含能材料2026，Vol.34Issue(4)：425-434,10.DOI:10.11943/CJEM2026021
粒径对Al-Li-Mg合金点火燃烧性能的影响
Effect of Particle Size on the Ignition and Combustion Performance of Al-Li-Mg Alloys
摘要
Abstract
To investigate the influence mechanism of particle size of Al-Li-Mg alloy on its ignition and combustion behavior,Al-Li-Mg alloys with median particle sizes of 9,13,16,and 24 μm was selected and tested by using of the laser particle size an-alyzer,scanning electron microscopy,X-ray diffractometry,simultaneous thermal analyzer,oxygen bomb calorimeter,and a la-ser ignition experimental setup combined with high-speed photography and fiber optic spectrometry.Results show that with the increase in particle size of the Al-Li-Mg alloy,the ignition delay time sharply decreases and then stabilizes,dropping from 135 ms to 51 ms,and further to 15 ms and 18 ms.The combustion intensity decreases from 7300.4 to 1721.6,while the com-bustion duration slightly prolongs and then remains largely stable from 857 ms to 928 ms,until to approximately 920 ms.A com-prehensive comparison indicates that the Al-Li-Mg alloy with a particle size of 13 μm achieves a balance among ignition delay(51 ms),combustion duration(928 ms),and combustion intensity(6041.8).The study reveals that particle size affects the re-action pathway of the Al-Li-Mg alloy by regulating the competitive mechanism between heat conduction efficiency and elemen-tal diffusion.An increase in particle size limits heat conduction and promotes the migration and enrichment of Li and Mg toward the surface,which forms a temperature gradient and induces a"micro-explosion"effect,shortens the ignition delay,but reduces combustion completeness and combustion intensity.关键词
金属燃料/Al-Li-Mg合金/激光点火/粒径Key words
metal fuel/Al-Li-Mg alloy/laser ignition/particle size分类
军事科技引用本文复制引用
曾绮卉,王鼎程,陈玉坤,常亚蒙,李春涛,蒲旸,罗鹏凯,李伟,王芳..粒径对Al-Li-Mg合金点火燃烧性能的影响[J].含能材料,2026,34(4):425-434,10.基金项目
国家自然科学基金(U25B20101,62433017) （U25B20101,62433017）
