Thermochemical Reaction Characteristics of PTFE/Al Reactive Material

doi:10.3969/j.issn.1000-1093.2020.10.005

Abstract

Abstract: 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.

Key words: reactivematerial, thermochemicalcharacteristic, polytetrafluoroethylene, Alparticlesize

CLC Number:

TJ410.4

MAO Liang， YE Sheng， HU Wanxiang， JIANG Chunlan， WANG Zaicheng. Thermochemical Reaction Characteristics of PTFE/Al Reactive Material[J]. Acta Armamentarii, 2020, 41(10): 1962-1969.

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