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1、引言为了予测复合固体推进剂的弹道性能,必须要知道推进剂中各组份的粒度或表面积。在塑料型推进剂的制造过程中固体粒子会发生机械破碎,尽管如此,仍发现高氯酸铵的初始表面积与推进剂的弹道性能有关。爆炸物研制公司(ERDE)测量高氯酸铵表面积的作法是采用以空气渗透法为基础的菲希尔(Fisher)筛分机。由于塑料型推进剂中使用的高氯酸铵的比表面积范围通常为1000~9000cm~2/cm~3(0.051~0.46m~2/g),因此,菲希尔法完全能满足这一要求。为了生产较高燃速的推进剂,爆炸物研制公司最近研究的推进剂配方中含有更细的高氯酸铵(9000~10000cm~2/cm~3)。在端羧基聚丁二烯和端羟基聚丁二烯两种橡胶型推进剂中,即
1, Introduction In order to predict the ballistic performance of composite solid propellant, it is necessary to know the particle size or surface area of each component in the propellant. Solid particles break down mechanically during the manufacture of plastic propellants. Nevertheless, it was found that the initial surface area of ammonium perchlorate was related to the projectile’s ballistic behavior. The ERDE’s method for measuring ammonium perchlorate surface area is based on the Fisher permeation based air screening machine. Since the specific surface area of ammonium perchlorate used in plastic propellants is usually in the range of 1000 to 9000 cm 2 / cm 3 (0.051 to 0.46 m 2 / g), Fisher’s method can completely satisfy this requirement . In order to produce higher burning rate propellants, the explosives development company recently studied propellant formulations containing finer ammonium perchlorate (9000 to 10,000 cm 2 / cm 3). In the terminal carboxyl polybutadiene and hydroxyl-terminated polybutadiene two rubber propellants, namely