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1. 发明专利

DE69401772T2 未知
公开(公告)号：DE69401772T2
公开(公告)日：1997-09-11
申请号：DE69401772
申请日：1994-10-24
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/02 , B22F1/00 , C22C1/04 , H01F1/057 , H01F1/08 , H01F41/02
摘要： It is an object of the present invention to provide a method of producing sintered- or bond- rare earth element.iron.boron magnets obtainable easily and superior in magnetic properties with stable performance. The method of producing sintered rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of mixing in a scheduled ratio an acicular iron powder coated with a coating material, a rare earth element powder coated with a coating material and a boron powder coated with a coating material, and subjecting the mixture to compression molding followed by sintering of the molded mixture in the presence of a magnetic field. The method of producing bond rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of preparing a magnet powder by hydrogen-disintegration of the above-mentioned sintered magnet wherein a hydrogen-occluded sintered magnet resulted from heating the magnet under hydrogen atmosphere is subjected to hydrogen emission under substantial vacuum to cause disintegration of the hydrogen-occluded sintered magnet, coating the magnet powder with a coating material, mixing the coated magnet powder with a binder, and compression molding the mixture under heating in the presence of a magnetic field.

2. 发明专利

DE69403059T2 未知
公开(公告)号：DE69403059T2
公开(公告)日：1997-08-28
申请号：DE69403059
申请日：1994-10-24
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/02 , C22C33/02 , C23C26/00 , H01F1/057 , H01F1/059 , H01F1/06 , H01F1/08
摘要： The material for permanent magnet according to the present invention comprises an acicular iron powder having successively on the surface (1) a coated layer of aluminum phosphate, (2) a diffused layer of rare earth element or a diffused layer of rare earth element.boron or a diffused layer of rare earth element.boron.nitrogen, and (3) a coated layer of aluminum phosphate. The material for permanent magnet can be produced by (a) a step of mixing and covering an acicular goethite (FeOOH) crystal with aluminum phosphate, (b) a step of preparing an acicular iron powder coated with a layer of aluminum phosphate by reducing under hydrogen atmosphere at 300-500 DEG C the acicular goethite (FeOOH) crystal covered by the aluminum phosphate, (c) a step of diffusing a rare earth element or a rare earth element and boron into the surface layer of aluminum phosphate by heating under argon atmosphere at 650-1000 DEG C the acicular iron powder coated with a layer of aluminum phosphate in the presence of the rare earth element or the rare earth element and boron, (d) a step of mixing and covering the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate, and (e) a step of coating the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate by heating under argon atmosphere at 300-500 DEG C the rare earth element diffused powder or rare earth element and boron diffused powder covered by the aluminum phosphate.

3. 发明专利

ES2097590T3 未知
公开(公告)号：ES2097590T3
公开(公告)日：1997-04-01
申请号：ES94112833
申请日：1994-08-17
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： H01F1/00 , C04B35/26 , C04B35/645 , H01F1/10 , H01F1/34

4. 发明专利

DK0697383T3 未知
公开(公告)号：DK0697383T3
公开(公告)日：1997-02-24
申请号：DK94112833
申请日：1994-08-17
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： H01F1/00 , C04B35/26 , C04B35/645 , H01F1/10 , H01F1/34

5. 发明专利

CA2119797A1 METHOD FOR PREPARING MULTILAYER DIELECTRIC POWDER CONDENSERS 未知
公开(公告)号：CA2119797A1
公开(公告)日：1994-09-30
申请号：CA2119797
申请日：1994-03-24
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： H01G4/30 , H01G4/06
摘要： The object of the present invention is to provide a method for preparing small-size and large capacity multilayer dielectric powder condensers capable of employing as the inner electrode materials inexpensive copper alloys or nickel alloys. The method for preparing multilayer dielectric powder condensers according to the present invention comprises steps of: providing a fine dielectric powder having a dielectric film on the surface of a metal powder or a semiconductor powder; preparing a pasty material by kneading the dielectric powder with an organic binder; forming a filmy sheet from the pasty material; applying a paste containing a metal powder for forming electrode on the surface of the filmy sheet and drying the applied sheet; piling a plurality of the sheets; placing the piled sheets between thin glass sheets made from a paste prepared by kneading a glass powder and an organic binder and pressing them together; and subjecting the piled and pressed sheets to a heat-treatment.

6. 发明专利

DE69403041D1 未知
公开(公告)号：DE69403041D1
公开(公告)日：1997-06-12
申请号：DE69403041
申请日：1994-09-26
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/00 , B22F1/02 , C22C33/02 , C22C38/00 , H01F1/057 , H01F1/06 , H01F7/02 , H01F41/02 , H01F1/08
摘要： The present invention aims at providing a powdery raw material composition for a permanent magnet superior in the magnetic properties and easy in preparation, a magnetically anisotropic permanent magnet, and a method for producing the magnet by use of the powdery raw material composition. A powdery raw material composition for a permanent magnet according to the present invention is one prepared by subjecting a mixture composed of 13-18 weight% of a neodymium powder, 4-10 weight% of a boron powder and the rest of an acicular iron powder coated with aluminum phosphate to a temperature above 600 DEG C in an atmosphere initially of a hydrogen-containing reducing gas followed later by an inert gas, and a magnetically anisotropic permanent magnet is prepared by compression molding a mixture obtained from the powdery composition and a binder under heating in the presence of a magnetic field.

7. 发明专利

AT152852T 未知
公开(公告)号：AT152852T
公开(公告)日：1997-05-15
申请号：AT94115131
申请日：1994-09-26
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/00 , B22F1/02 , C22C33/02 , C22C38/00 , H01F1/057 , H01F1/06 , H01F7/02 , H01F41/02 , H01F1/08
摘要： The present invention aims at providing a powdery raw material composition for a permanent magnet superior in the magnetic properties and easy in preparation, a magnetically anisotropic permanent magnet, and a method for producing the magnet by use of the powdery raw material composition. A powdery raw material composition for a permanent magnet according to the present invention is one prepared by subjecting a mixture composed of 13-18 weight% of a neodymium powder, 4-10 weight% of a boron powder and the rest of an acicular iron powder coated with aluminum phosphate to a temperature above 600 DEG C in an atmosphere initially of a hydrogen-containing reducing gas followed later by an inert gas, and a magnetically anisotropic permanent magnet is prepared by compression molding a mixture obtained from the powdery composition and a binder under heating in the presence of a magnetic field.

8. 发明专利

AT148439T 未知
公开(公告)号：AT148439T
公开(公告)日：1997-02-15
申请号：AT94112833
申请日：1994-08-17
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： H01F1/00 , C04B35/26 , C04B35/645 , H01F1/10 , H01F1/34

9. 发明专利

DE69401772D1 未知
公开(公告)号：DE69401772D1
公开(公告)日：1997-03-27
申请号：DE69401772
申请日：1994-10-24
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/02 , B22F1/00 , C22C1/04 , H01F1/057 , H01F1/08 , H01F41/02
摘要： It is an object of the present invention to provide a method of producing sintered- or bond- rare earth element.iron.boron magnets obtainable easily and superior in magnetic properties with stable performance. The method of producing sintered rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of mixing in a scheduled ratio an acicular iron powder coated with a coating material, a rare earth element powder coated with a coating material and a boron powder coated with a coating material, and subjecting the mixture to compression molding followed by sintering of the molded mixture in the presence of a magnetic field. The method of producing bond rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of preparing a magnet powder by hydrogen-disintegration of the above-mentioned sintered magnet wherein a hydrogen-occluded sintered magnet resulted from heating the magnet under hydrogen atmosphere is subjected to hydrogen emission under substantial vacuum to cause disintegration of the hydrogen-occluded sintered magnet, coating the magnet powder with a coating material, mixing the coated magnet powder with a binder, and compression molding the mixture under heating in the presence of a magnetic field.

10. 发明专利

AT149065T 未知
公开(公告)号：AT149065T
公开(公告)日：1997-03-15
申请号：AT94116750
申请日：1994-10-24
申请人： TAKAHASHI YASUNORI
发明人： TAKAHASHI YASUNORI
IPC分类号： B22F1/02 , B22F1/00 , C22C1/04 , H01F1/057 , H01F1/08 , H01F41/02
摘要： It is an object of the present invention to provide a method of producing sintered- or bond- rare earth element.iron.boron magnets obtainable easily and superior in magnetic properties with stable performance. The method of producing sintered rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of mixing in a scheduled ratio an acicular iron powder coated with a coating material, a rare earth element powder coated with a coating material and a boron powder coated with a coating material, and subjecting the mixture to compression molding followed by sintering of the molded mixture in the presence of a magnetic field. The method of producing bond rare earth element.iron. boron magnets according to the present invention is characterized by that it comprises steps of preparing a magnet powder by hydrogen-disintegration of the above-mentioned sintered magnet wherein a hydrogen-occluded sintered magnet resulted from heating the magnet under hydrogen atmosphere is subjected to hydrogen emission under substantial vacuum to cause disintegration of the hydrogen-occluded sintered magnet, coating the magnet powder with a coating material, mixing the coated magnet powder with a binder, and compression molding the mixture under heating in the presence of a magnetic field.

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