-
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
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。
-
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
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。
-
公开(公告)号：US5209789A
公开(公告)日：1993-05-11
申请号：US755188
申请日：1991-09-05
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。
-
公开(公告)号：US5750044A
公开(公告)日：1998-05-12
申请号：US500578
申请日：1995-07-11
CPC分类号： H01F1/0596
摘要： A magnet consists essentially of 4-8 at % of R, 10-20 at % of N, 2-10 at % of M, and the balance of T wherein R is at least one rare earth element, Sm being present in R in a proportion of at least 50 at %, T is Fe or Fe and Co, M is Zr with or without partial replacement by at least one element of Ti, V, Cr, Nb, Hf, Ta, Mo, W, Al, C, and P. Contained in the magnet are a hard magnetic phase based on R, T, and N and containing at least one crystalline phase selected from TbCu.sub.7, Th.sub.2 Zn.sub.17, and Th.sub.2 Ni.sub.17 types and a soft magnetic phase consisting of a T phase having a bcc structure, the soft magnetic phase having a mean grain size of 5-60 nm and being present in a proportion of 10-60% by volume. This construction ensures high coercivity, high squareness ratio, and high maximum energy product.
摘要翻译： 磁体基本上由R的4-8原子％组成，N为10-20原子％，M为2-10原子％，余量为T，其中R为至少一种稀土元素，Sm存在于R中 至少50原子％的比例，T是Fe或Fe和Co，M是具有或不被Ti，V，Cr，Nb，Hf，Ta，Mo，W，Al，C的至少一种元素部分置换的Zr的Zr 和P.包含在磁体中的是基于R，T和N的硬磁相，并且含有至少一种选自TbCu7，Th2Zn17和Th2Ni17类型的结晶相和由具有bcc的T相组成的软磁相 结构，软磁性相的平均粒径为5-60nm，以10〜60体积％的比例存在。 这种结构确保了高矫顽力，高矩形比和高最大能量产品。
-
15.发明授权
公开(公告)号：US5993939A
公开(公告)日：1999-11-30
申请号：US835814
申请日：1997-04-16
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 on 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，在包含辊轴的任意横截面中，平均两个相邻槽之间的距离为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。
-
公开(公告)号：US5916376A
公开(公告)日：1999-06-29
申请号：US984945
申请日：1997-12-04
CPC分类号： H01F1/059
摘要： An object of the invention is to provide an inexpensive magnet having a high coercivity, high squareness ratio and high maximum energy product. According to the invention, a magnet containing R, T, N, and M wherein R is at least one rare earth element with essential samarium, T is iron or iron and cobalt, and M is at least one element of Ti, V, Cr, Nb, Hf, Ta, Mo, W, Al, C, and P, with essential zirconium, in amounts of 4-8 at % of R, 10-20 at % of N, 2-10 at % of M, and having a hard magnetic phase (TbCu.sub.7 type crystalline phase) and a soft magnetic phase (which is a bcc structured T phase, has an average grain diameter of 5-60 nm, and accounts for 10 to 60% by volume of the entirety), the atomic ratio (R+M)/(R+T+M) in the hard magnetic phase being in excess of 12.5%, is prepared utilizing a single roll technique. In the single roll technique, the peripheral speed of a chill roll is at least 50 m/s, and the discharge pressure of the molten alloy is 0.3-2 kgf/cm.sup.2. Following quenching, the quenched alloy is subjected to heat treatment at 600-800.degree. C. and then to nitriding treatment.
摘要翻译： 本发明的目的是提供一种具有高矫顽力，高矩形比和高最大能量积的廉价磁铁。 根据本发明，含有R，T，N和M的磁体，其中R是至少一种具有必需钐的稀土元素，T是铁或铁和钴，M是Ti，V，Cr中的至少一种元素 ，Nb，Hf，Ta，Mo，W，Al，C和P与必需的锆，其量为R的4-8原子％，N为10-20at％，M为2-10at％，以及 具有硬磁相（TbCu7型结晶相）和软磁相（其为bcc结构的T相，平均粒径为5-60nm，占全体的10〜60体积％）， 使用单辊技术制备硬磁相中的原子比（R + M）/（R + T + M）超过12.5％。 在单辊技术中，冷却辊的圆周速度为至少50m / s，熔融合金的排出压力为0.3-2kgf / cm 2。 淬火后淬火合金在600-800℃进行热处理，然后进行氮化处理。
-
公开(公告)号：US5309977A
公开(公告)日：1994-05-10
申请号：US9948
申请日：1993-01-27
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。
-
-
-
-
-
-
搜索结果
17 条记录 (耗时 0.027 秒)
