| Project/Area Number |
61850053
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Miyagi National College of Technology |
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Principal Investigator |
YAGI Masaaki Miyagi National College of Technology, 電気工学科, 教授 (80005371)
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| Co-Investigator(Kenkyū-buntansha) |
森本 耕一郎 三菱金属中央研究所, 研究員
IKUTA Nobuyuki Miyagi National College of Technology, 材料工学科, 助教授 (50042255)
TANNO Koichi Miyagi National College of Technology, 材料工学科, 教授 (50042247)
MORIMOTO Koichiro Mitsubishi Metal Research Institute
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1987: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1986: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Magnetic alloy powder / New counterrotating method / 超急冷磁性合金微粉末 / アトマイズ粉末の製造 / 加熱冷却二系統回転法 |
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| Research Abstract |
Rapidly solidified Fe based magnetic ally powders were fabricated by a new counterrotating method and the powder properties were investigated. This new atomizing method was develpod by the authors in this work. The atomizing apparatus consisits of a inverse T shaped quartz nozzle for ejecting molten alloys and a wine-cup shaped cooling disk with a diameter of 240mm. Both the nozzle and the cooling disk were rotated in opposite direction about a vertical coaxial. The maximum revolving speed of the nozzle and the disk was 10000 rpm.The molten alloy ejected by centrifugal force was atomized and solidified rapidly on the surface of the cooling disk. The alloys were melted and quenched in Ar gas atomospere in order to avoid oxidation. The compositions of alloys were Fe_<82>B_<18> and Nd_2Fe_<14>B.
The powders obtained had good sphericity and smoothness. Less than 80% of the cumulative size distribution by weight, the particle size was about 10 m to 200 m and the average diameter of powders was about 100 m. The cooling rate was about 10^4゜C/s to 10^7゜C/s. Microscopic examination made on the cross section of powders. The grain size decreased with decrease of the particle diameter. Small particles of FeD less than about 44 m was almost non-crystalline in structure. In the case of NdFeD powders, the grain size was about microns to submicrons.
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