TMETN含量和NC含氮量对TMETN/NG混合硝酸酯发射药力学性能的影响

Effects of TMETN Content and NC Nitrogen Content on the Mechanical Properties of TMETN/NG Mixed Nitrate Propellants

为了改善发射药的力学性能,在硝胺发射药配方基础上,用三羟甲基乙烷三硝酸酯(TMETN)取代部分NG、改变NC含氮量,制备了2个系列的TMETN/NG混合硝酸酯发射药样品;采用冲击试验机、材料试验机测试了3个不同温度(-40、20和50℃)下发射药的冲击强度和压缩强度;利用密闭爆发器测试了发射药在高压(p_m≈600MPa)下的燃烧性能。结果表明,在试验范围内,发射药的低温冲击强度随着TMETN质量分数的增加(0、5%、10%、15%、20%)而逐渐增加,高温和常温下则呈现相反的趋势,而压缩强度在不同温度下均呈现上升的趋势;随着NC含氮量由12.2%增至13.0%,在不同温度下发射药冲击强度和压缩强度均呈现先小幅增加后逐渐减小的趋势;在高压条件下,发射药样品在不同温度条件下的p—t、L—B曲线均光滑,符合管状发射药正常燃烧的变化规律,未出现明显的破碎现象。

To improve the mechanical properties of gun propellant,on the basis of formulation of nitramine propellant,two series of trimethylolethane trinitrate(TMETN)/NG mixed nitrate propellant samples were prepared by replacing part of NG with TMETN and changing the nitrogen content of NC.The impact strength and compressive strength of gun propellants at three different temperatures(-40,20,and 50℃)were tested using an impact tester and a material testing machine.The combustion performance of gun propellant at high pressure(p m≈600MPa)was tested by a closed bomb.The results show that the low temperature impact strength of the gun propellant increases gradually with the increase of TMETN mass fraction(0,5%,10%,15%,20%)in the experimental range,and the opposite trend appears at high temperature and normal temperature,while the compressive strength shows an increasing trend at different temperatures.As the nitrogen content of NC increases from 12.2%to 13.0%,the impact strength and compressive strength of the gun propellant show a trend of slight increase at first and then gradually decrease at different temperatures.Under high pressure conditions,the p-t and L-B curves of the gun propellant samples are smooth under different temperature conditions,which was consistent with the normal burning law of tubular propellant,and no obvious fragmentation phenomenon occurs.