Research On The Influence Law Of Ignition Threshold Of Active Composite Materials Used In Warhea

Reactive metal powder and metal polymer composite reactive materials are widely used in ammunition warhead technology as high-energy fuel and reactive fragments.In recent years,scholars have focused on the impact reaction damage experiments of metal polymer composite reactive materials.It is found that the chemical reaction is mainly caused by the impact temperature rise when the reactive materials reach the initial reaction temperature.In order to improve the theoretical model of metal fluoropolymer composite reactive materials under high-speed impact,this subject takes typical zirconium,titanium and aluminum reactive metals as the research object.Starting from the initial reaction temperature,combined with static combustion characteristic experiment and dynamic impact reaction characteristic experiment,this paper studies the factors affecting the combustion threshold of metal powder and metal fluoropolymer composite reactive materials.It has significance guiding for establishing a complete impact model and warhead design.The main research contents are as follows:(1)In this paper,through the study of dynamic impact reaction characteristics and static combustion experiments,the influencing factors of different particle sizes on the combustion threshold of reactive metals are analyzed,the relationship between initial reaction temperature and particle size is improved,and the relationship between particle size and initial reaction temperature is calculated.The results show that with the decrease of particle size,the relative specific surface area of particles increases and the initial reaction temperature decreases gradually.The initial reaction temperature of reactive metal powder decreases gradually with the increase of heating rate.(2)In the static combustion experiment,the effects of heating rate and different ratio of zirconium titanium composite powder on the combustion threshold were studied,and combined with theoretical analysis.When the mass ratio of zirconium was increased to 25%,the initial reaction temperature of composite powder reached the lowest.(3)In air atmosphere and fluorine environment,both static combustion characteristic experiment and dynamic impact reaction experiment show that the initial reaction temperature of aluminum is higher.However,the initial reaction temperature of reactive metals in fluorine environment is lower than that in air atmosphere.(4)In the dynamic impact reaction experiment,the elastic modulus of aluminum is low,and aluminum polytetrafluoroethylene is easy to squeeze and deform,reducing the gap between aluminum particles,resulting in more compact materials;under the same impact temperature rise,the unloading temperature of aluminum polytetrafluoroethylene is higher,and its energy release effect is better than that of zirconium polytetrafluoroethylene and titanium polytetrafluoroethylene.