纳米碳材料对含硼铝热剂燃烧性能的影响

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/MoO₃ 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.