Mechanochemical synthesis of alumina nanoparticles
محل انتشار: مجله علم مواد و مهندسی ایران، دوره: 6، شماره: 1
سال انتشار: 1387
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 55
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شناسه ملی سند علمی:
JR_IJMSEI-6-1_005
تاریخ نمایه سازی: 26 مرداد 1402
چکیده مقاله:
Abstract: Nano- size alumina particles have been synthesized by mechanical activation of a dry powder mixture of
AlCl۳ and CaO. Mechanical milling of the above raw materials with the conditions adopted in this study resulted in
the formation of a mixture consisting of crystalline CaO and amorphous aluminum chlorides phases. There was no
sign of chemical reaction occurring during milling stage as evidenced by x-ray diffraction studies. Subsequent heat
treatment of the milled powder at ۳۵۰ºC resulted in the occurrence of displacement reaction and the formation of
Al۲O۳ particles within a water soluble CaCl۲ matrix. The effect of higher temperature calcinations on the phase
development in this powder mixture was followed by X-ray diffraction (XRD) analysis and scanning electron
microscope ( SEM). Differential thermal analysis (DTA) was used to compare the thermal behavior between the
milled and unmilled powders. Perhaps the most important result in this study was the observation of á-Al۲O۳ phase
at a very low temperature of ۵۰۰ºC.
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