Browse Prior Art Database

High Temperature Square Loop Ferrites

IP.com Disclosure Number: IPCOM000095865D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Dubetsky, DJ: AUTHOR [+2]

Abstract

Square loop ferrites having a Curie temperature of at least 400 degrees C are formed from Cu Fe(2)O(4), Li(0.5), Fe(2.5)O(4) and Ni Fe(2)O(4) in the required proportions to produce a ferrite represented by the formula: Cu(x) Li(y) Ni(z) Fe(3-x-y-z) O(4) where x: is 0. 1 to 0.5 y:is 0.2 to 0.4 z:is 0.05 to 0.09

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

High Temperature Square Loop Ferrites

Square loop ferrites having a Curie temperature of at least 400 degrees C are formed from Cu Fe(2)O(4), Li(0.5), Fe(2.5)O(4) and Ni Fe(2)O(4) in the required proportions to produce a ferrite represented by the formula: Cu(x) Li(y) Ni(z) Fe(3-x-y-z) O(4) where x: is 0. 1 to 0.5 y:is 0.2 to 0.4 z:is 0.05 to 0.09

The raw oxide materials are ball milled for a period between 2 to 16 hours, calcined at a temperature between 600 degrees C to 800 degrees C for a selected period, then remilled. Binder or lubricant is added and the material pelletized to a screen size between -80 +325.

The pelletized material is pressed to a green density between 2. 5 and 3. 5 gr/cc, sintered at a temperature between 1100 degrees C to 1400 degrees C, and, thereafter, furnace cooled to a temperature lower than the sintering temperature but which is sufficiently high to maintain oxidation. The ferrite material is then cooled to room temperature.

In this manner, temperature stable square loop ferrites are provided for storage application.

1