Refinement Behavior of Scrap Silicon by Mechanical Milling
Rumman Md. Raihanuzzaman,
Jar Myung Koo.
In this research, the refinement behavior of scrap silicon during mechanical milling with varying time was observed.
Initial premilled Si powder with 106µm size was milled using high energy ball milling equipment in order to produce
commercially applicable 10 µm target Si powders. Milling time was changed from 1 min to 60min while the characteristics
and morphological changes of the powders according to the milling time were observed by Scanning Electron
Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray diffractometer (XRD). The average particle size
was found to have reached 10μm after a short milling time of 20~30 min, while 60min of milling yielded fine spherical
particles of around 3.5 µm, surrounded by fine nanoparticles. In addition, it has also been found that there is presence of
nano Si particles after 60 minutes of milling. The refinement mechanism suggests that the longer the milling time, the
finer the powder size becomes with identifiable stages observed in between.
Keywords: High-energy milling, microstructure, milling time, nanoparticles, refinement, silicon scrap.
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