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Browse Prior Art Database

Ferromagnetic Material

IP.com Disclosure Number: IPCOM000097818D
Original Publication Date: 1961-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cook, MH: AUTHOR

Abstract

Low coercive ferromagnetic material is made from iron oxide, manganese oxide, zinc oxide and copper oxide. The material has a Curie temperature in the order of 100 degrees C while exhibiting a substantially rectangular hysteresis loop.

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This is the abbreviated version, containing approximately 100% of the total text.

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Ferromagnetic Material

Low coercive ferromagnetic material is made from iron oxide, manganese oxide, zinc oxide and copper oxide. The material has a Curie temperature in the order of 100 degrees C while exhibiting a substantially rectangular hysteresis loop.

Cores are fabricated from this material by calcining the powders of the oxides in the desired proportions at a temperature ranging from 750 to 900 degrees C. The calcined powder is then pressed to a density of approximately 2.5 to 3.5 grams per cc and sintered at a temperature ranging from 1200 to 1450 degrees
C. The cores are then furnace cooled from the sintering temperature to a temperature between 750 to 1000 degrees C and then metal plate quenched to room temperature. The cores are cooled from their peak sintering temperature to room temperature within two hours.

The range of constituents in the material, in mol per cent by weight, is: 30- 45% ferric oxide, 30-50% manganese oxide, 2-6%, copper oxide and 10-20% zinc oxide.

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