CONSOLIDATION OF EXCHANGE-COUPLED MAGNETS USING EQUAL CHANNEL ANGLE EXTRUSION

CONSOLIDATION OF EXCHANGE-COUPLED MAGNETS USING EQUAL CHANNEL ANGLE EXTRUSION

The present invention employs Equal Channel Angular Extrusion (ECAE) to consolidate Fe16N2, Fe4N, Sm2Fe17Nx, either alone or in combination with other magnetic powders made from Nd2Fe14B, SmCo5, Sm2Co17, Sm2Fe17Nx and MnBi to prepare dense bodies at temperatures as low as room temperature or as high...

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Bibliographische Detailangaben
Hauptverfasser: KECSKES LASZLO JOHN, SANKAR SURYANARAYAN G
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Beschreibung
Zusammenfassung:The present invention employs Equal Channel Angular Extrusion (ECAE) to consolidate Fe16N2, Fe4N, Sm2Fe17Nx, either alone or in combination with other magnetic powders made from Nd2Fe14B, SmCo5, Sm2Co17, Sm2Fe17Nx and MnBi to prepare dense bodies at temperatures as low as room temperature or as high as 800° C., depending on the composition. When a soft magnetic material such as alpha-Fe powder or Fe4N powder is mixed with a hard magnetic material such as Nd2Fe14B, SmCo5, Sm2Co17 or Sm2Fe17Nx or MnBi or FeCr alloys or a semi-hard material such as Fe16N2, exchange-coupled magnets are obtained. This is due to the fact that the current theory on exchange-coupling phenomena indicates that a nanocrystalline size of the soft magnetic material is a necessary condition for the promotion of exchange-coupling.