Production of Nanocrystalline Fe_<86>Zr_7B_6Cu_1 Compacts and Their Soft-Magnetic Properties
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概要
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For the production of nanocrystalline soft-magnetic compacts with high saturation magnetization, we investigated the densification behavior of amorphous and nanocrystalline Fe_<86>Zr_7B_6Cu_1 (at. %) powders using a hot-pressing machine, and the effect of coating the powder particles with SiO_2 film by a sol-gel method on the soft-magnetic properties of the compacts. The pressure required to produce Fe_<86>Zr_7B_6Cu_1 compacts with nearly full density was 3.0 GPa for the production of amorphous compacts, and 4.4 GPa for the consolidation of the nanocrystalline powder, and only 1.5 GPa for the direct consolidation of the amorphous powder into nanocrystalline compacts. The consolidation of the amorphous powder through the crystallization was the most appropriate method for the production of dense nanocrystalline compacts. The nanocrystalline Fe_<86>Zr_7B_6Cu_1 compacts of the as-prepared amorphous powder exhibited good soft-magnetic properties which were superior to those of Fe-based amorphous compacts, in addition to a high saturation magnetization B_s of 1.56 T. The coercive force H_c, effective permeability μ_e at 1 kHz and 0.8 A/m, and core loss W_h at 10 kHz and 0.1 T were 33 A/m, 1300 and 37 W/kg, respectively. The soft-magnetic properties of the nanocrystalline Fe_<86>Zr_7B_6Cu_1 compacts at higher frequency and higher B_m were improved by coating the amorphous powder particles with SiO_2 film using sol-gel method. This opens up the possibility of producing soft-magnetic nanocrystalline cores with complex shapes for high-frequency AC applications.Fe_<86>Zr_7B_6Cu_1nanocrystallineamorphousconsolidationmagnetic propertycrystallization
- 東北大学の論文
- 1996-03-28
著者
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INOUE A.
Institute for Materials Research, Tohoku University
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Masumoto T.
Institute for Materials Research, Tohoku University
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Masumoto T.
Institute For Materials Research Tohoku University
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Masumoto T.
Institute For Materials Research
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Kawamura Y.
Institute for Materials Research, Tohoku University
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Murakami Y.
Institute for Materials Research, Tohoku University
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Kojima A.
Institute for Materials Research, Tohoku University
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