纤维素甘油醚硝酸酯改善球扁发射药低温内弹道性能的研究

Improvement of Internal Ballistic Performance of Oblate Spherical Propellants at Low Temperature by Using Nitrate Glycerol Ether Cellulose

为解决添加高能固体组分的球扁发射药存在低温膛压偏高的问题,在不降低发射药能量的前提下,用纤维素甘油醚硝酸酯(NGEC)部分替代硝化纤维素,通过挤压成型工艺,制备了含有NGEC的球扁发射药,并对其外型、燃烧性能、内弹道性能、感度进行了研究。结果表明,添加NGEC后,球扁药药粒的外型均一、药粒尺寸一致性较好;球扁发射药的燃烧呈现出渐增性,且具有一定的钝感性,撞击感度降低了30%;内弹道性能得到改善,在+15、+50、-40℃时,最大膛压平均值分别降低10%、8%、15%,低温力学性能得到提高;在-40℃、破碎率为50%时,冲击高度和抗冲击强度分别提高了10.52%、17.32%。因此NGEC有望应用于球扁发射药。

In order to solve the problem of high chamber pressure of oblate spherical propellant containing high-energy solids at low-temperature,and to avoid the reduction of propellant energy,spherical double-base propellants with nitrate glycerol ether cellulose(NGEC)were prepared.The effects of NGEC on the shape,combustion performance,interior ballistic performance and sensitivity of oblate spherical propellant were investigated.The results showed that the uniformity of shape and size of spherical propellant granules were good after adding NGEC.The combustion of propellants presented progressive burning,and the impact sensitivity decreased by 30%.The interior ballistic performance was improved.At+15,+50 and-40℃,the average maximum bore pressure decreased by 10%,8%and 15%.The low-temperature(-40℃)mechanical properties were improved,when the fragmentation rate was kept at 50%,and the high impact and impact resistance strength increased by 10.52%and 17.32%.NGEC is expected to be applied to spherical double-base spherical propellants.