A Study on the reparation of Cobalt Oxide Powders by the Emulsion Evaporation Technique

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J. Korean Ceram. Soc. > Volume 30(5); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(5): 411.

에멀젼 증발법에 의한 산화코발트 분말의 제조에 관한 연구

손성호, 안재우, 이응조

고려대학교 금속공학과

A Study on the reparation of Cobalt Oxide Powders by the Emulsion Evaporation Technique

ABSTRACT

A process for the preparation of cobalt oxide powders was developed by the evaporaton of emulsion containing cobalt. The characteristics of powders were examined by means of DTA, X-ray diffracton, SEM, PSA. Cobalt oxide powders were produced by evaporating the emulsion prepared by mixing cobalt sulfate solution and organic phase consisted of kerosene, Span 80 and D2EHPA in the kerosene bath at 16$0^{circ}C$, then the precursor obtained was calcined at 100$0^{circ}C$. As the concentration of cobalt ions in the aqueous solution, Span 80 and the stirring speed increased, the mean size of cobalt oxide powders decreased and the size distribution was improved. At the volume ratio of one of the aqueous to organic phase, the finest mean size and the optimum size distribution was obtained. On the other hand the concentration of D2EHPA and liquid paraffin had little effect on the mean size as well as on the size distribution of powders.