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Preparation of $ZrO_2$ Coated Graphite Powders in Aqueous and Nonaqueous Solution  

김정환 (경기대학교 재료공학과)
이태근 (서울산업대학교 재료공학과)
이기강 (경기대학교 재료공학과)
이석근 (포항산업기술연구원)
Publication Information
Korean Journal of Crystallography / v.14, no.2, 2003 , pp. 67-72 More about this Journal
Abstract
Graphite powders were coated with ZrO₂ by the controlled hydrolysis of a DI water, ethanol and DI water+ethanol solutions. The hydrolysis process was carried out with temperature control because of the low wettability of Zr ions to the surface of the graphite. PVA was added to the solution for the enhancement of metal ion adsorption. The surface of the graphite powders coated with ZrO₂ was observed by SEM and TEM. There are two types of ZrO₂ particles with the condition of ZrOCl₂°§8H₂O aqueous solutions were used; (a) primary particles a few nm in size and (b) secondary particles with ∼0.1 ㎛ size were obtained. The graphite powders coated in 50% ethanol-50% DI water solution of Zr(SO₄)₂ㆍ4H₂O have the relatively uniform coating layer and the starting temperature of oxidation was 100℃ higher than the raw graphite.
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