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21. 发明专利

JP2002252141A ELECTRONIC COMPONENT 失效
公开(公告)号：JP2002252141A
公开(公告)日：2002-09-06
申请号：JP2001051050
申请日：2001-02-26
申请人： HITACHI METALS LTD
发明人： TANIGUCHI FUMITAKE
IPC分类号： C23C18/31 , C23C18/32 , C25D5/54 , C25D7/00 , H01G4/252
摘要： PROBLEM TO BE SOLVED: To provide an electronic component which is superior in terminal adhesion strength and solder wettability. SOLUTION: An electronic component is composed of a ceramic base body and a plurality of external electrodes fixed to the base body. The external electrode is composed of a lower layer, formed on the ceramic base body and a conductor layer formed on the surface of the lower layer by electroplating or electroless plating, and the hydrogen content of the conductor layer is 0.05 wt.% or lower.

22. 发明专利

JPH11273922A Sintered permanent magnet 有权
标题翻译：烧结永磁体
公开(公告)号：JPH11273922A
公开(公告)日：1999-10-08
申请号：JP2392899
申请日：1999-02-01
申请人： Hitachi Metals Ltd , 日立金属株式会社
发明人： UCHIDA KIMIO , TAKAHASHI MASAHIRO , TANIGUCHI FUMITAKE
IPC分类号： B22F9/04 , B22F1/00 , C22C38/00 , H01F1/053 , H01F1/057 , H01F1/08
CPC分类号： H01F1/0577
摘要： PROBLEM TO BE SOLVED: To improve the corrosion-resistance of a R-Fe-B sintered permanent magnet, while maintaining high magnetic characteristics.
SOLUTION: R (R is at least one kind of rare earth elements including Y) is 27.0-31.0 wt.% B is 0.5-2.0 wt.%, N is 0.02-0.15 wt.% O is 0.25 wt.% or less, C is 0.15 wt.% or less, with remaining part being Fe. An R-Fe-b quenched alloy for the sintered permanent magnet which comprises two-phase composition corresponding to substantially a main phase and R-rich phase of the permanent magnet is used for manufacture.
COPYRIGHT: (C)1999,JPO
摘要翻译：要解决的问题：为了提高R-Fe-B烧结永磁体的耐腐蚀性，同时保持高的磁特性。解决方案：R（R是至少一种包括Y的稀土元素）为27.0-31.0重量％B为0.5-2.0重量％，N为0.02-0.15重量％，O为0.25重量％以下， C为0.15重量％以下，剩余部分为Fe。用于烧结永磁体的R-Fe-b淬火合金，其用于制造相当于实质上主相和永磁体的富R相的两相组成。

23. 发明专利

JPH10289813A RARE-EARTH MAGNET 失效
公开(公告)号：JPH10289813A
公开(公告)日：1998-10-27
申请号：JP9861397
申请日：1997-04-16
申请人： HITACHI METALS LTD
发明人： TOKORO HISATO , TANIGUCHI FUMITAKE
IPC分类号： C22C38/00 , H01F1/053 , H01F1/057
摘要： PROBLEM TO BE SOLVED: To inhibit the oxidization of rare-earth elements being contained in an R-T-B rare-earth magnet alloy and to reduce the B-rich phase of a rake- earth magnet while an increase in the coarseness of the R2 T14 B main phase of the magnet is suppressed by a method wherein the magnet has a composition consisting of R, B, Co, M, oxygen, nitrogen and carbon, which respectively have a specified wt.%, with the balance of Fe, the coersive force of the magnet at a specified temperature is specified and at the same time, the area ratio of the B-rich phase is specified. SOLUTION: A rare-earth magnet has a composition consisting of 27.0 to 31.0 wt.% of R (The R is one kind of the element or more than two kinds of the elements out of rare-earth elements including Y.), 0.8 to 1.02 wt.% of B, 0.5 to 50 wt.% of Co, 0.01 to 1.0 wt.% of M (The M is one kind of the element or more than two kinds of the elements out of Ga, Al and Cu), 0.25 wt.% or lower of oxygen, 0.02 to 0.15 wt.% of nitrogen and 0.15 wt.% or lower of carbon with the balance of Fe. Moreover, the coercive force of the magnet at 20 deg.C is 13 kOe or higher and at the same time, the area ratio of the B-rich phase of the magnet is 0 to 0.5% and the area ratio of main phase crystal grains of a grain diameter of 16 μm or wider is 10% or lower.

24. 发明专利

JPH1022155A MANUFACTURE OF RARE-EARTH PERMANENT MAGNET AND RARE-EARTH PERMANENT MAGNET 失效
公开(公告)号：JPH1022155A
公开(公告)日：1998-01-23
申请号：JP17610096
申请日：1996-07-05
申请人： HITACHI METALS LTD
发明人： UCHIDA KIMIO , TAKAHASHI MASAHIRO , TANIGUCHI FUMITAKE
IPC分类号： B22F3/02 , C22C38/00 , H01F1/057 , H01F1/08 , H01F41/02 , B22F3/087
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method by which a rare-earth permanent magnet having a long thin ring-like shape can be manufactured easily and the oxidation of the magnet can be suppressed during the manufacturing process and a rare-earth permanent magnet manufactured by the method. SOLUTION: In a method for manufacturing rare-earth permanent magnet, R-Fe-B (R: one or more kinds of rare earth elements including Y) coarse particles for rare-earth permanent magnet are finely pulverized in a nitrogen gas flow, argon gas flow, or nitrogen-argon mixed gas flow containing oxygen at a concentration of >=0.005vol.% and slurry is prepared by mixing recovered fine particles in mineral oil or synthetic oil which belongs to the Class 2 or 3 of Group 4 petroleums classified by Fire Protection Law and has a flashing point of >=21 deg.C and

25. 发明专利

JPH09260122A SINTERED PERMANENT MAGNET 失效
公开(公告)号：JPH09260122A
公开(公告)日：1997-10-03
申请号：JP9040096
申请日：1996-03-19
申请人： HITACHI METALS LTD
发明人： UCHIDA KIMIO , TAKAHASHI MASAHIRO , TANIGUCHI FUMITAKE
IPC分类号： C22C38/00 , H01F1/053 , H01F1/057 , H01F1/08
摘要： PROBLEM TO BE SOLVED: To improve the corrosion resistance by using an R-Fe-B based sintered permanent magnet having a specified main phase crystal grain size or less. SOLUTION: A sintered permanent magnet has a compsn. R (one or more rare earth elements, including Y) 27.0-31.0wt.%, B 0.52.0wt.%, N 0.02-0.15wt.%, O 0.25wt.% or less (not (0wt.%), C 0.15wt.% (not 0wt.%) and Fe. The area sum of the main phase crystal grains of 10μm or less is 80% of the total area of the magnet main phase or more and the area sum of those grains of 13μm or more is 10% or less. Part of Fe of this magnet may be substituted by at least one of Nb 0.1-2.0wt.%, Al 0.02-2.0wt.%, Co 0.3-5.0wt.%, Ga 0.01-0.5wt.%, and Cu 0.01-1.0wt.%. Thus it is possible to obtain an R-Fe-B based sintered permanent magnet superior in corrosion resistance, without deteriorating the magnetic characteristics.

26. 发明专利

JPH09232173A MANUFACTURE OF RARE EARTH MAGNET, AND RARE EARTH MAGNET 失效
公开(公告)号：JPH09232173A
公开(公告)日：1997-09-05
申请号：JP4009996
申请日：1996-02-27
申请人： HITACHI METALS LTD
发明人： TANIGUCHI FUMITAKE , UCHIDA KIMIO , ENDO MINORU
IPC分类号： C22C38/00 , H01F1/053 , H01F1/057 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To provide a permanent magnet with excellent magnetic characteristics by restricting the oxidation of a rare earth element. SOLUTION: This rare earth magnet contains 26.7 to 32wt.% of R (R is 1 kind or 2 kinds or more among rare earth elements containing Y), 0.9 to 2.0wt.% of B, and 0.1 to 3.0wt.% of M (M is at least 1 kind or more of Ga, Al and Cu), the remainder comprises an alloy A with R2 Fe14 B containing Fe as main body and an alloy B comprising 35 to 70wt.% of R, 5 to 50wt.% of Co, 0.1 to 3.0wt.% of M with the remainder consisting of Fe, with which the coarse powder of 1 to 30wt.% of B alloy is mixed for the coarse powder of 70 to 99wt.% of alloy A as mixed coarse powder raw material. This pulverized in a inert gas practically having 0% of oxygen, fine powder is directly recovered in a solvent containing mineral oil, synthesized oil, vegetable oil of their mixture in the atmosphere of inert gas and is turned into slurry, the raw material of the slurry is wet formed in a magnetic field, a molded body is desolvent-treated in vacuum and then sintering is performed.

27. 发明专利

JPH0888133A MANUFACTURE OF RARE EARTH ELEMENT MAGNET 失效
公开(公告)号：JPH0888133A
公开(公告)日：1996-04-02
申请号：JP22447394
申请日：1994-09-20
申请人： HITACHI METALS LTD
发明人： UCHIDA KIMIO , TAKAHASHI MASAHIRO , TANIGUCHI FUMITAKE
IPC分类号： B22F3/02 , H01F1/055 , H01F1/057 , H01F1/08 , H01F41/02
摘要： PURPOSE: To enhance the magnetic characteristics by a method wherein a material mixture with a material fine particles for rare earth element sintered magnet is manufactured using a solvent such as mineral oil, synthetic oil, plant oil, etc., to be wet-molded for manufacturing a rare earth element sintered magnet body by dissolvent sintering steps. CONSTITUTION: Within the manufacturing method of rare earth element permanent magnet comprising R-Co5 base, R2 Co17 base, R-Fe-B base (R represents one kind or two or more kinds of rare earth elements including Y) is wet-fine crushed in a solvent such as mineral oil, synthetic oil, plant oil, etc., to manufacture a material mixture comprising a solvent and fine particles, next this material mixture is wet-molded in a magnetic field into a molded body later a sintered body by dissolvent and sintering steps. Through these procedures, the title rare earth element permanent magnet sintered body containing a small quantity of oxygen, nitrogen, carbon can be manufactured, thereby enabling the high magnetic characteristics to be displayed.

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