Study On Stability And Safety Of High Energy And Low Sensitive Gun Propellant

Modern advanced weapon systems have made great demands on ammunition and high survivability,and research and development of high-energy and low-sensitive gun propellants have become the main trend of gun propellant in the 21st century.This article mainly discusses the effects of components~'content on the stability and safety of high-energy and low-sensitive gun propellants.It is pointed out that the formulation system with energetic binders and high energy additives can meet the requirements of high energy and low sensitivity of gun propellants.Nine different formulations of RDX-based gun propellants were prepared using RDX and nitroguanidine(NQ)as energetic fillers.RDX often causes a high explosive temperature of the gun propellant and causes serious ablation of the tube.The addition of the NQ will not only negatively affect the gun propellant energy,but also reduce the gun propellant explosion to some extent.NQ plays a role in reducing sensitivity of RDX-based gun propellant.When RDX alone was used as a high-energy filler,five different formulations of GAP-ETPE gun propellant were prepared by changing the gun propellant binder and partially replacing nitrocellulose(NC)with a GAP-ETPE elastomer as a binder.In this paper,the stability of gun propellant was evaluated by vacuum stability(VST)method and differential scanning calorimetry(DSC).When the air volume of 1 g sample in the VST method is less than 2 mL,the stability meets the requirement of the national militarystandard,and the smaller the venting volume,the better its stability.The DSC method judges the peak temperature of the liberating heat when the heating rate tends to zero.The larger the peak temperature,the better the stability;The safety was measured by thermal sensitivity(5s burst point),impact sensitivity(characteristic fall height),and electrostatic spark sensitivity.The higher the temperature of the 5s flash point,the greater the value of the characteristic fall,indicating that the safety of the gun propellant is better.The RDX-based gun propellants VST and DSC experimental results show that when the other components of the gun propellant do not change,the stability and safety of theRDX-based gun propellant will decrease with the NC nitrogen content,the relative content of the NC/NQ,and NC The relative content of/RDX decreases.And RDX-based gun propellants are insensitive to static spark sensitivity;The GAP-ETPE gun propellant VST experimentalresults show that the stability of the gun propellant system after plasticization of a smallamount of TEGDN is reduced,and the DSC result is contrary.By adding TEGDN,reducing the NC content increases the safety of the gun propellant.GAP-ETPE gun propellants show insensitivity to static spark sensitivity.The experimental results show that different experimental methods may causeinconsistent conclusions due to different mechanism of action of gun propellant components in different experimental environments,and GAP-ETPE gun propellants are superior toRDX-based gun propellants in stability and safety.