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Sintering Process for Ferrite Cores

IP.com Disclosure Number: IPCOM000096526D
Original Publication Date: 1963-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Vinal, AW: AUTHOR

Abstract

This two-step sintering process for ferrite cores takes advantage of a discovery which permits reversible control of the coercive threshold of sintered cores by controlling the cooling (quench) rate of the core. Further development of this technique, permits optimum minimization of the 0 read-out response signal thus providing means of maximizing the 1 to 0 signal ratio.

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Sintering Process for Ferrite Cores

This two-step sintering process for ferrite cores takes advantage of a discovery which permits reversible control of the coercive threshold of sintered cores by controlling the cooling (quench) rate of the core. Further development of this technique, permits optimum minimization of the 0 read-out response signal thus providing means of maximizing the 1 to 0 signal ratio.

The first step in the two-step firing cycle is the 0 sintering cycle. In this step, the temperature-time product is controlled to produce the optimum 0 response characteristic. Cores thus fired can be stockpiled or immediately processed by step two.

The second step, called Quench Rate Annealing Cycle, optimizes the 1 or coercive threshold characteristic. For this step, the core temperature is initially raised to a value less than that of the first step. It is then cooled at the proper quench rate to provide the desired coercive force. This step can be repeated to reversibly alter the coercive threshold.

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