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31. 发明专利

JPH03277733A MANUFACTURE OF RAW MATERIAL FOR RARE EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH03277733A
公开(公告)日：1991-12-09
申请号：JP7775690
申请日：1990-03-27
申请人： HITACHI METALS LTD
发明人： UCHIDA KIMIO , USHIJIMA MAKOTO , MIZUHARA TAKESHI , SHIBUSAWA HARUTAKA
IPC分类号： C22C33/04 , C22C1/02 , H01F1/053
摘要： PURPOSE:To manufacture the raw material for a rare earth permanent magnet contg. Dy and excellent in magnetic properties at low cost by manufacturing a Dy-Fe alloy by the use of Dy2O3, Fe and metallic Ca as a raw material, pulverizing this alloy, thereafter compacting and sintering it, successively adding the alloy to a molten metal contg. rare earth elements and other specified elements, melting it and executing solidification. CONSTITUTION:The powder of Dy2O3 and Fe is mixed with metallic Ca as a reducing agent, and this mixture is heated in an Ar atmosphere to reduce Dy2O3 by Ca and to manufacture a Dy-Fe series alloy. This alloy is finely pulverized and is thereafter compacted, and the obtd. green compact is sintered in the atmosphere of an inert gas or a reducing gas or in vacuum. On the other hand, the molten metal of an alloy in which one or more kinds among Sc, Y and lanthanoide series elements and other specified elements are melted by an other apparatus is mixed with the above sintered body, and the mixture is heated and melted. The raw material for a rare earth permanent magnet contg. no CaO as a reducing product and excellent in magnetic properties such as coercive force, residual magnetic flux density and maximum energy product can be manufactured at a low cost.

32. 发明专利

JPH03198304A MANUFACTURE OF MATERIAL POWDER FOR RARE EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH03198304A
公开(公告)日：1991-08-29
申请号：JP33906389
申请日：1989-12-27
申请人： HITACHI METALS LTD
发明人： USHIJIMA MAKOTO , MIZUHARA TAKESHI , SHIBUSAWA HARUTAKA
IPC分类号： B22F9/04 , C22C1/00 , C22C1/02 , H01F1/055 , H01F1/06 , H01F41/02
摘要： PURPOSE:To make it preserve the magnetic property peculiar to rare earth and reduce cost by using specific grain diameter of powder, which is obtained by mixing one or more kinds out of oxides, fluorides, sulfides, chlorides, nitrides, and carbonates of rare earth metal, and metal having Co as an indispensable ingredient, and metal Ca and classifying it after reduction by heating, as a main ingredient. CONSTITUTION:One ore more kinds out of oxides, fluorides, sulfides, chlorides, nitrides, carbonates of rare earth metal, and metal M (M is Co, Fe, Ni, Mo, etc., being indispensable ingredients), and metal Ca are mixed, and then are reduced after heating to produce RM alloy (R is Sc, Y, La, Ce, or the like), and the RM alloy is classified so that the ones of 10mum or more in grain diameter may exist 90wt.% or more. Next, it is made into a block shape at formation pressure of 0.3 ton/cm or more, and while making a compact contain RM ingredients by desired amounts within itself, such material is dissolved. Then it is made into powder form, thus it is made into desired material powder for magnet.

33. 发明专利

JPH01262602A MONOCRYSTAL FERRITE AND MAGNETIC HEAD 失效
公开(公告)号：JPH01262602A
公开(公告)日：1989-10-19
申请号：JP9192188
申请日：1988-04-14
申请人： HITACHI METALS LTD
发明人： KANAI KUNIO , USHIJIMA MAKOTO , NAKANISHI KENJI
IPC分类号： C01G49/00 , C30B29/22 , G11B5/127 , H01F1/34
摘要： PURPOSE:To obtain a monocrystal ferrite having high saturation magnetic flux density and high frequency mum by adding a fixed quantity of SnO2 to a composite whose contentment is located in a proportional region surrounded by lines connecting four points A-D having the fixed mol% of a composite (MnO, ZnO, Fe2O3) for subjecting to heat treatment in a reducing atmosphere. CONSTITUTION:0.1-5wt.% SnO2 is added to a composite, whose main composite (MnO, ZnO, FeO3) is located inside a quadriangle formed by lines connecting points A(21, 19, 60), B(21, 15, 64), C(24, 5, 11, 5, 64), D(24, 5, 15, 5, 60) in the mol% for being solid-soluted and treated in a reducing atmosphere less than 0.5% O2 at 400-1000 deg.C in order to obtain monocrystal ferrite having magnetic permeability not less than 250 at 8MHz. This material is especially suitable for magnetic heads of a high picture quality VTR using a highly hydrocarbonized tape.

34. 发明专利

JPS62143224A PRODUCTION OF MAGNETIC HEAD 失效
公开(公告)号：JPS62143224A
公开(公告)日：1987-06-26
申请号：JP28310785
申请日：1985-12-18
申请人： HITACHI METALS LTD
发明人： SHIMIZU YOSHIRO , OOTA YUKIO , TAGUCHI AKIRA , USHIJIMA MAKOTO
IPC分类号： G11B5/127 , G11B5/133 , G11B5/23 , G11B5/60
摘要： PURPOSE:To improve magnetic characteristics and to obviate the generation of voids in a joint part by pressing a winding groove side of a C core and are I core, forming a gap part by nonmagnetic ceramics and assembling the joint part of the opposite side thereof by making direct solid phase diffusion joining. CONSTITUTION:Thin nonmagnetic ceramic films 4b consisting of barium titanate or calcium titanate are formed by, for example, a sputtering vapor deposition method, etc., on the surfaces to form the gap part 4 of the C core 2a and I core 2b consisting of a magnetic material. On the other hand, the joint surface on the opposite side of the gap 4 is held intact. The C core 2a and I core 2b are pressed to each other and while pressing force (f) is exerted to the cores in an arrow direction, the cores are subjected to a heat treatment to hold the same for 4 hours at about 1,050 deg.C. The joint part 4a of the C core 1a and the I core 1b forms a cross-diffused layer by the direct solid phase reaction and is welded near the gap 4 to reinforce said part by inserting and melting a glass 5 in a winding grove part 2c.

35. 发明专利

JPS61295278A METHOD OF JOINING CERAMIC PART TO GLASS 失效
公开(公告)号：JPS61295278A
公开(公告)日：1986-12-26
申请号：JP13734185
申请日：1985-06-24
申请人： HITACHI METALS LTD
发明人： KANAI KUNIO , USHIJIMA MAKOTO , NARITA SHUNICHI , SHIMIZU YOSHIRO , GOTO MAKOTO , YAMAZAKI MASANOBU
IPC分类号： C04B37/00 , G11B5/105 , G11B5/133

36. 发明专利

JPS58185734A Production of permanent magnet alloy 失效
标题翻译：生产永磁体合金
公开(公告)号：JPS58185734A
公开(公告)日：1983-10-29
申请号：JP6631282
申请日：1982-04-22
申请人： Hitachi Metals Ltd
发明人： UCHIDA KIMIHO , USHIJIMA MAKOTO , MIZUHARA TAKESHI
IPC分类号： C22C1/00 , B22F3/10 , C22C1/04 , H01F1/04 , H01F1/053
摘要： PURPOSE: To produce a permanent magnet having an excellent magnetic characteristic at a low cost in the stage of producing a permanent magnet alloy consisting of a rare earth element and Co by using an oxide of a rare earth element as a raw material and melting the alloy of Co and a rare earth element.
CONSTITUTION: An inexpensive oxide of a rare earth element is used and a reducing agent such as Ca, Mg or the like and CO for an alloy compsn. are used for the same in the stage of producing a premanent magent expressed by the formula RCo
5 or R
2 CO
17 (R is ≥1 kind rare earth elements including Y). These materials are heated in an inert gaseous atmosphere to reduce the oxide of the rare earth elements and to diffuse the same mutually in Co, thereby forming an alloy. The unreduced oxide of the rare earth elements, the oxide CaO or MgO, of the reducing agents, etc. are interposed in the alloy in this case; therefore, the alloy is once melted to separate the above-mentioned unreduced oxide of the rare earth elements and the oxide of the reducing agent as molten slag, whereby the permanent magnet having an excellent magnetic characteristic is produced.
COPYRIGHT: (C)1983,JPO&Japio
摘要翻译：目的：通过使用稀土元素的氧化物作为原料，在制造由稀土元素和Co组成的永磁体合金的阶段中以低成本制造具有优异的磁特性的永磁体，并熔化合金的Co和稀土元素。构成：使用廉价的稀土元素氧化物，还可以使用Ca，Mg等还原剂和合金用的CO。在制备由式RCo5或R2CO17（R≥1种稀土元素包括Y）表示的前体魔法的阶段中使用相同。这些材料在惰性气体气氛中加热，以减少稀土元素的氧化物并使它们相互扩散在Co中，从而形成合金。在这种情况下，在合金中插入稀土元素的未还原氧化物，还原剂等的氧化物CaO或MgO; 因此，合金一旦被熔化，将上述稀土元素的未还原氧化物和还原剂的氧化物作为熔渣分离，由此产生具有优异磁特性的永磁体。

37. 发明专利

JPS58164759A PERMANENT MAGNET ALLOY 失效
公开(公告)号：JPS58164759A
公开(公告)日：1983-09-29
申请号：JP4684882
申请日：1982-03-24
申请人： HITACHI METALS LTD
发明人： KOBAYASHI AKIO , USHIJIMA MAKOTO , OGATA MASAO , ODA KOUICHI , TOYOSAKI NORIO
IPC分类号： C22C38/00 , C22C38/30 , C22C38/34 , C22C38/38 , C22C38/40 , H01F1/04
摘要： PURPOSE:To obtain a permanent magnet alloy with considerably enhanced coercive force by preparing an alloy contg. specified percentages of Fe, Cr, Co and Be. CONSTITUTION:An alloy consisting of, by weight, 17-35% Cr, 5-30% Co, 0.01-1% Be and the balance essentially Fe and having a columnar structure as its crystal structure is prepared. To the composition may be added 0.05-5.0% at least one of Si, Ti, Mo, W, Ni, V, Mn, Cu, Al, Nb, Zr, Ce and a rare earth element as a seconary component.

38. 发明专利

JPS5235719A METHOD OF MANUFACTURING PERMANENT MAGNETS WITH MAGNETIC ANISOTROPY 失效
公开(公告)号：JPS5235719A
公开(公告)日：1977-03-18
申请号：JP11095575
申请日：1975-09-16
申请人： HITACHI METALS LTD
发明人： USHIJIMA MAKOTO , HAMAZAKI MASAHIRO , MURANAKA KEIICHI
IPC分类号： B22D27/04 , B22C1/02 , B22C9/02 , B22D15/00 , H01F1/04

39. 发明专利

JPH0982510A RE-T-M-B SINTERED MAGNET EXCELLENT IN MAGNETIC CHARACTERISTIC 失效
公开(公告)号：JPH0982510A
公开(公告)日：1997-03-28
申请号：JP23415095
申请日：1995-09-12
申请人： HITACHI METALS LTD
发明人： NAKAMURA KEISUKE , OMORI TAKEO , USHIJIMA MAKOTO
IPC分类号： C22C33/02 , C22C38/00 , H01F1/057 , H01F1/08
摘要： PROBLEM TO BE SOLVED: To obtain a sintered magnet mass-producible and having an excellent magnetic characteristic by making the areas of crystal grains whose diameters are a specific value or more to the total area of the main-phase crystals of a magnet a specific value or more, the sum of the areas of crystal grains whose diameters are a specific value or less in a specific range, and magnetic characteristics Br, iHc specific values or more. SOLUTION: Ingots wherein RE-B-M-T are adjusted into various composition are manufactured, and they are finely ground into various average grain sizes after their coarse grinding. Two ingots having the same composition are ground into crystal grain diameters 4.3 and 5.2 microns, and they are mixed by a ratio of 50 to 50. The average grain size after the mixing is 4.7 microns, and the main-phase area ratio (%) after sintering is 50% or more for crystal grain diameters of 15 microns or more, and in a range of 2-5% for crystal grain diameters of 5 microns or less. Besides, its magnetic characteristics are in ranges Br>=12.8kG and iHc>=16kOe . By controlling the main-phase crystal grain diameter after sintering in this way, it becomes possible to obtain a high- performance magnet of high Br and iHc.

40. 发明专利

JPH07331486A CORROSION RESISTANT MAGNETIC ALLOY 失效
公开(公告)号：JPH07331486A
公开(公告)日：1995-12-19
申请号：JP12632394
申请日：1994-06-08
申请人： HITACHI METALS LTD
发明人： WATANABE JUNICHI , TAGAYA ATSUSHI , USHIJIMA MAKOTO
IPC分类号： C25D5/14 , C22C38/00 , C23C28/02 , C25D7/00 , H01F1/053 , H01F41/02
摘要： PURPOSE:To produce a corrosion resistant magnetic alloy improved in corrosion resistance and having high reliability by plating and laminating the surface of a magnetic base material alloy having a specified compsn. constituted of rare earth element, transition metals and B with Ni, Cu, Ni and P alloys in succession. CONSTITUTION:On the surface of a magnetic base material alloy having a compsn. contg., by weight, 5 to 40% R, 50 to 90% TM, 0.2 to 8% B (R denotes rare earth elements including Y, TM denotes transition metals consisting essentially of Fe, and in which a part can be replaced by other metallic and nonmetallic elements), a coating layer is formed. This coating layer is constituted of three plating layers obtd. by laminating an Ni plating layer as a base film of the alloy surface, a Cu plating layer as an intermediate layer and an Ni.P alloy plating layer as a surface layer in succession. This plating layers are preferably formed by electroplating capable of obtaining dense films. Thus, the practical R-TM-B magnetic alloy free from pinholes and excellent in corrosion resistance can be obtd.

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