Volume 29, Issue 1 (Jun 2010)                   jame 2010, 29(1): 1-8 | Back to browse issues page

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M. Babashahi, M.H.Enayati, M. Salehi, A. Monshi. Phase Transformation of Silicon and Silica During Ball Milling . jame 2010; 29 (1) :1-8
URL: http://jame.iut.ac.ir/article-1-506-en.html
Department of Materials Engineering, Isfahan University of Technology , mbabashahi@yahoo.com
Abstract:   (7316 Views)
In the present study phase transformation of silicon and silica during milling in different atmospheres was investigated. The silicon powder was subjected to high energy ball milling in ammonia (25%) atmosphere. The milled powder was subsequently annealed at 1200 ◦C for 1 hour. In another test a mixture of AlN and amorphous silica (micro silica) was subjected to high energy ball milling. The milled powder mixture was subsequently annealed at 1200 ◦C for 2 hours. Phase analysis of the as milled and annealed powders was performed by X-ray diffractometery (XRD). Powder morphology was also examined using a scanning electron microscope (SEM). Results showed that ball milling of silicon in ammonia formed an amorphous phase which transformed to quartz on further milling. After annealing quartz, cristobalite and another oxide phase called O phases were developed on XRD patterns. Ball milling of AlN and amorphous silica led to the transformation of amorphous silica to stishovite phase. This process was completed after annealing..
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Type of Study: Research | Subject: General
Received: 2015/02/9 | Accepted: 2015/05/5 | Published: 2015/05/5

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