低的趋势。最优条件(PTFE含量35%,烧结温度340℃)制备的样品较其它条件制备的样品,燃烧压力最高增大16%,燃烧时间最长缩短37%,中心火焰温度提高317.1℃,这表明,适量的(35%最佳)的PTFE含量和合适的烧结温度(340℃最佳)会显著改善复合粒子的燃烧性能。To explore the effect of polytetrafluoroethylene(PTFE)content and sintering temperature on the morphology and combustion performances of aluminum powder(Al)/PTFE composites,the ball mill-sintering process was used to prepare Al/PTFE samples.These samples have been characterized by scanning electron microscopy(SEM)and X-ray diffractometer(XRD),and the effect of PTFE content and sintering temperature on the microscopic morphology of the composites has been studied.The combustion processes have been analyzed using a confined combustion chamber,coupled with a high-speed camera and infrared thermal imager.The effects of PTFE content and sintering temperature on the combustion performances of the composites have been explored.The results show that sintering at 340℃can make the composites form a regular core-shell structure.When the PTFE content is less than 35%,the integrity of the particle coating optimizes with the increasing of the PTFE content.However,when the PTFE content continues to increase,the shape of the composite particles becomes irregular,and the condensed products begin to agglomerate.With the increase of PTFE content and sintering temperature,the burning rate,radiation intensity,and the flame temperature of the samples all show a trend of first increase and then decrease.Compare the samples prepared under the optimal conditions(35%PTFE content,sintering temperature 340℃)with the ones prepared under other conditions,the combustion pressure can be increased by 16%,whereas the combustion time is shortened by up to 37%,so that the central flame temperature increases by 317.1℃.This indicates that the appropriate amount(35%optimal)of PTFE content and proper sintering temperature(340℃optimal)will significantly improve the combustion performances of the composite particles.

关 键 词：微米铝粉 聚四氟乙烯(PTFE) 烧结 核壳结构 燃烧性能 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O64[理学—物理化学]