US 5,494,534 AGranted

Method of heat treating an amorphous soft magnetic article

AssigneeIndustrial Technology Research Institute

InventorMing-Sheng Leu

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Abstract

Two-stage heat treatment is used to improve the initial permeability and core loss of a soft amorphous magnetic article. The first-stage heat treatment is performed at a temperature less than the curie temperature of the amorphous soft magnetic article by 0.degree.-50.degree. C. for 0-10 hours, while applying a static magnetic field which is larger than 1000 Oe in a first direction which is generally perpendicular to the direction the magnetic article is to be magnetized when used or measured. The second-stage heat treatment is performed at a temperature less than the crystallization temperature of the amorphous soft magnetic article by 0.degree.-100.degree. C. for 0-10 hours, while applying a static magnetic field which is between 50 Oe and 1000 Oe in the first direction. Prior to performing the second-stage heat treatment, the temperature is lowered to room temperature.

Claims11

Dependent claims

A method of heat treating an amorphous soft magnetic article, comprising

(a) performing a heat treatment at a first temperature which is equal to or less than the Curie temperature of said amorphorous soft magnetic article said first temperature being 0.degree. C.-50.degree. C. less than the Curie temperature, said heat treatment being performed for not more than 10 hours, said heat treatment occurring while applying a static magnetic field which is larger than 1,000 Oe in a first direction which is perpendicular to the direction the amorphous soft magnetic article is to magnetized when used or measured;
(b) cooling to room temperature at a rate less than 20.degree. C./min;
thereafter
(e) performing a heat treatment at a second temperature equal to or less than the crystallization temperature of said amorphous soft magnetic article said second temperature being 0.degree. C. to 100.degree. C. less than the crystallization temperature, said heat treatment being performed for not than more than 10 hours, said heat treatment occurring while applying a static magnetic field which is between 50 Oe and 1000 Oe in said first direction;
and
(d) cooling to room temperature.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/406,063Filed 17 Mar 1995
Granted: 27 Feb 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C22F 1/10
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working: of nickel or cobalt or alloys based…
C21D 1/04
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering: with simultaneous application of supersonic…
H01F 1/15341
Amorphous metallic alloys, e.g. glassy metals: preparation processes therefor
C22F
Changing the physical structure of non-ferrous metals and non-ferrous alloys