JPS60145360A - Amorphous magnetic alloy and its manufacture - Google Patents

Abstract

PURPOSE:To obtain an amorphous magnetic alloy having a low magnetic flux density in a high frequency region and a small iron loss by scratching a thin strip of an amorphous mangetic Fe-Cr-B-Si alloy. CONSTITUTION:An amorphous thin strip 1 having a composition represented by the formula (where w, x, y and z are atom% of each element, w=60-85, x=4- 10, y=10-20, z<=10, and x+y<=25) is scratched 2, and the scratched strip 1 is heat treated at a temp. between the Curie temp. and the crystallization temp. By this method an amorphous magnetic alloy having a low magnetic flux density in a high frequency region and a smaller iron loss than a conventional magnetic material can be obtd.

Description

[Detailed description of the invention] 〔Technical field〕 This invention applies to high frequency areas (especially 10 KHz or higher).

The present invention relates to an amorphous magnetic alloy that can be used as a magnetic core material with low operating magnetic velocity density (especially 3 K Gauss or less) and low core loss, and a method for manufacturing the same.

[Background technology]

Currently, research into amorphous magnetic cores as a magnetic core material for high-frequency applications is underway as an alternative to conventional soft ferrite. It is known that amorphous magnetic cores have a high saturation magnetic flux density and are advantageous compared to ferrite at high operating magnetic flux densities. However, as the operating frequency increases, iron loss increases rapidly in proportion to the frequency and the square of the operating magnetic flux density, so use is limited to relatively low operating magnetic flux densities, and the high saturation flux severity of amorphous is unavoidable. However, it was not advantageous compared to conventional ferrite.

On the other hand, as a means for reducing high frequency iron loss in amorphous materials, there is a method to precipitate a fine crystalline phase by heat treatment as disclosed in JP-A No. 57-94554, and a method disclosed in JP-A No. 57-94554.
It is known that magnetostriction can be reduced by adding a non-magnetic metal as disclosed in Japanese Patent No. 7-169068. however,
These methods were not necessarily advantageous at low magnetic flux densities.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an amorphous magnetic alloy with high frequency range, low operating magnetic flux density, and low iron loss, and a method for manufacturing the same.

[Disclosure of the invention]

The amorphous magnetic alloy of this invention has the formula: % formula % (where w, x, y, z are the atomic ratios of each element, where W is 60 to 85, X is 4 to 10, y is 10 ~20
The present invention is characterized in that an amorphous magnetic ribbon having a composition in which ゜2 is 10 or less and y+z is 25 or less is subjected to scratch processing.

Further, in the method for producing an amorphous magnetic alloy of the present invention, an amorphous magnetic ribbon having the above composition is subjected to scratch processing, and then heat-treated at a temperature below the crystallization temperature and above the Curie temperature.

In this way, Sukura/Sochi processing is applied to amorphous W magnetic ribbon.
As a result, iron loss can be reduced with a relatively low auxiliary magnetic flux density.

It has been known before this application that iron loss is reduced when a magnetic material is subjected to SCR/Sochi processing, such as the high frequency material Fe79B processing disclosed in Japanese Patent Publication No. 57-94554. Even if the scratch distance is reduced by -1 to Si5, the iron loss will not be reduced for a long time. This is Fe,,9B
Yo. In Si5, a crystal phase is precipitated by heat treatment, so
This is given because the contribution to reducing iron loss is greater than the effect of reducing iron loss due to changes in magnetic domain structure due to scratching. On the other hand, in the alloy of the present invention, the scratching effect appears because almost no crystalline phase is precipitated by heat treatment below the crystallization temperature. Of course, even with other peusi-based ammonium/L'7 ryosu, the crystal phase is precipitated and the iron loss region 71) effect due to scratching is seen in the heat treatment, but the absolute value of iron loss is still large.

Next, a more detailed explanation will be given with reference to Examples and Comparative Examples.

Examples 1 to 5: 25 to 30 μm thick alloys having the respective compositions shown in Table 1 were made by a single roll method in the air.

Amorphous ribbons each having a width of 1 cWI were produced. This was cut into a length of 1.5 m, and scratches 2 were made on both sides of the ribbon 1, that is, on the free surface 3 and on the roll surface 4, as shown in FIGS. 1 and 2 using a knife.

The scratches 2 are approximately perpendicular to the length of the ribbon, and the distance d between the scratches is approximately 0.5 m. A core with an inner diameter of 2 was prepared using this ribbon 1, and heat treated for 60 minutes in a nitrogen atmosphere. In addition, a core of the same shape was made from a thin ribbon that was not scratched, and was heat-treated in the same way, and compared with a core that had been subjected to scratching. After heat treatment, using a U function needle, 50 KHz, I K Gauss
The iron loss was measured and the results are also shown in Table 1. In addition,
The warm heat treatment shown in Table 1 is the temperature at which iron loss is minimized when the heat treatment is performed in steps of 10° C. below the crystallization temperature.

Comparative Examples 1 to 5: Cores were produced in the same manner as Examples 1 to 5, except that alloy (5) and ferrite having the respective compositions shown in Table 1 were used. These iron loss measurement results are also shown in Table 1.

(6) From Table 1, it can be seen that the core loss of each of the magnetic cores shown in Examples 1 to 5 is reduced by scratching. Further, even when the magnetic cores shown in Comparative Examples 1 to 5 are subjected to scratch processing, the iron loss is not significantly reduced, and the iron loss remains at a high value.

〔Effect of the invention〕

According to the present invention, it is possible to obtain an amorphous magnetic alloy having lower iron loss than conventional magnetic materials at high frequency and low magnetic flux density.

[Brief explanation of drawings]

FIG. 1 is a plan view of a thin ribbon obtained in an example of the present invention, and FIG. 2 is a cross-sectional view taken along a T-line. 1...Thin strip, 2...Scratch (7) Figure 2 Procedures Neho Seisho (Volunteer 1, Incident Indication 1159 Patent Application No. 003-205 2, Name of Invention Amorphous Magnetic Alloy and its manufacturing method 3, the person making the amendment Relationship with the case (2) In Table 1 on page 6 of the specification, the composition of Example 3 is rFe7zcs B+eS is J.
Corrected as tzcr5B+sS 45 J. (2)

Claims (2)

[Claims] (1) Formula: %Formula% (In the formula, w, x, y, z are the atomic ratios of each element, W is 60-85.X is 4-10.y is 10-20゜2 is 10
1. An amorphous magnetic alloy characterized by scratch-processing an amorphous magnetic ribbon having a composition (hereinafter, y+z is 25 or less). (2) Formula: % Formula % (In the formula, w, x, y, z are the atomic ratios of each element, W is 60-85.y is 4-10.y is 10-2
0°2 is 10 or less and y+z is 25 or less) is subjected to scratch processing, and then heat treated at a temperature below the crystallization temperature and above one Curie temperature. A method for producing an amorphous magnetic alloy.