Studies on Processing and Characteristics of Iron Carbides

碳化铁的加工及特性研究

• 批准号: 01470071
• 负责人: HIRANO Shin-ichi
• 金额: $ 4.42万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470071/
• 关键词: Iron Carbides; Magnetic Properties; Fe_3C; Thin Film; Sputtering; Carburization; 高飽和磁化値; 保磁力

In this research, the processing and the characteristics of iron carbides particles and films were investigated in detail in order to elucidate the basic properties for their application to a magnetic recording material.CO gas diluted with N_2 was found to be a very effective reactive gas for carburization of iron oxides or alpha-Fe to produce the well-defined iron carbides. Fe_5C_2 formed as a major phase at temperatures from 300 to 400^ﾟC. Fe_3C could be synthesized above 400^ﾟC as a single phase. The addition of alkali or alkaline earth to iron oxide particles was found to be a key to synthesize Fe_7C_3 particles.The improvement of the coercivity and the squareness of the magnetic characteristics could be achieved by the processing of acicular Fe_3C particles, which were synthesized from acicular alpha-Fe particles with CO gas. Their saturation magnetization, the coercivity and the squareness were 100 emu/g, 700 Oe and 0.4, respectively.Fe_3C thin films could successfully be synthesized by the controlled RF-magnetron sputtering with a composite target of Fe/C. The optimum condition to synthesize the single phase Fe_3C films found to be as follows ; temperature, 350^ﾟC, Ar pressure, 5 Pa.The saturation magnetization and the coercivity of the Fe_3C films were from 100 to 120 emu/g and 250 Oe, respectively, The films exhibits a longitudinal magnetization direction.

在这项研究中，详细研究了碳化铁颗粒和薄膜的加工和特性，以阐明其在磁记录材料中的应用的基本性能。用N_2稀释的CO气体被发现是一种非常有效的反应气体氧化铁或 α-Fe 的渗碳可在 300 至 400^ﾟC 的温度下生成明确的碳化铁 Fe_5C_2。发现在400^ﾟC以上作为单相添加碱金属或碱土金属是合成Fe_7C_3颗粒的关键。通过处理可以实现矫顽力和磁特性的方形度的改善。由针状α-Fe颗粒与CO气体合成的针状Fe_3C颗粒，其饱和磁化强度、矫顽力和方形度均为100。 emu/g、700 Oe和0.4。采用Fe/C复合靶材进行可控射频磁控溅射可以成功合成Fe_3C薄膜。合成单相Fe_3C薄膜的最佳条件如下：温度, 350^ﾟC, Ar压力, 5 Pa。Fe_3C薄膜的饱和磁化强度和矫顽力为100~120 emu/g和250 Oe，薄膜呈现纵向磁化方向。

项目成果

S.Tajima: "Synthesis and Magnetic Properties of Fe_7C_3 particles with High saturation magnetization" Japanese Journal of Applied Physics. 29. 662-668 (1990)

S.Tajima：“高饱和磁化强度Fe_7C_3颗粒的合成和磁性”日本应用物理学杂志。

S.HIRANO: "Synthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon mono oxide" Journal of Materials Science. 25. 4457-4461 (1990)

S.HIRANO：“氧化铁和一氧化碳反应合成 Fe_5C_2 及其磁性”材料科学杂志。

S. Tajima and S. Hirano,: "Synthesis and magnetic properties of Fe_7C_3 particles with high saturation magnetization" Jpn. J. Appl. Phys.,. 29-4. 662-668, (1990)

S. Tajima 和 S. Hirano，“高饱和磁化强度 Fe_7C_3 颗粒的合成及其磁性能”Jpn。

田島 伸: "各種出発鉄原料と一酸化炭素からの針状炭化鉄の生成挙動およびその磁気的特性" 粉体および粉末冶金協会誌. (1991)

Shin Tajima：“各种起始铁材料和一氧化碳的针状碳化铁的形成行为及其磁性”粉末和粉末冶金学会杂志（1991）。

S. Hirano and S. Tajima,: "Synthesis and magnetic properties of Fe_5C_2 by reaction of iron oxide and carbon monoxide" J. Mater. Sci.25-10,. 4457-4461, (1990)

S. Hirano 和 S. Tajima，：“氧化铁和一氧化碳反应合成 Fe_5C_2 及其磁性” J. Mater。