摘要
针对铝粉燃烧不充分、释能效率慢以及点火延迟长等问题,采用静电喷雾法制备了纳米铝@聚偏二氟乙烯@六硝基六氮杂异伍兹烷(nAl@PVDF@CL-20)复合含能微球,通过调节溶剂种类、电场强度、粘结剂含量等参数来优化微球形貌结构及其粒径尺寸。结果表明,采用体积比为2:1的二甲基甲酰胺/乙酸乙酯(DMF/EAC)混合溶剂可在聚偏二氟乙烯(PVDF)含量为5%、电极电压为14 kV的情况下获得尺寸在2.37~2.67μm之间、元素映射显示组分均匀分散的微球样品。同时,微球内的CL-20在雾化、沉积过程中由于重结晶而发生晶型转变,由ɛ-CL-20转变为β-CL-20。此外,改为采用nAl可以显著改善微球的释能效率和燃烧性能,并在其含量达到40%时获得最大平衡压力1.17 MPa以及最大升压速率6.99×10^(3)kPa·ms^(-1)。
To address the issues of incomplete aluminum powder combustion,slow energy release efficiency and prolonged ignition delay,nAl@PVDF@CL-20 composite energetic microspheres were fabricated via electrostatic spray technique.The morphological structure and particle size distribution were optimized by adjusting parameters,including eolvent type,lectric field intensity and sand binder content.Experimental results demonstrated that the uniform microspheres with size distribution of 2.37-2.67μm and homogeneous component dispersion were achieved using a dimethylformamide/ethyl acetate(DMF/EAC)mixed solvent at the volume ratio of 2∶1,with the PVDF content fixed at 5%and electrode voltage maintained at 14 kV.Concurrently,a crystal phase transition of CL-20 fromɛ-CL-20 toβ-CL-20 occurred during atomization and deposition processes due to recrystallization.Furthermore,the adoption of nAl significantly enhanced the energy release efficiency and combustion performance of microspheres.The optimal performance was attained at 40%nAl loading,achieving a maximum equilibrium pressure of 1.17 MPa and a peak pressure rise rate of 6.99×10^(3)kPa·ms^(-1).
作者
郭永卓
王重阳
郝嘎子
肖磊
王苏炜
姜炜
GUO Yong-zhuo;WANG Chong-yang;HAO Ga-zi;XIAO Lei;WANG Su-wei;JIANG Wei(National Special Superfine Powder Engineering Research Center of China,School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210014,China)
出处
《含能材料》
北大核心
2025年第11期1265-1273,共9页
Chinese Journal of Energetic Materials
基金
国家自然科学基金(U2141202,21805139),中央高校基本科研业务费专项资金(30923011018)。
