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    R-Fe-B MICROCRYSTALLINE HIGH-DENSITY MAGNET AND PROCESS FOR PRODUCTION THEREOF
    4.
    发明公开
    R-Fe-B MICROCRYSTALLINE HIGH-DENSITY MAGNET AND PROCESS FOR PRODUCTION THEREOF 有权
    R-FE-B-MIKROKRISTALLINER MAGNET VON HOHER DICHTE UND HERSTELLUNGSVERFAHRENDAFÜR

    公开(公告)号：EP2043114A1

    公开(公告)日：2009-04-01

    申请号：EP07831943.1

    申请日：2007-11-15

    申请人： Hitachi Metals, Ltd.

    发明人： NOZAWA, Noriyuki ,  NISHIUCHI, Takeshi ,  HIROSAWA, Satoshi ,  MAKI, Tomohito

    IPC分类号： H01F41/02 ,  B22F1/00 ,  B22F3/00 ,  B22F3/24 ,  B22F3/26 ,  B22F9/04 ,  C22C38/00 ,  H01F1/053 ,  H01F1/08

    CPC分类号： H01F41/0273 ,  B22F3/11 ,  B22F2003/248 ,  B22F2998/10 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0577 ,  H01F1/0578 ,  H01F41/0293 ,  B22F3/02 ,  B22F3/24

    摘要： According to the present invention, an R-Fe-B based rare-earth alloy powder with a mean particle size of less than 20 µm is provided and compacted to make a powder compact. Next, the powder compact is subjected to a heat treatment at a temperature of 550 °C to less than 1,000 °C within hydrogen gas, thereby producing hydrogenation and disproportionation reactions (HD processes). Then, the powder compact is subjected to another heat treatment at a temperature of 550 °C to less than 1,000 °C within either a vacuum or an inert atmosphere, thereby producing desorption and recombination reactions and obtaining a porous material including fine crystal grains, of which the density is 60% to 90% of their true density and which have an average crystal grain size of 0.01 µm to 2 µm (DR processes). Thereafter, the porous material is subjected to yet another heat treatment at a temperature of 750 °C to less than 1,000 °C within either the vacuum or the inert atmosphere, thereby further increasing its density to 93% or more of their true density and making an R-Fe-B based microcrystalline high-density magnet.

    摘要翻译： 根据本发明，提供平均粒径小于20μm的R-Fe-B类稀土合金粉末并压实成粉末成形体。 接着，在氢气中，在550℃〜1000℃的温度下对粉体进行热处理，从而进行氢化和歧化反应（HD工序）。 然后，在真空或惰性气氛中，在550〜1000℃的温度下进行另一次热处理，由此进行解吸和复合反应，得到包含微细晶粒的多孔材料 其密度为其真密度的60％至90％，并且其平均晶粒尺寸为0.01μm至2μm（DR工艺）。 此后，在真空或惰性气氛中，在750℃至小于1000℃的温度下对多孔材料进行另外的热处理，从而进一步将其密度增加至其真实密度的93％以上 一种R-Fe-B系微晶高密度磁体。

    RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME
    5.
    发明公开
    RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME 审中-公开
    GESINTERTES SELTENERDENMAGNET UND HERSTELLUNGSVERFAHRENDAFÜR

    公开(公告)号：EP1961506A1

    公开(公告)日：2008-08-27

    申请号：EP06833815.1

    申请日：2006-11-30

    申请人： HITACHI METALS, LTD.

    发明人： NOZAWA, Noriyuki ,  ODAKA, Tomoori ,  MATSUURA, Yutaka

    IPC分类号： B22D11/06 ,  B22F3/00 ,  B22F3/02 ,  C22C33/02 ,  C22C38/00 ,  H01F1/053 ,  H01F1/08 ,  H01F41/02

    CPC分类号： B22D11/0611 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/0278 ,  C22C38/005 ,  H01F1/0577 ,  H01F41/0273 ,  H01F41/0293 ,  B22F9/04 ,  B22F3/02 ,  B22F3/10 ,  B22F2202/05

    摘要： A sintered rare-earth magnet according to the present invention includes an Nd 2 Fe 14 B type crystalline phase as its main phase and Al as an additive. The magnet includes at least one light rare-earth element LR selected from the group consisting of yttrium and the rare-earth elements other than Dy, Ho and Tb, and at least one heavy rare-earth element HR selected from the group consisting of Dy, Ho and Tb. The mole fractions α 1, α 2 and β of the light and heavy rare-earth elements LR and HR and Al satisfy the inequalities 25≦ α 1+ α 2 ≦40 mass%, 0 α 2≦40 mass%, β >0.20 mass%, and 0.04 ≦ β / α 2≦ 0.12.

    摘要翻译： 根据本发明的烧结稀土类磁铁，以Nd 2 Fe 14 B型结晶相为主相，Al为添加剂。 所述磁体包括选自由钇和除Dy，Ho和Tb以外的稀土元素组成的组中的至少一种轻稀土元素LR，以及选自由Dy组成的组中的至少一种重稀土类元素 ，Ho和Tb。 轻重稀土元素LR和HR和Al的摩尔分数±1，±2和²满足不等式25‰|±1 +±2‰| 40质量％，0 <±2‰|40质量％ ，0.20质量％，0.04‰|²/±2‰| 0.12。