2001 Fiscal Year Final Research Report Summary
Magnetic properties and domain patterns of amorphous powder cores produced by the cold-pressing
| Project/Area Number |
12650329
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Sojo University |
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Principal Investigator |
YAGI Masaaki Sojo University, Faculty of Engng., Prof., 工学部, 教授 (80005371)
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| Co-Investigator(Kenkyū-buntansha) |
ENDO Isao Kubota Co., Development Center., Engng. Material Dept., Manager, 開発センタ, 主幹技師
YAMASAKI Jiro Kyushu Inst. of Technology, Faculty of Engng., Prof., 工学部, 教授 (40108668)
MUNAKATA Makoto Sojo University, Faculty of Engng., Associate Prof., 工学部, 助教授 (10183112)
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| Project Period (FY) |
2000 – 2001
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| Keywords | amorphous powder / soft magnetic core / cold-pressing / cold-pressing / sintering / low core loss / choking coil |
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| Research Abstract |
Amorphous Fe-Cr-Si-B-C powder cores with glass binders were produced by cold-pressing and sintering at relatively high temperatures below crystallization temperature. The density of the core obtained was about 80%. The magnetic properties of toroidal samples 30 mm in diameter were measured. For the core pressed at 2 GPa, room temperature and sintered at 460℃×20 min in air, the initial permeability in the frequency range up to 1 MHz for Hm = 5 mOe was about 100, and the core loss at 100 kHz for Bm = 0.1 T was 500 kW/m^3. These values were comparable with those of hot-pressed amorphous powder cores, which had been previously reported. Compared with a commercial Sendust powder core widely used for choking coils and fly-back transformers, the initial permeability was approximately equal and the core loss was 30% lower. Furthermore, the domain patterns of the amorphous core were observed and their relation to the magnetic properties was discussed.
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