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1. 发明授权

US5834663A Sintered magnet and method for making 失效
标题翻译：烧结磁体及其制造方法
公开(公告)号：US5834663A
公开(公告)日：1998-11-10
申请号：US824008
申请日：1997-03-25
申请人： Akira Fukuno , Hideki Nakamura , Gouichi Nishizawa
发明人： Akira Fukuno , Hideki Nakamura , Gouichi Nishizawa
IPC分类号： B22F3/11 , H01F1/057 , C22C29/14
CPC分类号： H01F1/0577 , B22F3/1103 , B22F2998/10
摘要： In the manufacture of a rare earth sintered magnet of the Nd.sub.2 Fe.sub.14 B system, closed voids are formed in the magnet in a predetermined fraction to minimize shrinkage. Unlike open voids or pores in conventional semi-sintered magnets, the closed voids do not incur magnet corrosion since they do not communicate to the magnet exterior. By minimizing shrinkage during sintering in this way, a ring or plate-shaped thin wall anisotropic magnet can be prepared without machining for shape correction, achieving a cost reduction and a productivity improvement. Since a high density compact has a high deflective strength, it is easy to handle, minimizing cracking and chipping between the compacting and sintering steps.
摘要翻译：在制造Nd2Fe14B系稀土烧结磁体时，以预定的比例在磁体中形成封闭的空隙，以使收缩率最小化。与常规半烧结磁体中的开放空隙或孔不同，封闭的空隙不会引起磁体腐蚀，因为它们不与磁体外部连通。通过以这种方式使烧结期间的收缩最小化，可以在不进行形状校正的机械加工的情况下制备环形或板状的薄壁各向异性磁体，从而实现成本降低和生产率提高。由于高密度压块具有高的偏转强度，因此易于处理，使压实和烧结步骤之间的裂纹和碎裂最小化。

2. 发明授权

US5641363A Sintered magnet and method for making 失效
标题翻译：烧结磁体及其制造方法
公开(公告)号：US5641363A
公开(公告)日：1997-06-24
申请号：US364756
申请日：1994-12-27
申请人： Akira Fukuno , Hideki Nakamura , Gouichi Nishizawa
发明人： Akira Fukuno , Hideki Nakamura , Gouichi Nishizawa
IPC分类号： B22F3/11 , H01F1/057 , H01F1/03
CPC分类号： H01F1/0577 , B22F3/1103 , B22F2998/10
摘要： In the manufacture of a rare earth sintered magnet of the Nd.sub.2 Fe.sub.14 B system, closed voids are formed in the magnet in a predetermined fraction to minimize shrinkage. Unlike open voids or pores in conventional semi-sintered magnets, the closed voids do not incur magnet corrosion since they do not communicate to the magnet exterior. By minimizing shrinkage during sintering in this way, a ring or plate-shaped thin wall anisotropic magnet can be prepared without machining for shape correction, achieving a cost reduction and a productivity improvement. Since a high density compact has a high deflective strength, it is easy to handle, minimizing cracking and chipping between the compacting and sintering steps.
摘要翻译：在制造Nd2Fe14B系稀土烧结磁体时，以预定的比例在磁体中形成封闭的空隙，以使收缩率最小化。与常规半烧结磁体中的开放空隙或孔不同，封闭的空隙不会引起磁体腐蚀，因为它们不与磁体外部连通。通过以这种方式使烧结期间的收缩最小化，可以在不进行形状校正的机械加工的情况下制备环形或板状的薄壁各向异性磁体，从而实现成本降低和生产率提高。由于高密度压块具有高的偏转强度，因此易于处理，使压实和烧结步骤之间的裂纹和碎裂最小化。

3. 发明授权

US07192493B2 R-T-B system rare earth permanent magnet and compound for magnet 有权
标题翻译： R-T-B系稀土永磁铁和磁铁复合物
公开(公告)号：US07192493B2
公开(公告)日：2007-03-20
申请号：US10675912
申请日：2003-09-29
申请人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno
发明人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno
IPC分类号： H01F1/057
CPC分类号： H01F41/0253 , H01F1/0557 , H01F1/0577
摘要： A sintered body with a composition consisting of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, providing that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe, wherein a coefficient of variation (CV) showing the dispersion of Zr is 130 or lower. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.
摘要翻译：一种组成为25重量％至35重量％的R组成的烧结体（其中R表示一种或多种稀土元素，条件是稀土元素包括Y），0.5重量％至4.5重量％的B，0.02重量％至0.6重量％的Al和/或Cu，0.03〜0.25重量％的Zr，4重量％以下（不含0）的Co，余量实质上为Fe，其中变异系数（CV）显示Zr的分散体为130以下。该烧结体能够在保持磁特性降低至最小的同时抑制晶粒生长，并且可提高合适的烧结温度范围。

4. 发明授权

US07314531B2 R-T-B system rare earth permanent magnet 有权
标题翻译： R-T-B系稀土永磁铁
公开(公告)号：US07314531B2
公开(公告)日：2008-01-01
申请号：US10799153
申请日：2004-03-11
申请人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Yoshinori Fujikawa
发明人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Yoshinori Fujikawa
IPC分类号： H01F1/057
CPC分类号： H01F1/0577
摘要： A sintered body comprising a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co), and a grain boundary phase containing a higher amount of R than the main phase, wherein a platy or acicular product exists. This sintered body enables to inhibit the grain growth, while keeping a decrease in magnetic properties to a minimum, and to improve a suitable sintering temperature range.
摘要翻译：一种烧结体，其包含由R 2 2 T 14 B相构成的主相（其中R表示一种或多种稀土元素（使得稀土元素包括Y），T表示一种或多种基本上含有Fe或Fe和Co的过渡金属元素，以及含有比主相高的R的晶界相，其中存在片状或针状产物。该烧结体能够抑制晶粒生长，同时将磁特性降低至最小，并提高合适的烧结温度范围。

5. 发明授权

US07255752B2 Method for manufacturing R-T-B system rare earth permanent magnet 有权
标题翻译：制造R-T-B系稀土永磁体的方法
公开(公告)号：US07255752B2
公开(公告)日：2007-08-14
申请号：US10799243
申请日：2004-03-11
申请人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Nobuya Uchida
发明人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Nobuya Uchida
IPC分类号： H01F1/057
CPC分类号： H01F1/0577 , H01F41/0293
摘要： A method for manufacturing an R-T-B system rare earth permanent magnet that is a sintered body comprising a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co), and a grain boundary phase containing a higher amount of R than the above main phase, wherein a product that is rich in Zr exists in the above R2T14B phase, the above manufacturing method comprising the steps of: preparing an R-T-B alloy containing as a main component the R2T14B phase and also containing Zr, and an R-T alloy containing R and T as main components, wherein the amount of R is higher than that of the above R-T-B alloy; obtaining a mixture of the R-T-B alloy powder and the R-T alloy powder; preparing a compacted body with a certain form from the above mixture; and sintering the above compacted body, wherein, in the above sintering step, the above product is generated in the above R2T14B phase.
摘要翻译：一种用于制造RTB系稀土永磁体的方法，该稀土永磁体是包括由R 2 T 14 B相（其中R表示一个或多个）的主相的烧结体稀土元素（含有Y的稀土元素），T表示基本上含有Fe或Fe，Co的一种以上的过渡金属元素，以及比上述主相含有更多的R的晶界相，其中富含Zr的产物存在于上述R 2 T 14 B相中，上述制备方法包括以下步骤：制备含有主要的RTB合金组成R 2 T 14 T B相并且还含有Zr，以及含有R和T作为主要成分的RT合金，其中R的量高于以上RTB合金; 得到R-T-B合金粉末和R-T合金粉末的混合物; 从上述混合物制备具有某种形式的压实体; 并烧结上述压实体，其中在上述烧结步骤中，在上述R 2 T 14 B相中产生上述产物。

6. 发明授权

US07255751B2 Method for manufacturing R-T-B system rare earth permanent magnet 有权
标题翻译：制造R-T-B系稀土永磁体的方法
公开(公告)号：US07255751B2
公开(公告)日：2007-08-14
申请号：US10675797
申请日：2003-09-29
申请人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno
发明人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno
IPC分类号： H01F1/057
CPC分类号： H01F41/0253 , H01F1/0557 , H01F1/0577
摘要： When an R-T-B system rare earth permanent magnet is obtained by a mixing method to obtain a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, providing that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe, wherein a coefficient of variation (CV) showing the dispersion of Zr is 130 or lower, Zr is contained in a low R alloy. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.
摘要翻译：当通过混合方法获得具有组成基本上由25％至35％的R组成的烧结体获得RTB系稀土永磁体时（其中R表示一种或多种稀土元素，条件是稀土元素元素包括Y），0.5〜4.5重量％的B，0.02〜0.6重量％的Al和/或Cu，0.03〜0.25重量％的Zr，4重量％以下（不含0） Co，余量基本上为Fe，其中显示Zr分散的变异系数（CV）为130以下，Zr含有低R合金。该烧结体能够在保持磁特性降低至最小的同时抑制晶粒生长，并且可提高合适的烧结温度范围。

7. 发明授权

US07311788B2 R-T-B system rare earth permanent magnet 有权
标题翻译： R-T-B系稀土永磁铁
公开(公告)号：US07311788B2
公开(公告)日：2007-12-25
申请号：US10675230
申请日：2003-09-29
申请人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno , Yoshinori Fujikawa
发明人： Gouichi Nishizawa , Chikara Ishizaka , Tetsuya Hidaka , Akira Fukuno , Yoshinori Fujikawa
IPC分类号： H01F1/057
CPC分类号： C22C28/00 , C22C1/0441 , C22C30/00 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/0557 , H01F1/0577 , H01F41/0253
摘要： A sintered body with a composition consisting of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, provided that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe. This sintered body has a coefficient of variation (CV value) showing the dispersion degree of Zr of 130 or less. In addition, this sintered body has a grain boundary phase comprising a region that is rich both in at least one element selected from a group consisting of Cu, Co and R, and in Zr. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.
摘要翻译：具有25重量％至35重量％的R（其中R表示一种或多种稀土元素，条件是稀土元素包括Y），0.5重量％至4.5重量％的B组成的烧结体，0.02重量％至0.6重量％的Al和/或Cu，0.03〜0.25重量％的Zr，4重量％以下（不包括0）的Co，余量实质上为Fe。该烧结体具有显示Zr的分散度为130以下的变异系数（CV值）。此外，该烧结体具有包含富含选自Cu，Co和R中的至少一种元素的区域和在Zr中的区域的晶界相。该烧结体能够在保持磁特性降低至最小的同时抑制晶粒生长，并且可提高合适的烧结温度范围。

8. 发明授权

US06811620B2 R-T-B system rare earth permanent magnet 有权
标题翻译： R-T-B系稀土永磁铁
公开(公告)号：US06811620B2
公开(公告)日：2004-11-02
申请号：US10799203
申请日：2004-03-11
申请人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Nobuya Uchida
发明人： Chikara Ishizaka , Gouichi Nishizawa , Tetsuya Hidaka , Akira Fukuno , Nobuya Uchida
IPC分类号： H01F1053
CPC分类号： H01F1/0577 , H01F41/0293
摘要： An R—T—B system rare earth permanent magnet, which is a sintered body comprising: a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co); and a grain boundary phase containing a higher amount of R than the above main phase, wherein a product that is rich in Zr exists in the above R2T14B phase. The product that is rich in Zr has a platy or acicular form. The R—T—B system rare earth permanent magnet containing the product enables to inhibit the grain growth, while keeping a decrease in magnetic properties to a minimum, and to obtain a wide suitable sintering temperature range.
摘要翻译：一种RTB系稀土永磁体，其为烧结体，包括：由R2T14B相（其中R表示一种或多种稀土元素（提供稀土元素包括Y））组成的主相，T表示一种或多种过渡金属元素基本上含有Fe或Fe和Co）; 以及含有比上述主相含量更高的R的晶界相，其中在上述R2T14B相中存在富含Zr的产物。富含Zr的产品具有扁平或针状。含有该产品的R-T-B系稀土永磁体能够抑制晶粒生长，同时将磁性降低至最小，并获得宽的合适的烧结温度范围。

9. 发明授权

US5209789A Permanent magnet material and method for making 失效
标题翻译：永磁材料及其制造方法
公开(公告)号：US5209789A
公开(公告)日：1993-05-11
申请号：US755188
申请日：1991-09-05
申请人： Tetsuhito Yoneyama , Hideki Nakamura , Akira Fukuno
发明人： Tetsuhito Yoneyama , Hideki Nakamura , Akira Fukuno
IPC分类号： B22D11/06 , C22C33/04 , H01F1/053 , H01F1/057
CPC分类号： H01F1/0571 , B22D11/0697 , Y10S428/928 , Y10T428/12465
摘要： A melt of Nd-Fe-B alloy is injected in an inert gas atmosphere through a nozzle against a chill roll or a pair of chill rolls rotating relative to the nozzle for contacting the melt with the circumference of the chill roll or rolls, thereby quenching the melt. The chill roll has a low heat conductivity surface layer around a base or has a predetermined surface roughness on its circumference. The contact time of the melt with the chill roll can be increased by blowing an inert gas flow. Further the melt is quenched in an inert gas atmosphere of up to 1 Torr. A wind shield is disposed in proximity to the chill roll circumference for preventing a wind of the ambient gas induced by rotation of the chill roll from reaching a paddle of the melt. With these means, there is obtained a permanent magnet material having a grain diameter with a reduced variation.
摘要翻译： Nd-Fe-B合金的熔体通过喷嘴在惰性气体气氛中通过冷却辊或相对于喷嘴旋转的一对冷却辊注入，用于使熔体与冷却辊或辊的周边接触，从而淬火熔化。冷却辊在基部周围具有低导热性表面层或在其圆周上具有预定的表面粗糙度。可以通过吹入惰性气流来增加熔体与冷却辊的接触时间。此外，熔体在高达1托的惰性气体气氛中淬火。挡风玻璃设置在冷却辊周边附近，用于防止由冷却辊的旋转引起的环境气体的风到达熔体的桨叶。通过这些方法，获得具有减小的变化的粒径的永久磁铁材料。

10. 发明授权

US5665177A Method for preparing permanent magnet material, chill roll, permanent magnet material, and permanent magnet material powder 失效
标题翻译：制备永磁材料，冷却辊，永磁材料和永磁材料粉末的方法
公开(公告)号：US5665177A
公开(公告)日：1997-09-09
申请号：US878523
申请日：1992-05-05
申请人： Akira Fukuno , Hideki Nakamura , Tetsuhito Yoneyama
发明人： Akira Fukuno , Hideki Nakamura , Tetsuhito Yoneyama
IPC分类号： B22D11/06 , B22F1/00 , B22F3/00 , H01F1/053 , H01F1/057 , H01F41/02 , H01F1/032
CPC分类号： B22D11/0611 , H01F1/0571 , Y10S428/90 , Y10T428/2457 , Y10T428/31
摘要： A permanent magnet material is prepared by cooling with a chill roll a molten alloy containing R wherein R is at least one rare earth element inclusive of Y, Fe or Fe and Co, and B. The chill roll has a plurality of circumferentially extending grooves in a circumferential surface, the distance between two adjacent ones of the grooves at least in a region with which the molten alloy comes in contact being 100 to 300 .mu.m average in an arbitrary cross section containing a roll axis. Permanent magnet material of stable performance is obtained since the variation of cooling rate caused by a change in the circumferential speed of the chill roll is small. The variation of cooling rate is small even when it is desired to change the thickness of the magnet by altering the circumferential speed. The equalized groove pitch results in a minimized variation in crystal grain diameter.
摘要翻译：通过用冷却辊冷却含有R的熔融合金来制备永久磁铁材料，其中R是至少一种包括Y，Fe或Fe和Co以及B的稀土元素。冷却辊具有多个周向延伸的凹槽至少在熔融合金接触的区域中，两个相邻的槽之间的距离在包含辊轴的任意横截面中平均为100〜300μm。由于冷却辊的圆周速度的变化引起的冷却速度的变化小，所以获得了稳定性能的永久磁铁材料。即使希望通过改变圆周速度来改变磁体的厚度，冷却速度的变化也很小。均匀的沟槽间距导致晶粒直径的最小化。

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