Oxidation Behaver of Fe3O4 Coaded with SiO2 by Fluidized CVD

Journal of Inorganic Materials

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Oxidation Behaver of Fe₃O₄ Coaded with SiO₂ by Fluidized CVD

ZHU Yi-Hua; WU Qiu-Fang; LI Chun-Zhong

Institute of Technical Chemistry and Physics; East China University of Science and Technology; Shanghai 200237; China

Received:1999-02-02 Revised:1999-03-26 Published:2000-02-20 Online:2000-02-20

Abstract

Abstract: Fe₃O₄ magnetic powder coated with uniform SiO₂ layer was obtained by fluidized CVDtechnique. The oxidation mechanism and the kinetics of the SiO₂ coated Fe₃O₄ were investigated.The results show that the mechanism of oxidation of the SiO₂ coated Fe₃O₄is inferred as phaseboundary reaction, spherical symmetry. The activation energy is increased with increasing silicacontent. The silica protect layer on the Fe₃O₄ magnetic powder formed by fluidized CVD techniquecan improve the oxidation-resistance of Fe₃O₄.

Key words: fluidized CVD, iron oxides, magnetic powder, oxidation kinetics

CLC Number:

TM272

ZHU Yi-Hua,WU Qiu-Fang,LI Chun-Zhong. Oxidation Behaver of Fe₃O₄ Coaded with SiO₂ by Fluidized CVD[J]. Journal of Inorganic Materials.

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Oxidation Behaver of Fe₃O₄ Coaded with SiO₂ by Fluidized CVD

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