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    • 2. 发明申请
    • METHOD OF MANUFACTURING THIN PLATE MAGNET HAVING MICROCRYSTALLINE STRUCTURE
    • 制造具有微结构结构的薄板磁铁的方法
    • WO98035364A1
    • 1998-08-13
    • PCT/JP1998/000330
    • 1998-01-28
    • C22C38/00H01F1/057H01F1/058
    • B82Y25/00C22C38/002H01F1/0579H01F1/058
    • A method of manufacturing an Nd-Fe-B microcrystalline permanent magnet which contains a low concentration of rare-earth elements, in which a soft magnetic phase and a hard magnetic phase are intermixed, which has, after cast, an inherent coercive force iHc of not less than 2.5 kOe and a residual flux density Br of not less than 9 kG, which has a cost-performance compared to that of a hard ferrite magnet, and which has a microcrystalline structure having a thickness of 70 mu m - 500 mu m and contributing to the size and thickness reduction of a magnetic circuit. The melt of an alloy with a specific composition is cast onto a rotating cooling roll in a low-pressure inert gas atmosphere with a pressure not higher than 30 kPa, and a microcrystalline permanent magnet alloy having a microcrystalline structure of 10 nm - 50 nm is directly manufactured from the alloy melt. By employing an alloy melt to which specific elements are added in this manufacturing process, a microcrystalline permanent magnet alloy such that the inherent coercive force iHc can be improved to be not less than 2.5 kOe, an optimum roll circumferential velocity range with which the hard magnetic characteristics can be exhibited can be widened in comparison with the range of the manufacturing conditions of Nd-Fe-B ternary magnet, and the thickness is 70 mu m - 500 mu m can be obtained.
    • 一种制造含有低浓度稀土元素的Nd-Fe-B微晶永磁体的方法,其中软磁相和硬磁相混合,其中铸造后具有固有的矫顽力iHc 不低于2.5kOe,残留磁通密度Br不低于9kG,与硬铁氧体磁体相比具有成本性能,并且具有厚度为70μm-500μm的微晶结构 并有助于磁路的尺寸和厚度减小。 具有特定组成的合金的熔体在不高于30kPa的压力的低压惰性气体气氛中流延到旋转的冷却辊上,并且具有10nm〜50nm的微晶结构的微晶永久磁铁合金为 直接由合金熔体制成。 通过在该制造方法中使用添加有特定元素的合金熔体,可以使固有矫顽力iHc可以提高到不小于2.5kOe的微晶永久磁铁合金,最佳辊圆周速度范围,硬磁体 与Nd-Fe-B三元磁体的制造条件的范围相比,能够显现出特性,可以获得70μm〜500μm的厚度。
    • 6. 发明申请
    • THIN PLATE MAGNET HAVING MICROCRYSTALLINE STRUCTURE
    • 薄板磁铁具有微结构结构
    • WO98036428A1
    • 1998-08-20
    • PCT/JP1998/000331
    • 1998-01-28
    • H01F1/057H01F1/058
    • B82Y25/00H01F1/0571H01F1/0579
    • A method of manufacturing an Nd-Fe-B microcrystalline permanent magnet which contains a low concentration of rare-earth elements, in which a soft magnetic phase and a hard magnetic phase are intermixed, which has, after cast, an inherent coercive force iHc of not less than 2.5 kOe and a residual flux density Br of not less than 9 kG, which has a cost-performance comparable to that of a hard ferrite magnet, and which has a microcrystalline structure having a thickness of 70 mu m - 500 mu m and contributing to the size and thickness reduction of a magnetic circuit. The melt of an alloy with a specific composition is cast onto a rotating cooling roll in a depressurized inert gas atmosphere with a pressure not higher than 30 kPa and a microcrystalline permanent magnet alloy having a microcrystalline structure of 15 nm - 50 nm is directly manufactured from the alloy melt. By employing an alloy melt with a specific composition to which Co, Cr, Mn, Ni, Cu, Ga, Ag, Pt, Au and Pb are added in this manufacturing process, a microcrystalline permanent magnet alloy such that the inherent coercive force iHc can be improved to be not less than 2.5 kOe, an optimum roll circumferential velocity range with which the hard magnetic characteristics can be exhibited can be widened in comparison with the range of the manufacturing conditions of Nd-Fe-B ternary magnet, and the thickness of 70 mu m - 500 mu m can be obtained.
    • 一种制造含有低浓度稀土元素的Nd-Fe-B微晶永磁体的方法,其中软磁相和硬磁相混合,其在铸造后具有固有的矫顽力iHc 不小于2.5kOe的残余通量密度Br和不低于9kG的残余通量密度Br,其具有与硬铁氧体磁体相当的性价比,并且具有厚度为70μm-500μm的微晶结构 并有助于磁路的尺寸和厚度减小。 具有特定组成的合金的熔体在压力不高于30kPa的减压惰性气体气氛中浇铸到旋转的冷却辊上,并且微晶结构为15nm-50nm的微晶永磁合金直接由 合金熔化。 通过在该制造过程中使用具有Co,Cr,Mn,Ni,Cu,Ga,Ag,Pt,Au和Pb的特定组成的合金熔体,使得固有矫顽力iHc可以 可以将其提高到不小于2.5kOe,与Nd-Fe-B三元磁体的制造条件的范围相比,能够显现出具有硬磁特性的最佳辊圆周速度范围, 70亩 - 500亩。