Electrospinning preparation of microanoscale-A1/M0O_3 thermite fibers with enhanced combustion performances through incorporating nano- carbon materials

摘要

In order to enhance the combustion performance of Al/M0O_3 thermite, as well as protect the activity of aluminum, three different kinds of nano-carbon materials were incorporated into the formulations by means of electrospinning technique with nitrocellulose as the carrier. Three scale levels of aluminum particles, i.e. micro-, sub-micro- and nano-aluminum, were used in the formulations. Morphologies, elements distributions, phase structures and heat transfer coefficients of the samples were analyzed by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD) and heat flow meter, respectively. XRD and EDS measurements confirmed the existence of all ingredients. SEM results proved that electrospinning technique is an efficient mean of uniformly distributing all ingredients in general. Heat flow meter results showed that the raw thermites fiber, nano-Al/MoO_3 in particular, gained better heat transfer performances with the addition of nano-carbon materials especially reduced graphene oxide. As for combustion performance, nano-Al/MoO_3 fiber owned highest combustion rate of all, while nano-carbon materials were most helpful in elevating the combustion rate of sub-micro counterpart. Among three kinds of nano-carbon materilas, reduced graphene oxide was the most efficient one in enhancing combustion rates of samples. Overall, the addition of nano-carbon materials into thermite formulation can efficiently increase the combustion as well as heat transfer performance of microlnanoscale-Al/MoO_3 thermite fibers.