Performance And Application Of Diatomaceous Earth As An Emulsion Matrix Carrier For Low-explosive Explosives

Traditional low-explosive explosives usually add an appropriate amount of inert additives such as sodium chloride,perlite or mineral powder to powdered ammonium nitrate explosives to reduce the energy density of explosives.The compatibility of additives and powdered ammonium nitrate explosives is poor after mixing,and explosives and additives are easy to separate during long-term storage and transportation,which makes the detonation performance of explosives unstable and affects the use of explosives.In this paper,the main elements and macrostructure of diatomaceous earth were analyzed by EDS energy spectrometer,scanning electron microscopy,X-ray fluorescence spectrometer,and the main elements and macrostructure of the material.Diatomite particles with a particle size of 20 mesh～80 purposes were screened,and three traditional oil-phase formulas were prepared to prepare emulsion matrices,the content of diatomaceous earth added to the emulsion matrix was controlled,and the influence of the particle size and content of diatomite on the morphology,density,particle size and explosive performance of the emulsion explosive was tested.The thermal stability analysis of the prepared emulsion explosive and emulsion matrix,XRD diffraction analysis of the emulsion explosive residue after thermal analysis,and the storage experiment of the prepared emulsion explosive were carried out to characterize the compatibility of diatomaceous earth and emulsion matrix.Two explosion welding models with different charge structures were designed,and the prepared explosives were used for explosive welding experiments,the bonding of composite interface metals was observed,and the mechanical properties of composite metals were tested.The results show that the main component of diatomaceous earth is Si O₂,which does not participate in the explosion chemical reaction.The shape of the diatomite particles is irregular,and its internal cavity is 20～50μm micron-level void structure,which makes the emulsion explosive have a certain self-sensitization effect;At the same time,the honeycomb pore structure of diatomite itself has a larger specific surface area,which has better adsorption performance.When diatomaceous earth particles with different particle sizes with the same content were added to the three emulsified matrices,the explosive detonation rate increased with the decrease of particle size.Diatomite was added to the emulsion matrix of three different oil phases,the explosive detonation rate,density and particle size decreased with the increase of diatomite content,the morphology of the explosive changed from continuous colloidal to completely powdery,and the detonation speed could be adjusted in the range of2485m·s-1～1498m·s-1;the prepared emulsion matrix and emulsion explosive had good thermal stability,the residue after heat treatment of emulsion explosive was basically the same as that of diatomaceous earth,and the performance of the explosive was stable after long-term storage;Using hollow PVC pipe charge structure 1 and water as the medium of charge structure 2,and the above-mentioned new emulsified explosive with diatomite as the carrier is applied to the explosion welding experiment of copper pipe and steel pipe,the welding surface of the composite pipe shows a regular wave-like combination,the bonding strength at the composite interface of charge structure 1 and 2 is 368MPa and 361MPa,the maximum shear force is 332MPa and 318MPa,and the difference in strength at the composite interface of the two is less than 5%.The low-explosive emulsion explosive studied in this project uses diatomaceous earth as the carrier of the emulsion matrix.Diatomaceous earth itself does not participate in the detonation reaction,which hinders the propagation speed of the detonation wave and reduces the detonation speed of the explosive;The prepared emulsion explosive has a large adjustable detonation range and is a powdery structure that is easy to step in;Diatomaceous earth has good compatibility with emulsified matrix;The prepared emulsion explosive has stable storage performance and good effect in the explosion welding of copper/steel pipes of two charge structures.Figure 41 Table 19 Parameter 78...