首次通过水相悬浮造粒法制备了硝化纤维素(NC)/N-丁基硝氧乙基硝胺(Bu-NENA)/1,3,5-三硝基-1,3,5-三氮杂环己烷(RDX,40%,质量分数)复合球形药。采用扫描电镜、差示量热-热重、爆炸概率法、甲基紫法、密闭爆发器等方法,研究了NC/Bu-NENA/RDX复合球形药的微观结构、热分解性能、机械感度、热安定性和燃烧性能。结果表明:水相悬浮造粒法制备的NC/Bu-NENA/RDX复合球形药球形度高、结构致密、微观结构缺陷少;NC/Bu-NENA/RDX复合球形药热分解活化能为144.5kJ/mol,与NC/NG/RDX复合球形药相比,提高了5.1%,热稳定性增加;Bu-NENA替代NG后,复合球形药摩擦感度和撞击感度分别降低了57.8%和90.1%,热安定性提升了57.1%;燃烧性能方面,NC/Bu-NENA/RDX复合球形药起始缓燃,燃烧性能稳定。
Nitrocellulose (NC)/N-butyl nitrooxyethylnitramine (Bu-NENA)/1,3,5-trinitrohexahydro-s-triazine (RDX,40wt%) composite spherical propellant was prepared by aqueous suspension granulation for the first time.The microstructure,thermal decomposition properties,mechanical sensitivity,thermal stability and combustion properties of NC/Bu-NENA/RDX were studied by scanning electron microscope (SEM),differential calorimetry-thermogravimetry(DSC-TG),explosion probability method,methyl violet method and closed explosive device.The results shown that the NC/Bu-NENA/RDX prepared by aqueous suspension granulation method had high sphericity,compact structure with few microstructure defects.The activation energy of thermal decomposition of NC/Bu-NENA/RDX was 144.5kJ/mol,which was 5.1% higher than that of NC/NG/RDX composite spherical propellant,and the thermal stability of it was increased.After replacing NG with BU-NENA,the friction sensitivity and impact sensitivity of the propellant were reduced by 57.8% and 90.1%,respectively,and the thermal stability was improved by 57.1%.In terms of combustion performance,NC/Bu-NENA/RDX shown slow initial combustion rate and stable combustion performance.
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