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1. 发明专利

CA2044171A1 CORROSION-RESISTANT RARE EARTH METAL-TRANSITION METAL SERIES MAGNETS AND METHOD OF PRODUCING THE SAME 未知
公开(公告)号：CA2044171A1
公开(公告)日：1991-04-13
申请号：CA2044171
申请日：1990-10-11
申请人： KAWASAKI STEEL CO
发明人： OZAKI YUKIKO , SHIMOTOMAI MICHIO , FUKUDA YASUTAKA , FUJITA AKIRA , KITANO YOKO , SHIMOMURA JUNICHI
IPC分类号： C22C33/02 , C22C1/04 , C22C19/00 , C22C19/07 , C22C38/00 , H01F1/053 , H01F1/057 , H01F41/02 , H01F1/08
摘要： This invention provides permanent magnets being considerably excellent in not only magnetic properties but also corrosion resistance by using magnetically useful two phases, i.e. RE2TM14B phase having a high residual magnetic flux density and a low melting point RE-TM phase or RE-TM-B phase enhancing the sinterability and possessing a cleaning action against grain boundary of main phase and further forming an electrochemically noble composition as a starting material to prepare a two phase magnet.

2. 发明专利

CA1338462C CORROSION RESISTANT RARE EARTH METAL MAGNET 未知
公开(公告)号：CA1338462C
公开(公告)日：1996-07-23
申请号：CA579833
申请日：1988-10-07
申请人： KAWASAKI STEEL CO
发明人： SHIMOTOMAI MICHIO , FUKUDA YASUTAKA , FUJITA AKIRA
IPC分类号： C22C19/07 , C22C38/10 , H01F1/057 , H01F1/055
摘要： A rare earth metal-transition metal type magnet alloy having excellent coercive force, squareness, corrosion resistance and temperature characteristics is disclosed, which alloy consists of at least one of Y and lanthanoid; B; occasionally at least one of Mg, A?, Si, Ca, Ti, V, Cr, Mn, Cu, Zn, Ga, Ge, Zr, Nb, Mo, In, Sn, Ta and W; and the remainder being substantially transition metals of Fe, Co and Ni.

3. 发明专利

JP2553278B2 失效
公开(公告)号：JP2553278B2
公开(公告)日：1996-11-13
申请号：JP11756292
申请日：1992-05-11
申请人： KAWASAKI STEEL CO
发明人： SHIMOTOMAI MICHIO , FUKUDA YASUTAKA , FUJITA AKIRA
IPC分类号： C22C38/00 , C22C38/10 , H01F1/053 , H01F1/057

4. 发明专利

JPH01289101A MANUFACTURE OF RARE EARTH TRANSITION METALLIC MAGNET ALLOY POWDER 失效
公开(公告)号：JPH01289101A
公开(公告)日：1989-11-21
申请号：JP11712188
申请日：1988-05-16
申请人： KAWASAKI STEEL CO
发明人： FUJITA AKIRA , FUKUDA YASUTAKA , SHIMOTOMAI MICHIO
IPC分类号： B22F9/20 , C22C38/00 , H01F1/055 , H01F1/057 , H01F1/06
摘要： PURPOSE:To enhance the corrosion resistance and the temperature characteristics without deteriorating the magnetic characteristics by a method wherein a mixture in the specific composition containing rare earth oxide is heat-treated and then washed away to remove any by-product of reaction. CONSTITUTION:A mixture meeting the following requirements is prepared i.e. a material powder comprising respective powders such as rare earth element (Rem) oxide containing Y, ferroboron, boron oxide, iron, cobalt, nickel, ferrocobalt alloy, cobalt nickel alloy, ferronickel, iron oxide, cobalt oxide and nickel oxide is properly selected so that the mixture may contain Rem:8-30 at.%, B:2-20at.% with the residual parts substantially comprising Fe, Co, Ni subject to respective blended amount of Fe:10-75at.%, Co:7-50at.%, Ni:8-30at.% as well as (Fe+Co+Ni):50-90at.%. Then, metallic Ca or CaH2 is blended with the mixture to be heated in inert gas atmosphere up to 800-1200 deg.C causing reduction.diffusion reaction and after being cooled down, a reaction product is washed away to remove any by-product of the reaction.

5. 发明专利

JPS6474706A PLATE RESIN-BONDED MAGNET EXCELLENT IN RESISTANCE TO OXIDATION 失效
公开(公告)号：JPS6474706A
公开(公告)日：1989-03-20
申请号：JP23098387
申请日：1987-09-17
申请人： KAWASAKI STEEL CO
发明人： FUJITA AKIRA , SHIMOTOMAI MICHIO
IPC分类号： H01F7/02 , H02K15/03
摘要： PURPOSE:To lessen deterioration of magnetic characteristics due to oxidation even if it is in hot and humid place in bad surroundings by sandwiching both faces of a plate magnetic body formed of resin and magnetic powder composed of rare earth elements, transition metal elements and boron between metallic thin films or resin films on which surface treatment is performed. CONSTITUTION:Magnetic powder 2 composed of rare earth elements, transition metal elements and boron is made to crush to pieces, for instance, magnet alloy ingots melted in vacuum or inactive surroundings or ribbons which are obtained by jetting melting after high frequency dissolution on a rotating roller surface. And metal or film-shaped organic polymer resin 1 on which surface preparation such as chromate treatment is performed is bonded on the surface of a magnet body formed into a plate-shaped after the magnetic powder and resin are kneaded. The thickness of metal or film-shaped resin is suitable for 0.5mm or less. The material of metal sheets is also suitable for A1 and non-magnetic steel plates and the like in order that the disturbance of line of magnetic force is lessened. The film-shaped resin is suitable for polypropylene, polyethylene and the like of low water absorption. Polyamide resin is used as one kneaded with the magnetic powder.

6. 发明专利

JP2002134331A SOFT FERRITE CORE AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002134331A
公开(公告)日：2002-05-10
申请号：JP2000326636
申请日：2000-10-26
申请人： KAWASAKI STEEL CO
发明人： KONO TAKASHI , FUJITA AKIRA , GOTO SATOSHI
IPC分类号： H01F1/34 , H01F27/255 , H01F41/02
摘要： PROBLEM TO BE SOLVED: To provide a soft ferrite core which is small in core loss at high frequencies and has a superior frequency characteristics, even if the core has a large size with its hard-to-diffuse region having a cross-sectional area of >=100 mm2. SOLUTION: The soft ferrite core is constituted, when the core is divided into many parts having nearly same weights and shapes and the specific resistance values of the divided parts are measured, the volume fraction of the parts having specific resistance values smaller than that of the means specific resistance value of the divided parts becomes

7. 发明专利

JP2000286119A FERRITE 失效
公开(公告)号：JP2000286119A
公开(公告)日：2000-10-13
申请号：JP8833199
申请日：1999-03-30
申请人： KAWASAKI STEEL CO
发明人： FUJITA AKIRA , GOTO SATOSHI
IPC分类号： C01G49/00 , H01F1/34
摘要： PROBLEM TO BE SOLVED: To provide a ferrite which is low in loss and has a high saturated magnetic flux density and the loss, of which has low temperature dependence over a relatively wide frequency band of about 100 kHz to about 500 kHz. SOLUTION: A ferrite contains 0.0050-0.0500 wt.% SiO2 and 0.0200-0.2000 wt.% CaO as accessory ingredients in addition to basic ingredient composed of 52-56 mol% Fe2O3, 6-14 mol% ZnO, 4 mol% NiO or lower, 0.01-0.6 mol% CoO, and a balance of substantially MnO. The ferrite also contains at least one kind of molecule selected from among Ta2O5, ZrO2, Nb2O5, V2O5, K2O, TiO2, SnO2, and HfO2 as accessory ingredients. Each component of the ferrite is selected, so that the temperature at which the loss measured by means of an AC BH tracer under the measurement conditions of 100 kHz frequency and 200 mT maximum magnetic flux density becomes minimum to within the range of 50-85 deg.C.

8. 发明专利

JPH10326706A MANGANESE-NICKEL-BASED FERRITE MATERIAL 失效
公开(公告)号：JPH10326706A
公开(公告)日：1998-12-08
申请号：JP13495397
申请日：1997-05-26
申请人： KAWASAKI STEEL CO
发明人： GOTO SATOSHI , FUJITA AKIRA , KONO TAKASHI
IPC分类号： C01G49/00 , C04B35/28 , H01F1/34
摘要： PROBLEM TO BE SOLVED: To obtain an Mn-Ni-based ferrite material whose loss is low at a specific high frequency or higher, whose sintered density is high and whose strength is high by a method wherein Fe2 O3 and NiO are contained as well as SiO2 and CaO as well as one or both at of K2 O and Na2 O3 in a total specific wt.% are contained as the remainder in a fundamental component composed substantially of MnO. SOLUTION: In a composition, 55 to 68 mol.% of Fe2 O3 and 0.5 to 11 mol.% of NiO are contained as well as 0.02 to 0.10 wt.% of SiO2 and 0.03 to 0.30 wt.% of CaO as well as one or both out of K2 O and Na2 O in a total of 0.01 to 0.20 wt.% are contained as the remainder in a fundamental composition composed substantially of MnO. Fe2 O3 , NiO and MnO in the above quantities are compounded so as to be wet-mixed and then dried. SiO2 , CaO and K2 O in the above quantities are added to a temporarily baked power obtained by baking their mixture in an air atmosphere temporarily. This mixture is pulverized so as to be dried. Then, a polyvinyl alcohol aqueous solution is added to this powder, and a granulated powder is then formed to be a ring shape so as to be fired in a gas which suppresses an oxygen partial pressure and in which nitrogen in mixed with air.

9. 发明专利

JPH04338606A MANUFACTURE OF CORROSION-RESISTANT RARE EARTHTRANSITION METAL MAGNET 失效
公开(公告)号：JPH04338606A
公开(公告)日：1992-11-25
申请号：JP13943491
申请日：1991-05-16
申请人： KAWASAKI STEEL CO
发明人： OZAKI YUKIKO , SHIMOTOMAI MICHIO , FUKUDA YASUTAKA , FUJITA AKIRA , KOGIKU FUMIO
IPC分类号： H01F1/053 , H01F1/057 , H01F1/08 , H01F41/02
摘要： PURPOSE:To improve the coercive force by mixing the powder mainly composed of intermetal compounds of specified composition with the powder of specified composition which is lower in melting point than it and is made in advance, and then pressing it and sintering it. CONSTITUTION:The mixed powder between powder, which is mainly composed of RE2TM14B intermetal compound phase, and power, which is mainly composed of a nonstoichiometic RE-TM alloy phase excluding eutectic composition lower in melting point than that of this powder and/or nonstoichiometic RE-TM-M alloy phase is compressed and molded, and then it is sintered. But, RE is one or two or more kinds selected from Y, Sc, and lanthanides, and TM is one or two or more kinds selected from Fe, Co, and Ni. Moreover, RE is one or two or more kinds selected from Y, Sc, and lanthanides, and TM is Ni or the mixture of Ni, Fe, and Co. And the ratio of Ni and/or Co which occupies in the TM in the RE--TM and RETM-B low melting point phase is made higher than that of RE2TM14 phase.

10. 发明专利

JPH04198410A PRODUCTION OF ALLOY POWDER FOR RARE EARTH ELEMENT-TRANSITION METAL MAGNET 失效
公开(公告)号：JPH04198410A
公开(公告)日：1992-07-17
申请号：JP32575890
申请日：1990-11-29
申请人： KAWASAKI STEEL CO
发明人： FUJITA AKIRA , SHIMOTOMAI MICHIO
IPC分类号： B22F9/04 , C22C33/02 , C22C38/00 , H01F1/053 , H01F1/057 , H01F1/06
摘要： PURPOSE:To unnecessitate dehydrogenation and to obtain a sintered magnet contg. a small amt. of residual hydrogen by using an inert gaseous atmosphere contg. a specified amt. of hydrogen when an RE-Fe-B type magnet alloy having a specified compsn. is roughly crushed with hydrogen. CONSTITUTION:An alloy ingot contg., by atom, 10-25% RE (one or more among Y and lanthanoids), 2-15% B and 60-88%, in total, of 10-73% Fe, 7-50% Co and 5-30% Ni is exposed to an inert gaseous atmosphere contg. 3-70vol.% hydrogen to absorb hydrogen in the ingot and this ingot is crushed. The resulting coarse alloy powder is directly pulverized without carrying out dehydrogenation.

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