シナジー磁石と磁性材料  ソフト磁性材料の材料欠陥と強磁性粉末による修復効果

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タイトル別名
  • Geometrical Defect of Soft-Magnetic Material and Its Magnetic Restoration by Ferromagnetic Powder.
  • ソフト ジセイ ザイリョウ ノ ザイリョウ ケッカン ト キョウジセイ フンマツ ニ ヨル シュウフク コウカ

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The objective of this study is firstly to elucidate the effect of geometrical defect (artificial semi/full slit) on magnetic properties and secondly to evaluate the magnetic restoration by ferromagnetic paste filling to slit for the 4-types of soft magnetic materials. In this case, ferromagnetic pastes consist of the mixture of water-atomized powder of almost the same type (as specimen) and binding agent.<BR>The results obtained were summarized as follows:<BR>(1) DC magnetic properties are more or less degraded by semi/full slit, where magnetic induction (B) are less degraded in comparison with maximum permeability (μm), especially for high-μ permalloy.<BR>(2) AC magnetic properties, especially, specific permeability (μa) are degraded nearly in the same way as DC ones in low frequency range and less degraded at higher frequency (degradation ratio Δμa/μa<0.1, 100kHz).<BR>(3) As for DC magnetic properties, magnetic induction (B) tends to be more restored than maximum permeability (μm) by ferromagnetic paste filling to slit, although fairly plot-scattered.<BR>(4) AC magnetic properties at 60Hz also are enhanced upto restoration ratio Δμa'/Δμa-1/2 roughly by ferromagnetic paste filling to full slit, almost irrespectively of material type and slit width.<BR>(5) This ferromagnetic paste method is more effective in DC or low frequency range due to the result that Δμa/μa is fixed small for semi slit and linearly decreases for full slit with rise of applied frequency.

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