高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (1): 91.

• 研究论文 • 上一篇    下一篇

交流碳弧法合成碳包碳化铁纳米晶

张勋, 高江明, 刘英, 郝广明, 徐知三, 朱绫, 盛蓉生   

  1. 武汉大学测试中心, 武汉 430072
  • 收稿日期:1999-08-18 出版日期:2001-01-24 发布日期:2001-01-24
  • 通讯作者: 张勋高(1966年出生),男,副教授,从事富勒烯及纳米材料研究.
  • 基金资助:

    武汉市科学技术委员会科技攻关项目(批准号:961001005-2)资助

Preparation of Carbon-coated Iron Carbide Nanocrystals by Using AC Carbon Arc Discharge Method

ZHANG Xun-Gao, JIANG Ming, LIU Ying, HAO Guang-Ming, XU Zhi-San, ZHU Ling, SHENG Rong-Sheng   

  1. Center of Analysis and Measurement, Wuhan University, Wuhan 430072, China
  • Received:1999-08-18 Online:2001-01-24 Published:2001-01-24

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被引次数

18

摘要： 采用交流碳弧法高效合成碳包碳化铁纳米晶磁性微粉,磁性微粉产率达90%以上.用热重分析法(TG)测得磁性微粉中Fe的质量分数为17.5%.X射线衍射(XRD)分析结果表明,在碳包碳化铁微粉中存在Fe3C和Fe5C2两种结构形式,不含纯Fe晶粒,碳层结构与石墨相似.在透射电镜(TEM)下观察了纳米晶的形貌和粒径分布,碳化铁纳米晶尺寸分布在3～10nm,并呈颗粒状分散在碳层中,碳层为巴基管和巴基葱的堆积体,形状各异,尺寸分布在几十纳米到几微米之间.讨论了碳包碳化铁纳米晶的形成机理.测定了磁性微粉的磁滞回线,其饱和磁感应强度Bs,剩磁Br和矫顽力Hc分别为2.6×10-2T,2.5×10-3T和5.52kA/m.

关键词: 交流碳弧, 碳包碳化铁纳米晶, 纳米颗粒, 磁性微粉, 磁性

Abstract: Ahighly effective method for preparation of carbon-coated iron carbide nanocrystals by ACcarbon arc discharge was studied, the yield of magnetic micro powder was over 90%. The result of thermogravometric analyses(TG)(>800 ℃, O2, 5 ℃/min) indicated that there was 17.5% of Fe wrapped by graphite carbon in the magnetic micro powder. The structural characterization by X-ray diffraction(XRD) and transmission electron microscopy(TEM) revealed that Fe3C and Fe5C2 particles were wrapped by graphite carbon, no evidence of α-Fe was observed. The size of the wrapped iron carbide particles was typically in the range 3—10 nm. The formation mechanism of carbon-coated iron carbide nanocrystals was discussed. The magnetic hysteresis loop(B-H) at room temperature was investigated, it showed that Bs=2.6×10-2 T, Br=2.5×10-3 T, Br/Bs=9.7%, Hc=5.52 kA/m.

Key words: AC carbon arc discharge, Carbon-coated iron carbide nanocrystallite, Nanoparticle, Magnetic micro powder, Magnetic properties

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