降低丁羟高燃速推进剂机械感度研究

为了降低丁羟高燃速推进剂机械感度,考察了液体二茂铁燃速催化剂(EMT)含量、氧化剂高氯酸铵(AP)粒径及配比等对丁羟高燃速推进剂机械感度的影响,并通过差示扫描-热重(DSC-TG)热分析研究了AP/EMT体系热分解特性与机械感度的相关性。结果表明,细AP含量增加或细AP粒径减小时,推进剂药浆的摩擦感度和撞击感度均呈增加趋势;EMT提高了AP的高温分解反应速率常数和分解热,是含EMT的高燃速推进剂机械感度升高的微观原因,降低EMT含量,可以降低推进剂的机械感度;胺盐类降感剂GZJ-01和导电态聚苯胺降感剂DBJ-01对降低丁羟高燃速推进剂的机械感度无协同效应;细AP包覆和采用铜盐燃速催化剂(GRCJ)取代EMT均可以降低丁羟高燃速推进剂的机械感度。

Study on Decreasing the Mechanical Sensitivity of HTPB Propellant with High Burning Rate

To decrease the mechanical sensitivity of hydroxyl terminated polybutadiene(HTPB) propellant with high burning rate, the effects of liquid ferrocene combustion catalyst (EMT) content, particle size and ratio of oxidant AP on the mechanical sensitivity of HTPB propellant with high burning rate were studied. The correlation between thermal decomposition property and mechanical sensitivity of AP/EMT system was studied by means of DSC-TG thermal analysis and mechanical sensitivity test. The fraction and impact sensitivity of the propellant slurry increased with the increase of fine AP content or the decrease of fine AP particle size. The decomposition rate constant and heat of AP at high temperature was increased by EMT, which explained the increased mechanical sensitivity of the high burning rate propellants. The mechanical sensitivity of the propellant might be reduced by reducing content of EMT. Synergistic effect was not found between the amine salt desensitizer of GZJ-01 and electronic conductive polyaniline DBJ-01 on decreasing the mechanical sensitivity of high burning rate HTPB propellant. The mechanical sensitivity of the high burning rate propellants can be decreased by coating with fine AP and replacing EMT with GRCJ.