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    R-Fe-B microcrystalline high-density magnet and process for production thereof
    3.
    发明授权
    R-Fe-B microcrystalline high-density magnet and process for production thereof 有权
    R-Fe-B微晶高密度磁铁及其制造方法

    公开(公告)号：US08128758B2

    公开(公告)日：2012-03-06

    申请号：US12254967

    申请日：2008-10-21

    申请人： Noriyuki Nozawa ,  Takeshi Nishiuchi ,  Satoshi Hirosawa ,  Tomohito Maki

    发明人： Noriyuki Nozawa ,  Takeshi Nishiuchi ,  Satoshi Hirosawa ,  Tomohito Maki

    IPC分类号： H01F1/057

    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： An R—Fe—B based rare-earth alloy powder with a mean particle size of less than about 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 about 550° C. to less than about 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 about 550° C. to less than about 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 about 60% to about 90% of their true density and which have an average crystal grain size of about 0.01 μm to about 2 μm (DR processes). Thereafter, the porous material is subjected to yet another heat treatment at a temperature of about 750° C. to less than about 1,000° C. within either the vacuum or the inert atmosphere, thereby further increasing its density to about 93% or more of their true density and making an R—Fe—B based microcrystalline high-density magnet.

    摘要翻译： 提供平均粒度小于约20μm的R-Fe-B基稀土合金粉末并压实成粉末压块。 接着，在氢气中，在约550℃至小于约1000℃的温度下对粉体进行热处理，由此进行氢化和歧化反应（HD工艺）。 然后，在真空或惰性气氛中，将粉末压块在约550℃至小于约1000℃的温度下进行另外的热处理，从而产生解吸和重组反应，并获得包括精细的多孔材料 晶粒，其密度为其真密度的约60％至约90％，并且其平均晶粒尺寸为约0.01μm至约2μm（DR工艺）。 此后，多孔材料在真空或惰性气氛中在约750℃至小于约1000℃的温度下进行另外的热处理，从而进一步将其密度提高到约93％以上 它们的真实密度并制成R-Fe-B基微晶高密度磁体。

    METHOD FOR PRODUCING RARE EARTH PERMANENT MAGNETS, AND RARE EARTH PERMANENT MAGNETS
    5.
    发明申请
    METHOD FOR PRODUCING RARE EARTH PERMANENT MAGNETS, AND RARE EARTH PERMANENT MAGNETS 审中-公开
    生产稀土永磁体的方法和稀土永磁体

    公开(公告)号：US20130068992A1

    公开(公告)日：2013-03-21

    申请号：US13698748

    申请日：2011-05-19

    申请人： Kazuhiro Hono ,  Tadakatsu Ohkubo ,  Hossein Sepehri Amin ,  Noriyuki Nozawa ,  Takeshi Nishiuchi ,  Satoshi Hirosawa

    发明人： Kazuhiro Hono ,  Tadakatsu Ohkubo ,  Hossein Sepehri Amin ,  Noriyuki Nozawa ,  Takeshi Nishiuchi ,  Satoshi Hirosawa

    IPC分类号： H01F1/01

    CPC分类号： C22C33/0278 ,  B22F2998/10 ,  C21D6/00 ,  C22C38/005 ,  H01F1/0573 ,  H01F41/0266 ,  H01F41/0293 ,  B22F3/02 ,  B22F3/1017 ,  B22F3/14

    摘要： An R-T-B based permanent magnet powder, which has been made by an HDDR process and which has an average crystal grain size of 0.1 μm to 1 μm and a crystal grain aspect ratio (ratio of the major axis size to the minor axis size) of 2 or less, is provided (Step (A)). R is a rare-earth element, of which at least 95 at % is Nd and/or Pr, and T is either Fe alone or Fe partially replaced with Co and/or Ni and is a transition metal element, of which at least 50 at % is Fe. Meanwhile, an R′—Cu based alloy powder, which is made up of R′ and Cu, which accounts for 2 at % to 50 at % of the alloy powder, is also provided (Step (B)). R′ is a rare-earth element, of which at least 90 at % is Nd and/or Pr but which includes neither Dy nor Tb. The R-T-B based permanent magnet powder and the R′—Cu based alloy powder are mixed together to obtain a mixed powder (Step (C)). And then the mixed powder is subjected to a heat treatment process at a temperature of 500° C. to 900° C. in either an inert ambient gas or a vacuum (Step (D)).

    摘要翻译： 通过HDDR法制造的平均晶粒尺寸为0.1μm〜1μm，晶粒长宽比（长轴尺寸与短轴尺寸的比）为2的RTB型永久磁铁粉末 （步骤（A））。 R是稀土元素，其中至少95原子％是Nd和/或Pr，T是单独的Fe或Fe部分被Co和/或Ni代替，并且是过渡金属元素，其中至少50 at％是Fe。 同时，还提供由R'和Cu组成的R'-Cu基合金粉末，其占合金粉末的2at％至50at％（步骤（B））。 R'是稀土元素，其中至少90原子％是Nd和/或Pr，但不包括Dy和Tb。 将R-T-B系永久磁铁粉末和R'-Cu系合金粉末混合，得到混合粉末（工序（C））。 然后将混合粉末在惰性环境气体或真空中在500℃至900℃的温度下进行热处理（步骤（D））。

    Rare earth sintered magnet and method for producing same
    6.
    发明授权
    Rare earth sintered magnet and method for producing same 有权
    稀土烧结磁体及其制造方法

    公开(公告)号：US08182618B2

    公开(公告)日：2012-05-22

    申请号：US12095617

    申请日：2006-11-30

    申请人： Noriyuki Nozawa ,  Tomoori Odaka ,  Yutaka Matsuura

    发明人： Noriyuki Nozawa ,  Tomoori Odaka ,  Yutaka Matsuura

    IPC分类号： H01F1/057

    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 includes an Nd2Fe14B 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 α1, α2 and β of the light and heavy rare-earth elements LR and HR and Al satisfy the inequalities 25≦α1+α2≦40 mass %, 0 0.20 mass %, and 0.04≦β/α2≦0.12.

    摘要翻译： 烧结稀土类磁体包括Nd2Fe14B型结晶相作为主相，Al为添加剂。 所述磁体包括选自钇和除Dy，Ho和Tb以外的稀土元素的至少一种轻稀土元素LR，以及选自Dy中的至少一种重稀土类元素 ，Ho和Tb。 摩尔分数α1，α2和＆bgr; 轻质和重稀土元素LR和HR和Al满足不等式25＆nlE;α1+α2＆nlE; 40质量％，0 <α2＆nlE; 40质量％，＆gt; 0.20质量％和0.04＆nlE;＆bgr; /α2＆ ; 0.12。

    RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME
    7.
    发明申请
    RARE EARTH SINTERED MAGNET AND METHOD FOR PRODUCING SAME 有权
    稀土烧结磁体及其制造方法

    公开(公告)号：US20100148897A1

    公开(公告)日：2010-06-17

    申请号：US12095617

    申请日：2006-11-30

    申请人： Noriyuki Nozawa ,  Tomoori Odaka ,  Yutaka Matsuura

    发明人： Noriyuki Nozawa ,  Tomoori Odaka ,  Yutaka Matsuura

    IPC分类号： H01F7/02 ,  B22F1/00 ,  B22F3/12

    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 includes an Nd2Fe14B 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 α1, α2 and β of the light and heavy rare-earth elements LR and HR and Al satisfy the inequalities 25≦α1+α2≦40 mass %, 0 0.20 mass %, and 0.04≦β/α2≦0.12.

    摘要翻译： 烧结稀土类磁体包括Nd2Fe14B型结晶相作为主相，Al为添加剂。 所述磁体包括选自钇和除Dy，Ho和Tb以外的稀土元素的至少一种轻稀土元素LR，以及选自Dy中的至少一种重稀土类元素 ，Ho和Tb。 摩尔分数α1，α2和＆bgr; 轻质和重稀土元素LR和HR和Al满足不等式25＆nlE;α1+α2＆nlE; 40质量％，0 <α2＆nlE; 40质量％，＆gt; 0.20质量％和0.04＆nlE;＆bgr; /α2＆ ; 0.12。