PTFE/Al/Al_2O_3反应材料的力学性能与反应特性

Mechanical Properties and Reaction Characteristics of PTFE/Al/Al_2O_3 Reactive Materials

为研究以聚四氟乙烯(PTFE)/Al为基体,Al_2O_3为添加剂的反应材料的力学性能与反应特性,利用准静态压缩实验和同步热分析实验,得到了材料的应力应变数据和热重–差示扫描量热曲线,对比研究了PTFE/Al/Al_2O_3三元反应材料的准静压力学性能与静态释能特性。结果表明,加入适量的Al_2O_3可以提高PTFE/Al材料强度,然而过量的Al_2O_3会使材料强度降低;纳米级Al颗粒和纳米级Al_2O_3均能够与PTFE发生反应,而当粒径由纳米级增大至微米级时,反应剧烈程度大幅降低;PTFE/Al (1μm)/Al_2O_3 (30nm)样品主反应放热量为7.86J/g,而PTFE/Al (1μm)样品主反应放热量仅为0.93J/g,即PTFE/Al中添加纳米级的Al_2O_3能够增加反应释放能量,使材料反应更加剧烈。

To study the mechanical properties and reaction characteristics of composites with polytetrafluoroethylene(PTFE)/Al as matrix and Al2O3 as additive,the stress-strain data and TG–DSC curves of composites were obtained by quasi-static compression test and synchronous thermal analysis test.The quasi-static compression mechanical properties and static energy release characteristics of PTFE/Al/Al2O3 ternary reactive materials were studied.Results showed that the strength of composites could be improved by adding proper amount of Al2O3,but the strength could be decreased by excessive amount of Al2O3.Both nano-Al particle and nano-Al2O3 could react with PTFE,and the reaction intensity decreased significantly as the particle size increased from nano-scale to micron-scale.The exothermic energy of the main reaction of PTFE/Al(1μm)/Al2O3(30 nm)was 7.86 J/g,and that of PTFE/Al(1μm)was only 0.93 J/g.Adding nano-Al2O3 to PTFE/Al composite could enhance the reaction released energy and make the reaction more violent.