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| 机械力化学法制备MnMg铁氧体粉体的研究 |
| Study on Preparation of MnMg ferrites Powder by Mechanochemical Method |
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| DOI：10.3969/j.issn.1671-5322.2010.01.002 |
| 中文关键词: 机械力化学法 MnMg铁氧体 制备 |
| 英文关键词: mechanochemical method MnMg ferrites preparation |
| 基金项目:江苏省科技厅自然科学基金 |
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| 中文摘要: |
| 以MnO2、Fe2O3和MgO为原料,采用机械力化学法制备锰镁铁氧体粉体.研究结果表明:颗粒粒径减小主要发生在初期,随着粉磨时间的增加,细颗粒会凝聚成团聚体,破碎与凝聚过程最后达到动态平衡;高能球磨可使原料比表面积变大,无序程度增加,键能减小,从而导致内部贮能的增加,并可得到均匀混合物,能更大程度地促进化学反应.高能球磨30 h的物料,在相对较低的温度下(900℃)煅烧即可生成单相锰锌锾氧体.对于未粉磨的样品,温度必须要达到1300℃. |
| 英文摘要: |
| MnMg ferrites powder was prepared by mechanochemical method using MnO2,Fe2O3 and MgO as raw materials.The effect of grinding the mixture in a planetary ball mill on the structure of the ground product was investigated by SEM,XRD and DSC.The crystal structure of mixture is collapsed into a disordered structure,which increases with increasing grinding time.At the same time,the specific surface area increase and the bond energy reduction of the mixture were occurred.Consequently,high energy ball milling enables increase of the internal energy and improvement of the uniform mixing stage,which results in direct formation of signal phase MnMg ferrites at a relatively low temperature(900 ℃). |
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