Fe-based amorphous alloy ribbon and magnetic core formed thereby

Inactive Publication Date: 2006-01-05
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Accordingly, an object of the present invention is to provide an Fe-based amorphous alloy ribbon having improved saturation magnetic f

Problems solved by technology

Though silicon steel has a high magnetic flux density with low cost, it disadvantageously suffers from a core loss in high-frequency applications.
They also have large magnetostriction, vulnerable to the deterioration of characteristics due to stress.
However, the above conventional Fe-based amorphous alloy ribbons are not suitable as magnetic core materials for transformers because of low magnetic flux densities.
Because a low magnetic flux density necessitates a low maximum operation magnetic flux density, the magnetic core having a low magnetic flux density inevitably has large volume or weight.
Th

Method used

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  • Fe-based amorphous alloy ribbon and magnetic core formed thereby
  • Fe-based amorphous alloy ribbon and magnetic core formed thereby
  • Fe-based amorphous alloy ribbon and magnetic core formed thereby

Examples

Experimental program
Comparison scheme
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Example

[1] Composition

[0022] The first Fe-based amorphous alloy of the present invention is represented by the general formula: FeaSibBcMx, wherein M is Cr and / or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, and x is 0.01 to 5 atomic %, (a+b+c+x) being 100.

[0023] The second Fe-based amorphous alloy of the present invention is represented by the general formula: FeaSibBcCdMx, wherein M is Cr and / or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, d is 0.001 to 4 atomic %, and x is 0.01 to 5 atomic %, (a+b+c+d+x) being 100.

[0024] When the Fe-based amorphous alloy of the present invention containing Cr and / or Ni is used, stress generated at the time of producing a magnetic core is sufficiently relaxed by a heat treatment. Cr functions to provide the alloy with a reduced melt viscosity, and improved wettability with a roll and surface conditions. Cr and Ni also have an effect of accelerating the relaxation of stress in the Fe-base...

Example

EXAMPLE 1

[0036] Alloy melts having compositions represented by FeaSibBcMx (a+b+c+x=100) as shown in Table 1 were rapidly quenched by a single roll method to produce amorphous alloy ribbons of 5 mm in width and 25 μm in thickness.

[0037] Each Fe-based amorphous alloy ribbon was wound to form a toroidal magnetic core of 19 mm in outer diameter and 15 mm in inner diameter, which was heat-treated in an Ar gas atmosphere. During the heat treatment, a magnetic field of 1 kA / m was applied in a direction aligned with the magnetic path of the core, and the temperature was elevated to an optimum heat-treating temperature between 320° C. and 370° C., at which the highest saturation magnetic flux density and other soft magnetic properties were obtained, over 2 hours, kept at each heat-treating temperature for 1 hour, and then cooled to 200° C. over 1 hour. The heat-treated ribbons were mostly amorphous. The resultant toroidal magnetic cores were measured with respect to a saturation magnetic f...

Example

EXAMPLE 2

[0043] 20 Samples 2-1 to 2-11 and 2-12 to 2-16 of various compositions were produced and heat-treated in the same manner as in Example 1. The core loss increase ratio Wr of each resultant Fe-based amorphous alloy ribbon is shown in Table 2 together with a composition, a heat treatment temperature, a saturation magnetic flux density Bs, a stress relaxation rate Rs, an average surface roughness Ra, and a space factor. The saturation magnetic flux density Bs and the stress relaxation rate Rs were measured in the same manner as in Example 1.

[0044] The core loss increase ratio Wr is a parameter expressing an increase ratio of the core loss when the operating magnetic flux density increases from 1.3 T to 1.4 T, which is represented by the following equation:

Wr=(W14 / 50−W13 / 50) / W13 / 50×100 [%]  (2),

wherein W13 / 50 represents a core loss at a magnetic flux density of 1.3 T and a frequency of 50 Hz, and W14 / 50 represents a core loss at a magnetic flux density of 1.4 T and a freque...

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Abstract

A magnetic core provided with a shape for a transformer by a cut-lap or step-lap method, which is constituted by an Fe-based amorphous alloy ribbon having excellent magnetic characteristics, which is represented by the general formula: FeaSibBcMx or FeaSibBcCdMx wherein M is Cr and/or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, x is 0.01 to 5 atomic %, and d is 0.001 to 4 atomic %, (a+b+c+x) or (a+b+c+d+x) being 100.

Description

FIELD OF TH INVENTION [0001] The present invention relates to an Fe-based amorphous alloy ribbon having excellent magnetic properties, and a magnetic core constituted by such an Fe-based amorphous alloy ribbon, and particularly to an Fe-based amorphous alloy ribbon and its magnetic core usable for various transformers, reactors, noise reduction parts such as choke coils for active filters, smoothing choke coils, common-mode choke coils, etc., laser power supplies, magnetic pulse power parts of accelerators, motors, generators, etc. BACKGROUND OF THE INVENTION [0002] Known as magnetic alloys having high saturation magnetic flux densities and low core losses used for various transformers and reactors, noise reduction parts such as choke coils for active filters, smoothing choke coils, common-mode choke coils and electromagnetic shields, laser power supplies, magnetic pulse power parts of accelerators, motors, generators, etc. are silicon steel and Fe-based amorphous alloys. Though sil...

Claims

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Application Information

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IPC IPC(8): C22C45/02
CPCH01F1/15308H01F3/14H01F3/04
Inventor NAOE, MASAMUOGAWA, YUICHIYOSHIZAWA, YOSHIHITO
Owner HITACHI METALS LTD
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