A kind of alternating micro-layered heat-conducting PBX mixed explosive and its preparation method

Abstract

The invention discloses an alternating micro-layered heat conduction PBX mixed explosive. The mixed explosive comprises, by weight, 90%-95% of an explosive, 4%-9.8% of a polymer binder and 0.2%-1% ofa heat conduction filler. The heat conduction filler comprises a flake-like heat conduction filler and a linear heat conduction filler. The flake-like heat conduction filler comprises any one of graphene, graphene nanosheets and boron nitride nanosheets. The linear heat conduction filler comprises any one of single-walled carbon nanotubes, multi-walled carbon nanotubes, boron nitride nanotubes andnano-carbon fibers. The invention also provides a preparation method of the alternating micro-layered heat conduction PBX mixed explosive. The preparation method fully utilizes the thermal conductivity characteristics and advantages of the two-dimensional flake-like and one-dimensional linear high thermal conductivity fillers and adopts an ingenious structure control strategy so that the fillersare respectively enriched in the partial layer space to form flake-like and linear thermal conduction layer passages and thus parallel transmission in layers is realized and heat transfer is maximized.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a high thermal conductivity alternating microlayered PBX mixed explosive and a preparation method thereof. Background technique [0002] Polymer Bonded Explosive (PBX) is a composite material composed of explosive crystals and a small amount of polymer binder. And the advantages of processing, it has been widely used in weapons. However, in the long-term storage, transportation and combat use of PBX explosives, it will face a complex thermophysical environment, experience high-low temperature alternating environments and a large temperature range, and the thermal conductivity of explosive crystals and polymer binders are both uniform. Low (less than 0.5W m -1 K -1 ), which is not conducive to the transfer of heat. It is easy to generate a temperature gradient inside the explosive component, resulting in uneven thermal expansion and thermal stress. The d...

AI Technical Summary

Problems solved by technology

At such a low dosage, it is common to add high thermal conductivity fillers, such as graphene with the theoretically highest thermal conductivity (5000W m -1 K -1 ), and the technical means of selecting high thermal conductivity fillers of different shapes for composite filling cannot form an effective continuous heat conduction network inside the PBX, which limits the further improvement of the thermal conductivity and cannot meet the heat conduction requirements of PBX mixed explosives

[0004] In view of the above problems, there is no effective solution at present, so it is particularly important and urgent to develop a new preparation method of PBX mixed explosives containing more efficient heat conduction paths.

Images