JPH03180425A - Method for improving magnetic permeability characteristic - Google Patents

Abstract

PURPOSE:To improve magnetic permeability characteristics by subjecting a ribbon formed of an amorphous magnetic alloy with a specific composition or a laminated body of the above ribbon to annealing in an oxidizing atmosphere. CONSTITUTION:A magnetic ribbon formed of an amorphous magnetic alloy or a laminated body of this ribbon is annealed in an oxidizing atmosphere to remove mechanical strain, by which magnetic permeability can be improved. This method is effective for an amorphous alloy represented by FeaXbYcSidBeCf. In the above compositional formula, the symbols (a), (b), (c), (d), (e), and (f) stand for 35-85%, 0-45%, 0-10%, 0-15%, 5-25%, and 0-5%, by atom, respectively. Further, X means either or both of Co and Ni, and Y means transition metal, such as Mo, Cr, Nb, and Mn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] Sixth aspect of the present invention relates to improvement of magnetic permeability properties in processing magnetic materials.

[Conventional technology]

Traditionally, 69 ferrite has been commonly used as a magnetic core material, but 82 ferrite has the drawback of low saturation magnetic flux density and low Curie temperature, so in recent years, amorphous materials that do not have these drawbacks have been It is known to use magnetic materials such as

By the way, when a core is formed from a magnetic ribbon made of such an amorphous magnetic alloy and used for a noise filter or the like, it is desired that the magnetic permeability characteristic is as good as possible in a high frequency region.

[Problem to be solved by the invention]

The present invention IL was developed against this background, and an object of the present invention is to provide a method for processing a magnetic material that can improve magnetic permeability characteristics.

Incidentally, although not related to this improvement in magnetic permeability characteristics, there are methods described in Japanese Patent Laid-Open No. 194117/1982 and Japanese Patent Publication No. 34781/1983 as a method for obtaining a magnetic core material with low iron loss in a high frequency region.

The former is based on the idea that by heat-treating an iron-based amorphous alloy with a high chromium content (3 to 1,000%) in a strongly oxidizing atmosphere, it is possible to obtain a magnetic core material with low core loss in the high frequency range. Are listed.

It is also stated that a small residual magnetic susceptibility and low iron loss characteristics can be obtained by heat-treating a soft magnetic amorphous alloy in the atmosphere.

As mentioned above, the main purpose of both of them is to improve the iron loss characteristics, and there has been no initial study on improving the magnetic permeability characteristics.In addition, there is no guarantee that improving the iron loss will immediately lead to an improvement in the magnetic permeability. .

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention takes the following technical means into consideration. That is, the method of the present invention uses a magnetic ribbon made of an amorphous magnetic alloy or a laminate thereof. This is a method for improving magnetic permeability characteristics characterized by improving the magnetic permeability of a magnetic ribbon or a laminate thereof by annealing in an oxidizing atmosphere to remove mechanical strain.

[Effect]

In the present invention, by annealing a magnetic ribbon made of an amorphous magnetic alloy or a laminate thereof in an oxidizing atmosphere,
The magnetic permeability of the magnetic ribbon or its laminate can be improved by some action. In addition, annealing releases internal stress that remained during manufacturing of the amorphous magnetic alloy ribbon.

In the present invention, a magnetic ribbon made of an amorphous magnetic alloy or a laminate thereof is subjected to annealing.

Here, the magnetic ribbon in the present invention (thickness: 5 μm)
It is formed of a ribbon made of an amorphous magnetic alloy having a thickness of about 100 μm and having the above compositional formula.

Laminated body 1 roll Multiple layers of magnetic ribbons, or L
It is made by winding a long magnetic ribbon.

These are used as magnetic cores.

An example of an amorphous magnetic alloy forming the magnetic ribbon or laminate thereof to be annealed in the present invention)! , Fe-B,
Fe-B-C, Fe-B-3i, Fe-B-5
i-C, Fe-B-Si-Cr, Fe-Co-B-3
i Fe-nail Co-B such as Fe-Ni-Mo-B,
Co-Fe-5i-B, Co-Fe-Ni-
Mo-B-5i, Co-Fe-Ni-B-3i
, Co-Fe-Mn-B-Si, Co-Fe-
Mn-Ni, Co-Mn-Ni-B-3i,
Examples include Co-based amorphous magnetic alloys such as Co-Fe-Mn-N1-B.

In particular, it is most effective when an amorphous magnetic alloy having the composition of formula (A) below is selected.

Fe, XbY, S t, B, cl (A) [In the above compositional formula (A), a, b, c, d, e,
f is atomic % and is expressed as 35≦a≦85 0≦c≦10 5≦e≦25, and X is C.

O≦b≦45 0≦d≦15 0≦f≦5 lfi selected from Ni alone or a combination of two elements, Y is Mo.

It is a transition metal element such as Cr, Nb, Mn, etc.] Here, C
is 5 or less, more preferably 3 or less.

In the present invention, for example, an amorphous magnetic alloy having a purity of at least 98% by weight is preferably an amorphous alloy represented by the above compositional formula.

A magnetic ribbon made of such an amorphous magnetic alloy or a laminate thereof is annealed in an oxidizing atmosphere.

The annealing temperature is preferably 300 to 600°C.

The term oxidizing atmosphere here refers to an atmosphere formed by a mixed gas of air and an inert gas, an inert gas containing moisture, etc. In such an oxidizing atmosphere, it is not necessarily formed throughout the furnace. It is not necessary that the surface of the magnetic ribbon be filled with the magnetic ribbon. What does it mean to say that the surface of the magnetic ribbon is filled with an oxidizing atmosphere? What happens when the ribbon is placed in air or oxygen gas? Includes aspects such as attaching a powdered oxidizing agent, such as diantimony pentoxide, to the magnetic ribbon. .

Also, during this annealing &; - as is known in boat fishing &;
By applying a magnetic field in the width direction of the magnetic ribbon, even better magnetic permeability characteristics can be obtained.

〔Example〕

The present invention will be explained in detail below.

First, as shown in Fig. 5, a magnetic ribbon (1) is sequentially fed through rollers (2), wound and laminated while applying tension at the final stage, and an amorphous magnetic core (3) of the same size is formed. A plurality of magnetic cores were formed, each of which was annealed in an oxidizing atmosphere.
[Example 1] (a) Composition of amorphous metal; Fe, B, Si, at, % (b) Magnetic core: The above magnetic ribbon was wound. Toroidal core inner diameter = 2
3mm Outer diameter = 37mm Height = 15mm Mass = 63g Space factor = AS, 7% (Ratio of ribbon to total volume) (c) Annealing conditions: Annealing temperature = 400℃ Heating time = 6 hours Atmosphere = Air ( e) Results Measurement Magnetic field: At 5 m0e, the magnetic permeability characteristics shown in Fig. 1 were obtained [Example 2] (a) Composition of amorphous metal; F evt, sc O@, ssCr2B+as im,
*at,% (b) Magnetic core: Toroidal core around which the magnetic ribbon is wound; inner diameter = 23
mm Outer diameter = 370111 Height 1511101 Mass = 62g Space factor = 86.5% (Ratio of ribbon to total volume) (e) Annealing conditions Annealing temperature = 420°C Heating time 22 hours Atmosphere = Air (e) Results At a measured magnetic field of 5a+Oe, the magnetic permeability characteristics shown in Figure 2 were obtained. [Comparative Example 1] (a) Composition of amorphous metal: Fet*B, ssi@at, % (b) Magnetic core : Inner diameter of toroidal core around which the magnetic ribbon is wound = 23
Outside diameter = 37a + ta Height = 1511rm Mass = 62.2g Space factor = 87.5% (Ratio of ribbon to total volume) (c) Annealing conditions Annealing temperature = 420°C Heating time 22 hours Atmosphere = Nitrogen gas In the atmosphere (e) Results Measurement At a magnetic field of 5 m0e, the magnetic permeability characteristics shown in Fig. 3 were obtained [Comparative Example 2] (a) For 1P quality metal! lor; F ell, @COs, ssCr 2Bt*SI a
, sat, % (b) Magnetic core: Inside the toroidal core around which the magnetic ribbon is wound. Diameter = 2
311I11 Outer diameter = 37mm Height = 15ms + Mass = 62g Space factor = 85.9% (ratio of ribbon to total volume) (c) Annealing conditions Annealing temperature = 435°C Heating time = 2 hours Atmosphere = Nitrogen gas (e) Result Measurement in Atmosphere: At a magnetic field of 5 m0e, the magnetic permeability characteristics shown in Figure 4 were obtained. It is clear from the comparison between Figures 2 and 4 that when a magnetic ribbon with the above composition is annealed in an oxidizing atmosphere, it is possible to obtain clearly higher magnetic permeability characteristics than when annealing in a nitrogen gas atmosphere. [Effects of the Invention] According to the present invention, magnetic permeability characteristics can be significantly improved by annealing a magnetic ribbon having a specific compositional formula in an oxidizing atmosphere.

[Brief explanation of drawings]

FIG. 1 is a graph showing changes in frequency characteristics and magnetic permeability in Example 1 of the present invention. FIG. 2 is a graph showing changes in frequency characteristics and magnetic permeability in Example 2. FIGS. 3 and 4 * indicates changes in frequency characteristics and magnetic permeability in comparative examples corresponding to these. FIG. 5 is an explanatory diagram showing a means for manufacturing a toroidal magnetic core. l...magnetic ribbon, 2...roller, 3...magnetic person 1

Claims (2)

[Claims] (1) When annealing a magnetic ribbon made of an amorphous magnetic alloy or a laminate thereof to remove mechanical strain, annealing is performed in an oxidizing atmosphere to improve the magnetic permeability of the magnetic ribbon or laminate thereof. A method for improving magnetic permeability characteristics, characterized by: (2) The amorphous magnetic alloy has the following compositional formula (A) Fe_
aX_bY_cSi_dB_eC_f [The above compositional formula (A
), a, b, c, d, e, f are respectively atomic % and are expressed as 35≦a≦850≦b≦45 0≦c≦100≦d≦15 5≦e≦250≦f≦5 , X is only one element selected from Co and Ni or a combination of two elements, and Y is Mo, Cr, Nb, M
The method for improving magnetic permeability characteristics according to claim 1, wherein the amorphous magnetic alloy is an amorphous magnetic alloy represented by the following formula: transition metal element such as n.