Research On Preparation,Packaging And Performance Of High Temperature Resistant Grease For Penetrating Projectile

In order to reduce the penetration resistance of the ground penetrating projectile to increase its penetration power.According to the principle of bionic self-lubricating drag reduction,it is aimed at the experimental projectile with tiny pit structure on the surface.In this paper,the development of lubricating grease and seal coating has been completed,and the dynamic penetrating projectile reduction characteristics of the scaled-down projectile have been studied.The grease in the tiny pits on the surface of the projectile is mainly sealed by the coating developed in this paper.When the target is contacted,the surface coating of the projectile is broken,and the grease in the pit flows to the surface of the projectile after being squeezed by friction and forms a continuous oil film to achieve the effect of lubrication and drag reduction of the projectile.In order to ensure that the projectile has a good lubrication effect during the penetration process,a grease with good lubrication effect under extreme pressure and high temperature conditions has been developed.The enthalpy change and entropy change of the grease thickener are discussed by Benson Method,and the basic formula of grease was designed.Through single factor and response surface optimization experiments,the optimized scheme of grease was obtained.According to the optimized scheme,the dropping point of the grease is 363.3℃,and the extreme pressure and high temperature friction coefficient is 0.090.Other properties are good.At the same time,the physical and chemical properties of the grease have been tested,and it is believed that the grease has good properties.To prevent the grease in the surface pits from losing before the projectile contacts the target.In this paper,an encapsulation coating that can continuously form a film on the surface of elastic steel and grease is developed,and the basic formula of epoxy encapsulation coating is designed.Through single factor and response surface optimization experiments,the optimization scheme of the sealing coating on the surface of the projectile is obtained.According to the optimized scheme,the extreme pressure high temperature friction coefficient of the seal coating is 0.091,the corrosion current density is 3.36μA·cm^-2.The sealing coating can complete the task of sealing the grease in the tiny pits on the surface of the projectile.Finally,the grease and the developed packaging coating were applied to the experimental projectile with bionic holes on the surface.Through the dynamic test of the scaled projectile penetrating the C40 concrete test block,the frictional resistance of the projectile and the surface morphology after penetrating were obtained.Compared with a projectile without a bionic structure,the penetration depth of a projectile with a bionic result under the same conditions is increased by about 20%.Analyzing the morphology and crater status of the experimental projectile after penetration,it is believed that the grease and coating can play a role in lubrication and drag reduction,and enhance the penetration depth of the scaled projectile.