| 流态化CVD包硅的Fe3O4的氧化行为 |
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| 引用本文： | 朱以华,吴秋芳,李春忠. 流态化CVD包硅的Fe3O4的氧化行为[J]. 无机材料学报, 2000, 15(1): 26 |
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| 作者姓名： | 朱以华 吴秋芳 李春忠 |
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| 作者单位： | 华东理工大学技术化学物理研究所, 上海 200237 |
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| 基金项目： | 国家自然科学基金!29506045 |
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| 摘 要： | 采用流态化ＣＶＤ包硅技术制得了表面均匀包覆ＳｉＯ2的Ｆｅ３Ｏ４磁粉．对该包硅Ｆｅ３Ｏ４磁粉的氧化机理和动力学进行了研究．结果表明，氧化反应机理符合三维球对称扩散模型，氧化反应活化能随包硅量的增加而增加，流态化ＣＶＤ包硅能提高Ｆｅ３Ｏ４磁粉的抗氧化作用在于粒子表面形成了均匀的ＳｉO2保护层．
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| 关 键 词： | 流态化包覆 氧化铁 磁粉 氧化动力学 |
| 收稿时间： | 1999-02-02 |
| 修稿时间： | 1999-03-26 |
Oxidation Behaver of Fe3O4 Coaded with SiO2 by Fluidized CVD |
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| ZHU Yi-Hua,WU Qiu-Fang,LI Chun-Zhong. Oxidation Behaver of Fe3O4 Coaded with SiO2 by Fluidized CVD[J]. Journal of Inorganic Materials, 2000, 15(1): 26 |
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| Authors: | ZHU Yi-Hua WU Qiu-Fang LI Chun-Zhong |
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| Affiliation: | Institute of Technical Chemistry and Physics; East China University of Science and Technology; Shanghai 200237; China |
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| Abstract: | Fe_3O_4 magnetic powder coated with uniform SiO_2 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 Fe3O4 is 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. |
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| Keywords: | fluidized CVD iron oxides magnetic powder oxidation kinetics |
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