纳米碳材料对含硼铝热剂燃烧性能的影响

Influences of Nano-carbon Materials on Combustion Performance of Boron-based Thermite

为改善含硼铝热剂的燃烧性能,在B/Mo O3体系中引入纳米片状石墨、碳纳米管、还原氧化石墨烯3种纳米碳材料。利用热流法测试了含硼铝热剂的导热性能;使用高速摄像机记录了含硼铝热剂的燃烧过程,并通过计算和分析得到了燃烧速率及其变化规律;采用金属桥带进行发火试验,测试铝热剂的临界发火电流。结果表明:添加3种碳材料能显著改善B/Mo O3铝热剂的导热性能,明显提高了燃烧速率,并降低了其临界发火电流;添加还原氧化石墨烯对铝热剂的影响最为明显,使得铝热剂导热系数提高258. 3%,燃烧速率提高1 756倍,临界发火电流降低27. 1%,证实还原氧化石墨烯显著改善了含硼铝热剂发火阈值高的问题。

Three kinds of nano-carbon materials,including nanographite flake,carbon nanotubes and reduced graphene oxide,are introduced into the system of boron/molybdenum trioxide in order to improve the combustion performance of boron-based thermite.The thermophysical properties of boron-based thermite sample were tested using a heat flux method,and their combustion processes were recorded using a high-speed camera,while the burning rates were calculated and analyzed.Then the firing test was conducted with a metal bridge for testing the critical firing current of thermite.The test results show that the addition of nanocarbon materials could improve the heat-conducting property of B/MoO 3 thermite,increase its burning rate,and reduce its critical firing current.In particular,the reduced graphene oxide is added to increase the thermal conductivity and burning rate of thermite by 258.3%and 1 756 times,respectively,and the critical firing current is reduced by 27.1%.The ignition test results of metal bridge show that the critical firing currents of thermite are decreased with maximum reduction of 27.1%.It is proved that the reduced graphene oxide has the ability to reduce the firing threshold of thermite significantly.