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为实验研究推进剂配方对基于端羟基聚丁二烯粘结剂(HTPB)/过氯酸铵氧化剂(AP)/铝粉燃料(Al)的富燃复合推进剂力学性能的影响。综合混合、浇铸和固化影响因素,制备了11种不同推进剂试样10 kg,并在25℃下采用Zwick试验机以50 mm·min-1的速率对标准JANNAF试件进行了测试。结果表明,当粘结剂的含量从74.5%减小到34.5%、以AP和Al替代时,推进剂的应变减小,抗拉强度、杨氏模量和硬度增大。AP的颗粒尺寸和含量对推进剂的力学性能有影响,AP细颗粒可充当了活性的填充物并增强复合推进剂的力学性能,当AP颗粒的平均直径从55.9μm减小到9μm时,推进剂的抗拉强度、杨氏模量和硬度增大,应变减小,表明该类富燃复合推进剂力学性能主要受到粘结剂和AP平均颗粒尺寸的影响。
The effect of propellant formulation on the mechanical properties of fuel-rich composite propellant based on hydroxyl terminated polybutadiene binder (HTPB) / ammonium perchlorate oxidizer (AP) / aluminum powder fuel (Al) was investigated experimentally. A total of 11 kg samples of 11 different propellants were prepared by comprehensively mixing, casting and curing factors. The standard JANNAF specimens were tested at 25 mm at a rate of 50 mm · min-1 using a Zwick tester. The results show that when the binder content is reduced from 74.5% to 34.5%, with the substitution of AP and Al, the strain of the propellants decreases and the tensile strength, Young’s modulus and hardness increase. The particle size and content of AP affect the mechanical properties of propellants. AP fine particles can act as active filler and enhance the mechanical properties of composite propellants. When the average diameter of AP particles is reduced from 55.9μm to 9μm, Tensile strength, Young’s modulus and hardness increase, strain decreases, indicating that the mechanical properties of this type of fuel-rich composite propellants are mainly affected by the binder and AP average particle size.