Powder characteristics of Fe2O3 nanopowder agglomerates fabricated by high energy ball milling at various speed and spray-drying processes
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This study investigated the effects of milling speed on the structure evolution of spray-dried (SD) Fe2O3 agglomerate as aprecursor for fabricating Fe nanopowder agglomerate. For fabrication, the milling speed was controlled at four differentrotation speeds of 1000, 1400, 1800 and 2400 rpm (revolution per minute) for 10 hrs. For quantitative analysis, amicrostructural observation was conducted. The particle size first decreased rapidly until it finally reached a saturation valueof about 60 nm as the milling rpm increased to 1800 rpm. Moreover, it was found that excessive milling energy was consumedto form secondary agglomerates in spherical agglomerate at milling condition of 2400 rpm. The evolution of powdercharacteristics is also discussed in terms of the crystallite size and surface area and then compared to the particle sizedistribution analyzed by the microstructure.
Abstract
This study investigated the effects of milling speed on the structure evolution of spray-dried (SD) Fe2O3 agglomerate as aprecursor for fabricating Fe nanopowder agglomerate. For fabrication, the milling speed was controlled at four differentrotation speeds of 1000, 1400, 1800 and 2400 rpm (revolution per minute) for 10 hrs. For quantitative analysis, amicrostructural observation was conducted. The particle size first decreased rapidly until it finally reached a saturation valueof about 60 nm as the milling rpm increased to 1800 rpm. Moreover, it was found that excessive milling energy was consumedto form secondary agglomerates in spherical agglomerate at milling condition of 2400 rpm. The evolution of powdercharacteristics is also discussed in terms of the crystallite size and surface area and then compared to the particle sizedistribution analyzed by the microstructure.
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