RARE-EARTH MAGNET
PROBLEM TO BE SOLVED: To reduce the eddy current loss of a sintered permanent magnet in relation to a rare earth magnet, and to provide a method of manufacturing the same. SOLUTION: In a ferromagnetic material containing at least one kind of a rare-earth element, a layer containing at least one kind...
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| creator | KOZONO YUZO KOMURO MATAHIRO SATSUU YUUICHI MAEDA KUNIHIRO |
| description | PROBLEM TO BE SOLVED: To reduce the eddy current loss of a sintered permanent magnet in relation to a rare earth magnet, and to provide a method of manufacturing the same. SOLUTION: In a ferromagnetic material containing at least one kind of a rare-earth element, a layer containing at least one kind or more of alkaline earth element or a rare-earth element and a fluorine is formed in the grain boundary of the ferromagnetic material or the part near the powder surface. At least one kind or more of the rare-earth element is contained adjacent to the part of the layer. A layer, having a lower fluorine concentration than that of the layer and a higher rare-earth element concentration than the host phase of the ferromagnetic material or the oxide layer containing the rare-earth element is formed. It has loss-reducing effect. It can be applied to a magnetic circuit which is exposed to a high-frequency magnetic field. The improvement in the efficiency as a whole, and the noise reducing effect of the magnetic circuit due to loss-reducing effect can be expected. COPYRIGHT: (C)2006,JPO&NCIPI |
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SOLUTION: In a ferromagnetic material containing at least one kind of a rare-earth element, a layer containing at least one kind or more of alkaline earth element or a rare-earth element and a fluorine is formed in the grain boundary of the ferromagnetic material or the part near the powder surface. At least one kind or more of the rare-earth element is contained adjacent to the part of the layer. A layer, having a lower fluorine concentration than that of the layer and a higher rare-earth element concentration than the host phase of the ferromagnetic material or the oxide layer containing the rare-earth element is formed. It has loss-reducing effect. It can be applied to a magnetic circuit which is exposed to a high-frequency magnetic field. The improvement in the efficiency as a whole, and the noise reducing effect of the magnetic circuit due to loss-reducing effect can be expected. 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| subjects | ALLOYS BASIC ELECTRIC ELEMENTS CHEMISTRY CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DYNAMO-ELECTRIC MACHINES ELECTRICITY FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION INDUCTANCES MAGNETS METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSFORMERS TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | RARE-EARTH MAGNET |
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