Study On Cyrstal Shape And Granulation Controlling Of LLM-105 And TKX-50

LLM-105 and TKX-50 are new high-energy insensitivity elementary explosives,which have good application prospects due to their excellent performance.The morphology and particle size of elemental explosives have an important influence on their application performance.Explosive crystals with different morphologies obtained through crystal shape control research can meet different sensitivity,process and mechanical properties requirements of explosives.The preparation of explosive crystals of different particle size ranges can not only meet the particle size gradation of the explosive formula to increase the charge density of the mixed explosive,but also increase the solid content of the mixed explosive to increase its energy and power.The scope of application is of great significance to improving the safety and power of weapons and ammunition in China.In this paper,Materials Studio 8.0 molecular simulation software is used to predict the crystal habit of LLM-105 under vacuum conditions,find out the important morphological crystal planes,and use the modified adhesion energy model to calculate the adhesion energy of the solvent to the important morphological crystal planes.The crystal habit of LLM-105 under the action of different solvents is compared with the crystal morphology obtained by the experiment to verify the rationality of the prediction results.The solvent-nonsolvent recrystallization method was used to study the factors and influencing laws affecting the crystal morphology and particle size of LLM-105.Needle and rod shapes were prepared from DMSO-H2 O,H2SO4-H2 O and DMSO-ethyl acetate solvent systems.,Multi-faceted cubes,and spherical LLM-105 crystals of four different crystal forms,and by controlling the main factors affecting the size of the crystal,LLM-105 multi-facetedcubic crystals with a particle size range of 0~10μm,18~25μm and 45~61μm were obtained,To achieve precise control of the crystal size of LLM-105.The impact sensitivity and thermal stability of LLM-105 crystals with different crystal shapes and different particle sizes were tested,and the influence of the crystal shape and particle size of explosive crystals on impact sensitivity and thermal stability was analyzed.The main factors influencing the morphology and particle size of TKX-50 crystal and the influence law were studied by the method of cooling recrystallization and solvent-nonsolvent recrystallization.The results show that when deionized water is used as the solvent by temperature recrystallization,the temperature is 80°C,and when Span 80 is the crystal form control agent,most of the crystals obtained by natural temperature crystallization are short rods with an aspect ratio of about 2.Regular,the crystal has no sharp edges and corners,the surface is smooth,and the particle size is uniform,the particle size is about 200 um.