年間 6 号発行
ISSN 印刷: 2150-766X
ISSN オンライン: 2150-7678
Indexed in
NANO- AND MICROMETER-SCALE ALUMINUM POWDER OXIDATION IN CARBON DIOXIDE
要約
The thermal oxidation of fine aluminum (Al) powders in carbon dioxide (CO2) gas was investigated for the purpose of metal-based propulsion fuel development. The thermal behavior and reaction energy was studied using simultaneous thermogravimetric (TG) analysis and differential scanning calorimetry (DSC). The reactivities of Al powders with nanometer and micrometer-scale average particle sizes were compared. The particle morphology was examined at different stages of the process using field emission gun scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM). The corresponding chemical changes were analyzed by X-ray diffraction spectrometry (XRD) and energy dispersion X-ray spectrometry (EDS). It is found that nano- and micrometer-scale Al powders exhibited different calorimetric behavior; primarily oxidation occurred at a much lower temperature for nanopowders compared to micropowders. The mechanism of the oxide transformation and growth, particle deformations, and hollow oxide shells are discussed, along with the involvement of carbon in the reaction.
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Lee Sanghyup, Noh Kwanyoung, Lim Jihwan, Yoon Woongsup, Thermo-physical characteristics of nickel-coated aluminum powder as a function of particle size and oxidant, Chinese Journal of Mechanical Engineering, 29, 6, 2016. Crossref