薄板状Fe_3B/Nd_2fe_<14>B系ナノコンポジット磁石の作製

概要

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The quenching conditions for the formation of a nanocomposite microstructure in repidly-solidified Nd_4Fe_<77.5>B_<18.5> alloys were investigated in order to obtain a hard magnetic material consisting of Fe_3B and Nd_2Fe_<14>B in the asquenched state by means of the Cu single-roll melt-spinning technique. It was found for the first time that asspun Fe_3B/Nd_2Fe_<14>B hard magnets can be obtained directly from a molten alloy when the melt-spinning process is carried out under a reduced chamber pressure of 1.3 kPa Ar on a Cu-roll surface moving at a velocity of 5m/s. The as-spun Nd_4Fe_<77.5>B_<18.5> hard magnet has a thickness of 190μm and magnetic properties of J_r=1.25 T, (BH)_<max>=118.1kJ/M^3, and H_<cj>=276kA/m at room temperature. The Fe_3B/Nd_2Fe_<14>B nanocomposite hard magnets obtained by this technique may be used to produce thinplate permanent mahnets.
社団法人日本磁気学会の論文
1998-04-15