1990 Fiscal Year Final Research Report Summary
Studies on Processing and Characteristics of Iron Carbides
| Project/Area Number |
01470071
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学
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| Research Institution | Nagoya University |
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Principal Investigator |
HIRANO Shin-ichi Nagoya Univ., School of Engineering, Professor, 工学部, 教授 (30016828)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Iron Carbides / Magnetic Properties / Fe_3C / Thin Film / Sputtering / Carburization |
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| Research Abstract |
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.
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