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Ferromagnetic Material

IP.com Disclosure Number: IPCOM000098358D
Original Publication Date: 1960-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Aghajanian, HA: AUTHOR

Abstract

The low flux density ferromagnetic material consists of manganese ferrite with lithium and titanium added. This material has a flux density of approximately 1000 gausses while retaining suitable squareness and a suitably high Curie temperature.

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Ferromagnetic Material

The low flux density ferromagnetic material consists of manganese ferrite with lithium and titanium added. This material has a flux density of approximately 1000 gausses while retaining suitable squareness and a suitably high Curie temperature.

In the preparation of cores from these materials, finely mixed powders of desired proportions are calcined at temperatures ranging from 650 degrees C to 1000 degrees C. Then cores are pressed from these powders to densities of approximately 2.5 to 3.5 grams per cc and sintered at temperatures ranging from 1100 degrees C to 1400 degrees C for time intervals ranging from thirty minutes to several hours. After sintering, the cores are furnace cooled to approximately 900 degrees C and then metal plate quenched to room temperature.

The range of constituents, in mol percent by weight, are: 30 to 45 percent Fe(2)O(3), 0 to 46 percent MnCO(3), 5 to 30 percent Li(2)CO(3), and 10 to 35 percent of an oxide of a tetravalent metal such as TiO(2). Oxides of other tetravalent metals such as silicon, tin and zirconium may be used in place of titanium oxide.

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