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Preparation and Characterization of Nanocrystalline CaO-ZrO2 Powders by Microwave Pyrolysis

CaO(15%)-ZrO2 nano-powders were prepared by microwave pyrolysis in a multi-model chamber at the temperature ranging from 650°C to 800°C, with the precursor processed at different reaction temperature from 0°C to 80°C by chemical co-precipitation method. XRD and SEM techniques were used to characterize the phase transition and micrograph of powders. It is found that the content of m-ZrO2 phase decreased with the increasing of reaction temperature and pyrolysis temperature. The high dispersed and superfine nano-powders were obtained at the pyrolysis temperature of 750°C for 20 min at 80°C. And only cubic ZrO2 phase were detected in CaO (15%)-ZrO2 powders and the average size of the powders is about 41 nm.