Fabrication And Performance Of Cu（N₃）₂-filled Aligned Carbon Nanotubes Composite Energetic Materials

Copper azide is a highly sensitive energetic material,because of its high electrostatic sensitivity,limiting its practical application.The carbon nanotubes have excellent electrical conductivity,which can be effectively reduced by filling copper azide into carbon nanotubes,and the output power of copper azide can be enhanced by the piping effect of carbon nanotubes.In this paper,anodic aluminum oxide(AAO)template was used to fabricate aligned carbon nanotubes,and then electrodeposition was used to grow copper in situ in carbon nanotube hollow cavities,and the copper azide filled carbon nanotubes were prepared by gas-solid azide reaction,and their properties were studied.The main contents and results are as follows:(1)The aligned carbon nanotube arrays were prepared by chemical vapor deposition(CVD)method.The results show that the carbon nanotubes prepared by chemical vapor deposition have the characteristics of both ends opening,uniform size and high orientation.The wall of carbon nanotubes is thinner than 10nm,the outer diameter of carbon nanotubes is about 250nm,The XRD and Raman spectroscopy results show that the crystallinity of carbon nanotubes prepared by self-catalysis of AAO template is poor.(2)The electrochemical deposition method was used to grow copper in situ in the hollow cavity of carbon nanotubes,and the effect of electrochemical deposition conditions(current density and deposition time)on the morphology of copper filled in carbon nanotubes was investigated.The results show that when the current density is small,the filled copper in the carbon nanotubes is acicular dendritic structure.With the increase of the current density,the packing density of the copper in the carbon nanotube increases.When the current density is 0.9mA/cm2,the filled copper in carbon nanotubes is a solid nanowire structure,with the deposition time increasing,the packing density of copper in carbon nanotubes increases.The optimal conditions for the electrochemical deposition were as follows:the current density was 0.6mA/cm2,the deposition time was 1h,and the azide reaction was carried out on the samples prepared under these conditions,and the carbon nanotubes composite materials filled with copper azide were obtained.(3)The electrostatic sensitivity of the composite materials was investigated.The results show that the 50%electrostatic ignition energy(3.25mJ)of the composite materials with copper azide filled carbon nanotubes is significantly higher than that of 50%electrostatic ignition energy(0.2 mJ)of copper azide.The copper azide filled carbon nanotubes composite materials was used as the electrophoretic solution to prepare the composite energetic bridge membranes and the thin films.The results of electro-explosion performance test show that the height of flame,the area of flame are bigger,the ignition process is more intense,and the duration of ignition is longer of carbon nanotubes composite energetic bridge membranes.Under the same electro-explosion conditions,the carbon nanotubes composite energetic bridge membranes and the Cu bridge membranes exhibit different electro-explosion characteristics.The electro-explosion delay time of carbon nanotubes composite energetic bridge membranes is shortened and the peak electro-explosion temperature is higher.The laser ignition experimental results show that the composite energetic thin films can be ignited reliably in the region of the laser beam.