| Project/Area Number |
12555178
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Osaka University |
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Principal Investigator |
MACHIDA Ken-ichi Collaborative Research Center for Advanced Science and Technology, Osaka University, 先端科学技術共同研究センター, 教授 (00157223)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Nobuo Tamakawa Seisakusyo Co., 課長(研究職)
ITOH Masahiro Collaborative Research Center for Advanced Science and Technology, Osaka University, 先端科学技術共同研究センター, 助手 (90343243)
足立 吟也 大阪大学, 大学院・工学研究科, 教授 (60029080)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥12,300,000 (Direct Cost: ¥12,300,000)
Fiscal Year 2001: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 2000: ¥7,000,000 (Direct Cost: ¥7,000,000)
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| Keywords | Permanent Magnets / Rare Earth Magnets / Bonded Magnets / Composite Magnets / Exchange Coupling / Surface Coating / Maximum Energy / Coercivity / 金属間化合物 / 侵入型金属窒化物 |
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| Research Abstract |
Rare earth permanent magnets produced from intermetallic compounds with excellent magnetic property such as Sm_2Fe_<17>N_x and Nd-Fe-B HDDR materials contribute to fabricate the portable-type high-performance OA, audio players. Particularly, these materials can be molded as bonded magnets with good accuracy for the dimension control.
From the above point of view, this work was made to prepare the good oxidation-resistant bonded magnets from the Sm_2Fe_<17>N_x and Nd-Fe-B HDDR powders by surface coating methods of zinc metal vapor sorption and/or Self Assemble Monolayer (SAM) coating (Zn/Nd-Fe-B and SAM/Sm_2Fe_<17>N_x). The resultant bonded magnets provide high (BH)max values of 166 and 183 kJ/m^3 for Zn/Nd-Fe-B and SAM/Sm_2Fe_<17>N_x, respectively. In addition, the high-performance magnetic coupling composite-type bonded magnets were prepared from the mixture of Nd-Fe-B HDDR and SAM/Sm_2Fe_<17>N_x powders. The (BH)max values observed were around 200 kJ/m^3 and the magnets were stable toward the oxidation by air or water.
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