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Improved Ferrite Storage Devices by Storing them at Elevated Temperatures

IP.com Disclosure Number: IPCOM000091354D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gogos, B: AUTHOR

Abstract

A process is provided for fabricating square-loop cores of the copper manganese ferrite system such that the cores are characterized by improved magnetic properties.

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Improved Ferrite Storage Devices by Storing them at Elevated Temperatures

A process is provided for fabricating square-loop cores of the copper manganese ferrite system such that the cores are characterized by improved magnetic properties.

Ferrite powders from the copper manganese ferrite system are first mixed and calcined at a temperature between 600 to 1000 degrees C for a period of several hours. That reaction product is then thoroughly mixed so as to form a homogeneous mixture of predetermined portions. That mixture is subsequently ground so that the largest grain size is less than a predetermined value. A small amount of lubricant is added to reduce skin friction and warping during molding. The mixture is then compacted in a steel die to form a closely coherent body. Then it is fired at a temperature between 1100 degrees to 1300 degrees C in air, for a preselected period of time and then quenched to room temperature.

These cores then undergo an aging process. The fired cores made of the copper manganese ferrite are placed in a furnace and aged at a temperature between 150 degrees to 200 degrees C for a period between a few hours to about sixty hours. The resultant delta noise is substantially reduced and, consequently, the signal-to-noise ratio in the core storage array application is improved.

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