Research On Orbit Damage Characteristics Of Copper Alloy Under Simulated Electromagnetic Emission Condition

Electromagnetic gun is a kind of advanced kinetic energy killing weapon made of electromagnetic launch technology.It can accelerate metal projectile by Lorentz force generated by electromagnetic field,make it carry kinetic energy needed to attack target,and effectively improve projectile speed and range.In this paper,aiming at the problem of interface damage between armature and rail during launching of electromagnetic track,the damage characteristics of two kinds of copper alloy track surface at different armature speeds after current-carrying friction experiment are analyzed and studied,and the solutions to improve the repeatable launching performance of track and reduce the launching loss of track surface are explored,so as to design a damage-resistant and long-term track.The material selection and modification of the lifetime electromagnetic launching track provide theoretical guidance.XRD,XPS,SEM,EDS and Brinell hardness analysis were carried out on the samples of ZrCrCu and BeCu alloys at different armature speeds after electromagnetic launching.It can be found that:ZrCrCu alloy from low speed to high Speed,the overall strength of CuAl2 peak is getting lower and lower,and the peak can hardly be seen at high speed.BeCu alloy from low-speed to high-speed,the overall strength of CuA12 peak is getting higher and higher,and it can not be seen at low-speed.Al peaks occur in the low,middle and high speed sections of BeCu alloys have high strength;After Joule heat treatment of high and low strength,the cladding layer of ZrCrCu alloys is thicker,the cladding layer of BeCu alloys is thinner,and the faster the cladding layer 1s,the thicker the cladding layer is;The hardness of ZrCrCu alloy cladding layer increases first,then decreases and then increases with the increase of Joule heat.The hardness of BeCu alloys cladding layer increases first and then decreases with the increase of Joule heat,indicating that the hardness of cladding products and Joule thermal annealing affect the hardness of samples;The hardness and wear resistance of BeCu alloys are better than that of ZrCrCu alloys,and there are obvious differences in the continuous service performance and service life of beryllium-copper alloys.The samples of ZrCrCu and BeCu alloys at different armature speeds after electromagnetic launching were electrochemically tested,characterized by SEM,EDS and DSC thermodynamics.It can be found that:After electromagnetic emission,the oxidation resistance and corrosion resistance of ZrCrCu and BeCu alloys track decrease.With the increase of Joule heat J,the corrosion resistance of ZrCrCu alloy track decreases first and then increases,while that of BeCu alloy track decreases continuously with the increase of Joule heat J;The thickness of oxide layer after BeCu alloys orbital polarization is lower than that of ZrCrCu alloys orbital,which is the same as that before polarization test;Compared with BeCu alloy,ZrCrCu alloy is simpler in heating phase transformation and weaker in oxidation resistance.Therefore,BeCu alloy is a more suitable material for electromagnetic launch orbit.