Aluminum　(Al)　particles　are　widely　used　in　propellants,　thermite　and　explosives.　However,　its　energy　release　process　is　still　not　thoroughly　investigated.　In　this　paper,　the　reaction　properties　of　Al　particles　at　low　and　high　heating　rates　were　investigated　using　a　thermal　analysis　system　and　a　single-particle　combustion　system,　respectively.　At　a　low　heating　rate　(10°C/min),　when　the　temperature　is　raised　to　1200°C,　the　oxidation　efficiency　of　Al　(which　can　also　be　regarded　as　the　average　oxidation　rate)　increases　first　and　then　decreases　as　the　oxygen　concentration　increases.　In　addition,　XRD　results　of　intermediate　oxidation　products　under　air　show　that　the　oxidation　of　Al　particles　deepens　with　increasing　temperature.　The　SEM　results　reveal　that　broken　particles　and　large-size　aggregates　gradually　appear　in　the　sample　as　the　temperature　increases,　and　the　surface　of　the　Al　particles　becomes　rougher.　At　high　heating　rate　(combustion),　with　the　increase　of　oxygen　concentration,　the　probability　of　microexplosion　of　Al　particles　increases　from　19.77　%　under　air　to　82.67　%　under　100　%　O2.　Furthermore,　the　combustion　time　gradually　decreases　with　the　increase　of　oxygen　concentration,　while　the　average　mass　burning　rate　gradually　increases　from　1.65　g/ms　under　air　to　2.73　g/ms　under　100　%　O2.　Based　on　the　analysis　of　the　surface　structure　of　the　intermediate　oxidation　products　and　the　microexplosion　of　single　particles,　it　is　believed　that　the　difference　of　the　reaction　law　of　Al　particles　at　different　heating　rates　may　be　related　to　the　structural　evolution　behavior　of　the　oxide　film.　This　study　provides　basic　data　support　for　understanding　the　heat　release　behavior　of　Al　particles.　©　2025