The Interaction Between DNAN/DNTF Binary Eutectic Material And The Performance Of The Mixture

The melt cast explosive with TNT as liquid carrier is the most widely used military mixed explosive in weapon equipment at present.Because of the shortages of TNT,such as low energy,poor oil permeability and vulnerability,it has a strong military demand to explore a carrier explosive with excellent performance to replace TNT.Low energy content eutectic with safety and adjustable energy performance is an important research direction of TNT substitutes.In this paper,2,4-dinitrobenzene methyl ether(DNAN)with good safety and 3,4-dinitrofuranyl oxide furazan(DNTF)with high energy were used to prepare different proportions of DNAN / DNTF binary eutectic by high temperature melting method,and the phase diagram of DNAN / DNTF binary mixture was established.The crystal structure and surface morphology of the eutectic were characterized by XRD,FTIR and SEM,and the influence of the content of components in the eutectic on the structure and performance was investigated.The interaction between DNAN and DNTF components in the eutectic was studied by molecular dynamics,and the influence of the content of components in the eutectic on the explosive performance was analyzed.The thermal performance and force of DNAN / DNTF binary eutectic were studied The influence of component content on the properties of eutectic was investigated.The solidification and crystallization rate of DNAN / DNTF binary low eutectic was analyzed by hot stage polarized light microscopy.The solidification characteristics of characteristic eutectic were analyzed by step cooling curve and X-ray nondestructive testing.The main structure obtained is as follows:(1)The binary mixture of DNAN and DNTF can form low eutectic mixture.The molar composition of DNAN and DNTF is 63.3 / 36.7,and the mass composition is 52.3 / 47.7.The results of infrared spectrum and powder XRD show that there is a certain interaction between DNAN and DNTF in the eutectic.(2)There is van der Waals effect between DNAN and DNTF,the mechanical properties of DNAN / DNTF binary eutectic are better than DNAN and DNTF,the plasticity and ductility are better,and the stability of DNAN / DNTF binary hybrid system decreases with the increase content of DNTF.(3)The content of DNTF in binary eutectic system is 20% lower,and the energy performance of eutectic is equivalent to that of TNT;the impact sensitivity of dnan / DNTF hybrid system increases linearly with the increase of DNTF content,and the characteristic drop value decreases linearly with the increase of DNTF content in the low eutectic hybrid system with DNTF excess,and the friction sensitivity is affected by the excess dnan or DNTF in the system,which can be fitted by three terms The relationship between the friction sensitivity and the content is that the melting mixing and mechanical mixing have little effect on the mechanical sensitivity;the thermal stability of binary mixing system is better than that of DNTF,but lower than that of dnan;the average elastic modulus and hardness of different proportions of dnan / DNTF eutectic are higher than that of dnan and DNTF,and the resistance to deformation is stronger than that of dnan and DNTF crystals under external force.(4)Under the condition of small undercooling,the solidification and crystallization rate of DNAN / DNTF low eutectic mixture is much lower than that of DNAN and DNTF;the solidification characteristics of DNAN / DNTF(80 / 20)eutectic is similar to DNAN and DNTF,but it is significantly different from TNT.Compared with TNT,DNAN and DNTF,the mixture of DNAN / DNTF(80 / 20)takes a long time to complete solidification;The solidification mode of DNAN / DNTF(80 / 20)is is intermediate solidification,which is obviously different from that of TNT layer by layer.