| Project/Area Number |
15360378
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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 | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
SUGIMOTO Satoshi Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10171175)
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| Co-Investigator(Kenkyū-buntansha) |
INOMATA Koichiro Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90323071)
AKEDO Jun The National Institute of Advanced Industrial Science and Technology (AIST), Group leader, 機械システム研究部門, グループ長(研究職)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2005: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2003: ¥6,600,000 (Direct Cost: ¥6,600,000)
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| Keywords | aerosol deposition method / thick film / permanent magnet / anisotropy / remanence / coercivity / deposition rate / film density / エアロゾルデポジション / 残留磁束密度 / ビッカース強度 / 微細結晶 |
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| Research Abstract |
1. Purpose
Rare earth magnets with small thickness are strongly demanded in the trend of downsizing motors and electromagnetic devices. The aerosol deposition (AD) method is one of the attractive methods for the fabrication of thick films with thickness of several μm to 500 μm. The deposition rate is around 5-50 μm/min, which 500-5000 times faster than conventional sputtering method. Therefore, in this investigation, we applied this method for the fabrication of high performance thick film magnets and investigated its possibility.
2. Results
(1) Fabrication of Sm-Fe-N AD Films and their Magnetic Properties : Since the thickness of Sm-Fe-N AD films fabricated on glass substrate was around 45 μm after deposition of 10 min, the thickness reached to 190 μm after the deposition using brass substrate. The deposition rate was estimated as 15-19 μm/min. The films showed the remanence (Br) of 0.4-0.6 T and the coercivities (μ_0H_<cJ>) increased from 1.6-1.8 T. These coercivities were higher than t
… More
hat of primary raw powders. The microvickers hardness of the AD films was around 500-700. The AD films consisted of α-Fe and Sm_2Fe_<17>N_x phases and the grain size was around 200-400 μm, which was one order smaller than that of primary powders.
(2) Fabrication of anisotropic Sm-Fe-N AD Films : It is concluded that the c-axis of Sm-Fe-N has a tendency to align along the magnetic field by using magnets or solenoid coils. Especially, applying magnetic fields of 0.19 T in plane, the remanence measured along the applied field increased with increasing the magnetic field. The maximum value of remanence was 0.54 T, which was 29% higher than that without the applied field (0.42 T).
(3) Possibility of Fe_3B/Nd_2Fe_<14>B Nanocomposite AD Films : Hysteresis loop and XRD analysis revealed that the raw powders was nanocomposite powders consisted of Fe_3B and Nd_2Fe_<14>B phase. The larger powder size of raw powders (12.45 μm) influenced the deposition rate and film thickness. The as-deposited AD film exhibited high remanence but low coercivity (H_<cJ>=0.84 kOe), though the film consisted of the Fe_3B and Nd_2Fe_<14>B phases. In addition, the coercivity further decreased by the annealing in Ar. These low coercivities were considered to be related to the relatively low anisotropy field of Nd_2Fe_<14>B phase, the defects induced during the AD method and the presence of α-Fe phase. Less
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