NG含量对改性单基发射药燃烧性能的影响

Effect of NG Content on the Burning Performance of Modified Single-base Gun Propellant

以高氮量5/7单基发射药为基体药粒,通过先浸渍吸收NG、后吸收聚酯钝感剂NA的两步工艺制备出改性单基药,在制备过程中,NA含量恒定,浸渍NG的质量分数为5%、10%和15%,制备出3种NG含量的改性单基药样品RN-a、RN-b和RN-c。采用密闭爆发器试验和30mm弹道炮内弹道试验,研究了NG含量对改性单基药燃烧性能的影响。结果表明,所制备的3种改性单基药样品的燃烧渐增性均优于基体药;在保持最大膛压不增加的情况下,弹丸初速较5/7单基药装药分别提高36.9、91.7和57.4m/s。在制备工艺过程中,通过调节NG的含量,能够改善改性单基药的燃烧性能,实现大幅度提高炮口初速的目的。

The micro-pores oblate spherical powder（MOSP） was prepared by changing the shape of MOSP,using different concentration of salt solution as internal water phase,and chemical foaming.The porosity and hole structure of MOSP were characterized by measuring bulk density and viewing section structure by SEM.The results indicate that by changing spherical powder to oblate spherical powder,both small and big hole in MOSP become through hole structure.The structure of small and big hole changes from closed structure to through structure as the concentration of salt solution in the internal water phase is higher than 0.20 g/cm3.All of the small hole structure are closed in MOSP by chemical foaming,different amounts of solvent evaporated in chemical foaming has a great impact on big hole structure,most of the big hole are through structure when the solvent is evaporated 29% of total solvent.The three ways which were used in the experiment can effectively control the through structure in MOSP.