Oxidation properties of nanometer aluminium powders

The DSC/TG、XRD and SEM were used to characterize the thermo-reaction properties of nanometer aluminum powders and micro-aluminum under air.The different oxidation condition of these two kinds of powders was studied.The experimental results confirm the different thermo-reaction properties between nanometer aluminum powders and micrometer aluminum.Nanometer aluminum powders would not be oxidized under 550℃,and micrometer aluminum would not be oxidized markedly till 950℃.Nanometer aluminum powders could be obviously oxidized after sintered at 1050℃ for 30min in air and α-Al2O3 particles could be formed at the particle surface.The obtained α-Al2O3 powders has no obvious agglomeration,spherical shape and a mean particle of 100 nm.