Research On Preparation And Damage Experiment Of The Light Rare Earth Metal Hydride Reactive Fragment

Reactive fragment is not only the important content of the combination of efficient mutilate technology and active material which is one of the categories of Energetic material,but the fangment and the breaking chip kill warhead technology also become a hot research topic in the field of efficient mutilate.Compared with traditional inert metal fragment,the energetic one attacked goals the deeply and efficiently damage by collided with targets under the action of the secondary reaction of mechanical throughout of kinetic energy and active material rapidly.Different from traditional energetic materials,The light rare earth hydride have a very high energy.For the application of reactive fragment,it not only could burn out a large amount of heat,but also could improve the damage power of fragment and explore the damage effect of goal.This paper studied the damage effect of target penetration caused by light rare earth hydride reactive fragment with the method of combining theoretical analysis and experimental research.This paper first explored the design of reactive fragment,put forward basic ideas and studied mutilate reaction mechanism of light rare-earth hydride reactive fragment.Combining with the efficiency damage weapon requirements,the paper carried out the following works:1)The light rare earth hydride cerium hydride?CeH₃?was preparated by the method of direct hydrogenation high temperature adsorption,yield was 99.8%.The cerium hydride was treated by stearic acid with a mass of 4%,5%,7%and 10%in the perspective of stability.The coating effect,combustion calorific value and stability of cerium hydride treated were characterized by scanning electron microscopy?SEM?,X-ray powder diffraction?XRD?,oxygen bomb calorimeter,BAM friction sensitivity tester,BAM drop hammer impact sensitivity of the instrument test.The calorific value of CeH₃ is 16.3641MJ/kg.The result of the 4%SA coating effect is good and the stability is high.2)According to the oxygen balance theory,the ratio of CeH₃ and ammonium perchlorate?AP?was prepared.The design formula of active fragment system is negative oxygen balance.The thermal decomposition of AP with different contents of CeH₃ were explored by means of thermogravimetric analysis?TG?and differential scanning calorimetry?DSC?.The result of 60%of CeH₃ maing the peak high-temperature of AP reduce the 87?,while the decomposition heat of AP increasing from 0.44 kJ/g to 2.23 kJ/g showed that the catalytic effect of thermal decomposition process of AP is obvious.3)Active shell fragments was designed by the active fragment impact state theory.The 45^#steel and LY12 aluminum shell fragments were selected as materials,the fragments were designed into the shape of cylindrical and rectangular shape and between the rear cover and the shell fragments were thread occlusion reinforcement.The design could realize the fragment of reactive fragments effective shock initiation,reached the emission intensity of shell fragments.4)The damage experiment were designed and layout according to the damage principle of reactive fragments.The reactive fragments were ejection drived and done fragment impact initiation experiments.Compared with normal inert metal fragments.the influence factors of fragment shape and diameter and material were studied on the shock initiation process of reactive fragments.Through the damage experiment of the reactive fragments penetrating target board,the target plate aperture which was penetrated by the initiation reactive fragments was?18²6mm,however the diameter was?15¹7mm when there was no initiation.Inert fragments only penetrated penetration depth of the target board,and could not penetrate the target board entirely.The pore size was less than the circumstances of initiating reactive fragment penetration and the target plate aperture which was penetrated by the inert fragment was?15¹8mm.The target plate aperture which was penetrated by the initiation reactive fragments was two times of the diameter of the fragment.Light rare earth metal hydride reactive fragments had high penetration damage ability than inert metal fragments.According to the analysis of the experimental data,the 45^#steel fragments have better probabilities of detonation than the LY12 aluminum fragments.It has a positive role in promoting to enhance the damage-power of fragmentations kill warhead by the study of light rare earth metal hydride reactive fragment,which can provide references to the research and development of anti missile engineering.