3D printed hybrid rocket fuels with mAl core-shell particles coated with polyvinylidene fluoride and polydopamine:Enhanced combustion characteristics  

作　　者：Qihang Chen Xiaolong Fu Weitao Yang Suhang Chen Zhiming Guo Rui Hu Huijie Zhang Lianpeng Cui Xu Xia 

机构地区：[1]Xi'an Modern Chemistry Research Institute,Xi'an,710065,China [2]School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials/Shaanxi University Key Laboratory of High-Energy Chemical Materials,Northwest University,Xi'an 710069,China [3]School of Mechatronics Engineering,North University of China,Taiyuan,030051,China

出　　处：《Defence Technology(防务技术)》2025年第4期59-70,共12页Defence Technology

基　　金：funded by the National Natural Science Foundation of China(Grant No.06101213);the National Natural Science Foundation of China(Grant No.22105160).

摘　　要：3D printing technology enhances the combustion characteristics of hybrid rocket fuels by enabling complex geometries.However,improvements in regression rates and energy properties of monotonous 3D printed fuels have been limited.This study explores the impact of poly(vinylidene fluoride)and polydopamine-coated aluminum particles on the thermal and combustion properties of 3D printed hybrid rocket fuels.Physical self-assembly and anti-solvent methods were employed for constructing composite mAl particles.Characterization using SEM,XRD,XPS,FTIR,and mCT revealed a core-shell structure and homogeneous elemental distribution.Thermal analysis showed that PVDF coatings significantly increased the heat of combustion for aluminum particles,with maximum enhancement observed in mAl@PDA@PVDF(denoted as mAl@PF)at 6.20 kJ/g.Subsequently,3D printed fuels with varying pure and composite mAl particle contents were prepared using 3D printing.Combustion tests indicated higher regression rates for Al@PF/Resin composites compared to pure resin,positively correlating with particle content.The fluorocarbon-alumina reaction during the combustion stage intensified Al particle combustion,reducing residue size.A comprehensive model based on experiments provides insights into the combustion process of PDA and PVDF-coated droplets.This study advances the design of 3D-printed hybrid rocket fuels,offering strategies to improve regression rates and energy release,crucial for enhancing solid fuel performance for hybrid propulsion.

关 键 词：Hybrid propulsion Regression rate 3D print fuels Micro aluminum CORE-SHELL mAl@PDA@PVDF 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]