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.

本研究以N_2稀释的CO气体为反应气体，对氧化铁或α-Fe进行碳化，制备出结构清晰的碳化铁颗粒和薄膜，并对其基本性能进行了研究。Fe_5C_2在300 ~ 400 ℃时形成主相。在400 ℃以上可以合成单相Fe_3C。碱金属或碱土金属的加入是合成Fe_7C_3颗粒的关键，通过对针状α-Fe颗粒与CO气体反应合成的针状Fe_3C颗粒进行处理，可以改善其磁性和矩形度。采用磁控溅射法，在Fe/C复合靶上成功地制备了Fe 3C薄膜。在350 ℃、Ar气压为5 Pa的条件下合成了单相Fe_3C薄膜，其饱和磁化强度为100 ~ 120 emu/g，矫顽力为250 Oe，具有纵向磁化方向。

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. 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。

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. 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。

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）。