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Property of Nanometer Aluminium Powders and Its Effect on Preparation of Alumina Powders by Precipitation Method

Xing Hu

Abstract

Property of nanometer aluminum powders is studied in this paper.Al(OH)_3 gel was synthesized by using Al(NO_3)_3·9H_2O,ammonia and nanometer aluminium as raw materials through precipitation method.α-Al_2O_3 powders were obtained by calcining the precursor at high temperature.Differential scanning calorimetry(DSC)and thermogravimetry(TG) were used to analyze nanometer aluminum powders,composite powders crystallization and weight changing with temperature.Phase identification of the powders was determined by XRD.Particle size and shape of the powders were observed by SEM.It is found that aluminum additives can also reduce the transformation temperature of α-Al_2O_3.

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Key concepts: Materials science, Nanometre, Aluminium, Calcination, Differential scanning calorimetry, Crystallization, Precipitation, Thermogravimetry