Preparation of Nanocrystalline Calcium Aluminate Powders
Tóm tắt
Nanocrystalline calcium aluminate (CaAl2O4and Ca3Al2O6) powders have been prepared by pyrolysis of complex compound of aluminium and calcium with triethanolamine (TEA). The soluble metal ion-TEA complex forms the precursor material on complete dehydration of the mixtures of the complex of calcium-TEA and aluminium-TEA. The single-phase CaAl2O4and Ca3Al2O6powders have resulted after heat treatment at 800° and 1000°C, respectively. The precursors and the heat-treated final powders have been characterized by X-ray diffractometry (XRD), differential thermal and thermogravimetric analysis TG/DTA, and transmission electron microscopy (TEM). The average particle sizes as measured by transmission electron microscopy studies are around 30–40 nm and 25–30 nm for CaAl2O4and Ca3Al2O6powders, respectively. These nano-sized powders are very suitable for making various nano-composites with polymers and inorganic compounds.
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