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Iron-based high saturation induction amorphous alloy

a high saturation, amorphous alloy technology, applied in the direction of transformer/inductance magnetic core, magnetic material, magnetic body, etc., can solve the problem of high cost, significant loss of magnetic flux or induction in the air gap between the rotor, etc. problem, to achieve the effect of low ac magnetic loss

Inactive Publication Date: 2006-08-17
METGLAS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In accordance with aspects of the invention, an amorphous metal alloy has a composition having a formula FeaBbSicCd where 80<a≦84, 8≦b≦18, 0<c≦5 and 0<d≦3, numbers being in atomic percent, with incidental impurites. When cast in a ribbon form, such an amorphous metal alloy is ductile and thermally stable, and has a saturation induction greater than 1.6 T and low AC magnetic loss. In addition, such an amorphous metal alloy is suitable for use in electric transformers, pulse generation and compression, electrical chokes, energy-storing inductors and magnetic sensors.

Problems solved by technology

In motors and generators, a significant amount of magnetic flux or induction is lost in the air gap between rotors and stators.
Low AC magnetic losses are also necessary if a sensor device is operated at high frequencies.
% Co and therefore too expensive to be utilized in commercial magnetic products such as transformers and motors.
These alloys were found mechanically too brittle to be practically utilized.

Method used

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  • Iron-based high saturation induction amorphous alloy
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Examples

Experimental program
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Effect test

example i

[0032] About 60 kg of the constituent metals, such as FeB, FeSi, Fe and C, were melted in an crucible and the molten metal was rapidly solidified by the method described in the U.S. Pat. No. 4,142,571. The ribbon formed had a width of about 170 mm and a thickness of about 25 μm and was tested by a conventional differential scanning calorimetry to assure its amorphous structure and determine the Curie and crystallization of the ribbon material. A conventional Archimedes' method was used to determine its mass density, which was needed for material's magnetic characterization. The ribbon was found ductile.

example ii

[0033] The 170 mm wide ribbon was slit into 25 mm wide ribbon which was used to wind toroidally shaped magnetic cores weighing about 60 gram each. The cores were heat-treated at 300-350° C. with a DC magnetic field of about 20 Oe (1600 A / m) applied along the toroid circumference direction. A primary copper wire winding of 10 turns and a secondary winding of 10 turns were applied on the heat-treated cores for magnetic measurements.

example iii

[0034] The magnetic characterizations of the heat-treated magnetic cores with primary and secondary copper windings of Example II were performed by using commercially available BH loop tracers with DC and AC excitation capability. AC magnetic characteristics, such as core loss, were examined by following ASTM A912-93 Standards for 50 / 60 Hz measurements.

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Abstract

An iron-based amorphous alloy and magnetic core with an iron-based amorphous alloy having a chemical composition with a formula FeaBbSicCd, where 80<a<=84, 8<=b<=18, 0<c<=5 and 0<d<=3, numbers being in atomic percent, with incidental impurities, simultaneously having a value of a saturation magnetic induction exceeding 1.6 tesla, a Curie temperature of at least 300° C. and a crystallization temperature of at least 350 ° C. When cast in a ribbon form, such an amorphous metal alloy is ductile and thermally stable, and is suitable for various electric devices because of high magnetic stability at such devices' operating temperatures.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to an iron-based amorphous alloy with a saturation induction exceeding 1.6 Tesla and adapted for use in magnetic devices, including transformers, motors and generators, pulse generators and compressors, magnetic switches, magnetic inductors for chokes and energy storage and sensors. [0003] 2. Description of the Related Art [0004] Iron-based amorphous alloys have been utilized in electrical utility transformers, industrial transformers, in pulse generators and compressors based on magnetic switches and electrical chokes. In electrical utility and industrial transformers, iron-based amorphous alloys exhibit no-load or core loss which is about ¼ that of a conventional silicon-steel widely used for the same applications operated at an AC frequency of 50 / 60 Hz. Since these transformers are in operation 24 hours a day, the total transformer loss worldwide may be reduced considerably by using these m...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C45/02
CPCC22C33/003C22C45/02H01F1/15308H01F1/15333H01F27/33H01F27/25H01F41/0226
Inventor HASEGAWA, RYUSUKEAZUMA, DAICHIYOSHIZAWA, YOSHIHITOOGAWA, YUICHI
Owner METGLAS INC
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