聚四氟乙烯基铝活性材料的热化学反应特性

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 10 μm 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.