摘要
为获得聚四氟乙烯(PTFE)基铝(Al)活性材料的热化学反应性能,开展包含不同Al粒径的PTFE基Al活性材料在不同升温速率下的热化学反应实验。采用湿混工艺制备包含50 nm和10μm两种Al粒径的PTFE基Al活性材料,并利用差示扫描量热法与热重分析法分析它们在10℃/min、15℃/min、20℃/min、30℃/min升温速率下的热化学反应行为。结果表明:在10~30℃/min升温速率中,包含纳米Al颗粒的PTFE基Al试样都发生了反应放热,而包含微米Al颗粒的PTFE基Al试样在小于900℃时并未与PTFE分解产物发生反应;Al颗粒的加入会对PTFE的热分解起到一定催化作用;对于Al粒径为50 nm的PTFE基Al活性材料,随着升温速率的增大,反应放热峰的峰值温度不断向高温区移动(由10℃/min的578.9℃移动到30℃/min时的608.5℃),单位放热量逐渐增多(由10℃/min升温速率下的331.6 J/g升高到30℃/min升温速率下的641.3 J/g);研究结果对PTFE基Al活性材料的工程化应用具有参考意义。
In order to obtain the thermochemical reaction properties of PTFE/Al reactive materials,the thermochemical reaction experiments of PTFE/Al reactive materials with different aluminum particle sizes were carried out at different heating rates.The PTFE/Al active materials with 50 nm and 10μm aluminum particle sizes were prepared by wet mixing process,and their thermochemical reaction behaviors at heating rates of 10℃/min,15℃/min,20℃/min and 30℃/min were analyzed by differential scanning calorimetry(DSC)and thermogravimetry(TG).The results show that,at the heating rate from 10℃/min to 30℃/min,all the PTFE/Al samples containing nano Al particles are exothermic,while the PTFE/Al samples containing micro Al particles do not react with the decomposition products of PTFE at a temperature lower than 900℃;in addition,the addition of Al particles plays a catalytic role in the thermal decomposition of PTFE.For PTFE/Al active materials with aluminum particle size of 50 nm,the peak temperature of reaction exothermic peak moves to high temperature zone with the increase in heating rate,from 578.2℃to 608.5℃.The unit heat release increases from 331.6 J/g to 641.3 J/g.The research results have important reference value for the engineering application of PTFE/Al reactive materials.
作者
毛亮
叶胜
胡万翔
姜春兰
王在成
MAO Liang;YE Sheng;HU Wanxiang;JIANG Chunlan;WANG Zaicheng(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2020年第10期1962-1969,共8页
Acta Armamentarii
基金
国家自然科学基金项目(11672042)。
关键词
活性材料
热化学反应特性
聚四氟乙烯
铝粒径
reactive material
thermochemical characteristic
polytetrafluoroethylene
Al particle size
