为了降低含超细AP的AP-CMDB推进剂的机械感度,将类球形超细AP加至CMDB推进剂中,通过扫描电子显微镜获得了推进剂的断面微观形貌; 分别研究了类球形超细AP对推进剂密度、力学性能、燃烧性能和机械感度的影响。结果 表明,类球形AP表面较光滑,在推进剂中分散较均匀,但与双基组分间存在部分界面脱粘现象; 添加类球形超细AP对AP-CMDB推进剂的密度没有影响; 可以有效提高推进剂的燃速,含类球形AP的AP-CMDB推进剂在10MPa时燃速从60.12mm/s提高至63.03mm/s; 大幅降低推进剂的机械感度,特性落高(H50)提高了15.7cm,摩擦感度(P)降低了32%; 但同时降低了推进剂的抗冲强度,-40℃时抗冲强度从5.22kJ/m2降至4.12kJ/m2,其原因与类球形AP的热分解性能、表面形貌、分散均匀性及与双基组分间的界面情况有关。
To reduce the mechanical sensitivity of AP-CMDB propellant with ultrafine AP, the spheroidal ultrafine AP was added into CMDB propellant. The microstructure of the propellants were obtained by scanning electronic microscope. The effects of spheroidal ultrafine AP on the densities, mechanical properties, combustion performance and mechanical sensitivities of the propellant were investigated. The results show that the surface of spheroidal ultrafine AP is more smooth and it has a better dispersion uniformity in the propellant. However, there are interface debonding between spheroidal ultrafine AP and double base matrix. The density is not changed while the burning rate of AP-CMDB propellant with spheroidal ultrafine AP at 10MPa is increased from 60.12mm/s to 63.03mm/s. The mechanical sensitivities of AP-CMDB propellants with spheroidal ultrafine AP are reduced greatly. The characteristic drop height H50 is increased by 15.7cm and the friction sensitivity P is reduced by 32%. However, the impact strength of the propellant is reduced from 5.22kJ/m2 to 4.12 kJ/m2 at -40℃.The reasons maybe attributed to the thermal decomposition, microstructure, dispersion uniformity of spheroidal ultrafine AP, and the interface bonding between AP and double base matrix.
