Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-11-04
1993-10-12
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148122, H01F 100
Patent
active
052521443
ABSTRACT:
The present invention relates to a novel heat treatment process, and the alloy products produced thereby. The heat treatment process includes heating an alloy at a temperature and for a time sufficient to cause crystallization, cooling the alloy at a rate greater than about 10.degree. C. per minute, preferably greater than about 50.degree. C. per minute, and most preferably greater than about 100.degree. C. per minute. Alloys of many compositions and having either amorphous, surface crystallized or partially bulk crystallized structure may be beneficially treated. Alloy strips and cores heat treated according to the present invention display B-H loops which display a discontinuous change in slope at near zero field conditions. Alloy strips which have been heat treated according to the present invention display greatly increased resonant output voltages and are particularly useful as resonant markers in article surveillance systems. Cores which have been heat treated according to the present invention display constant permeabilities up to about 1 MHz and are particularly useful as EMI filters and high frequency transformers.
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Allied Signal Inc.
Brown Melanie L.
Fuchs Gerhard
Harding Karen A.
Sheehan John P.
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