JPS59157258A - Amorphous magnetic material - Google Patents

Abstract

PURPOSE:To provide an amorphous magnetic material suitable in an application such as a flexible type rolled core or the like which has the decreased deterioration in the square hysteresis characteristic when strained and is to be subjected to molding strain for the purpose of rolling by performing baking in a specific temp. range. CONSTITUTION:An Fe or Fe-Ni amorphous ribbon having a prescribed thickness and width is manufactured by a quick cooling method for a molten metal using a single roll and such ribbon is molded to a troidal-rolled core. The core is baked in a temp. range of 260-390 deg.C and is then unrolled and thereafter the core is rolled again to form a troidal-rolled core. In other words, the core is rolled again after the rolling strain is applied thereon. The rerolled troidal-rolled core shows an increase in magnetic flux density as shown by B1, B10 and in squareness ratio as shown by Br/B1. The coercive force Hc which is the characteristic of an amorphous magnetic material is small in this range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a heat treatment method for improving the magnetic properties of an amorphous magnetic material.

[Prior art]

NA'L, which is a Fe-Ni alloy (NOKUMAROY), is used as a magnetic core material used in magnetic phase shifters, magnetic amplifiers, and the like. Since permalloy has poor magnetic properties in its as-rolled state, it is usually heat-treated before use.

However, the magnetic properties obtained by heat treatment have the disadvantage that they deteriorate significantly when strain is applied. From this,
The structure shown in FIG. 1 was used as a Malloy all-magnetic core I2 material. That is, a thin plate is wound into a toroidal shape, then heat treated, and the permalloy-wound magnetic core 1 is placed in a case 2 to prevent distortion from being applied to the magnetic material during subsequent handling, filled with a buffer 3 such as silicone oil, and then permalloy-wound. Be very careful not to strain the magnetic core.
It has been used and paid for.

Materials whose magnetic properties change sensitively due to strain must be protected and fully usable in practical use, which limits their application, and their use is fraught with potential causes of high costs. Recently, amorphous magnetic materials produced by molten metal quenching have appeared as new magnetic material thin plates to replace Fe-Ni alloys, and among them, Fe or pe-Ni, which have all the characteristics of high magnetic flux density, high squareness ratio, and low coercive force, have appeared. There are amorphous magnetic core materials. Amorphous magnetic materials have less strain sensitivity than crystalline permalloy. When using an amorphous magnetic alloy ribbon as a reactor by taking full advantage of its low strain sensitivity, the purpose can be achieved by winding the ribbon in a straight ring in a straight line and wrapping the entire amorphous ribbon around this @ wire. .

It has not been known that there is a heat treatment method suitable for the use of PE or PE-Ni amorphous magnetic alloys which are subjected to molding distortion during winding as described above.

[Purpose of the invention]

An object of the present invention is to provide a heat treatment method that is suitable for using an amorphous ribbon in a state where molding distortion is applied to the winding stop.

[Summary of the invention]

The present invention is particularly concerned with a method of manufacturing an amorphous ribbon for use in reactors with closed di-paths. A reactor with a closed magnetic path is widely used as a basic component of transformers, current transformers, magnetic amplifiers, etc. In particular, if the reactor is configured with a toroidal wound magnetic core with no gaps in the magnetic path, the excitation current will be reduced, making it possible to realize high-performance transformers, current transformers, magnetic amplifiers, etc.

[Embodiment of the Invention] FIG. 2 shows the structure of a flexible wound magnetic core using an amorphous ribbon according to an embodiment of the present invention. This is because the amorphous ribbon made by the bath water quenching method does not deteriorate its magnetic properties even if it is deformed to the extent of winding. Taking advantage of this, an amorphous magnetic alloy ribbon is placed in a pre-prepared coil, contrary to the conventional method. The entire magnetic core was made by winding the .

FIG. 3 shows the structure of an inner pot/outer iron type reactor using an amorphous ribbon, which is another embodiment of the present invention. This makes it possible to create a reactor with a small excitation current and high productivity. In these embodiments, the performance of the reactor varies depending on the excitation current characteristics, but a desirable characteristic is that the excitation current can be suppressed to a low level up to a high excitation voltage.

Let me add a little additional explanation to what good excitation current characteristics are. In the principle circuit diagram of a transformer as shown in FIG. 4, coil 1 and coil 2 are coupled via a magnetic core 3. In FIG. When an alternating current of 1] flows through the primary coil with Nl turns, it is the voltage input to the path, and R1 is the value of the primary coil.

In such voltage transformer applications, a magnetic core is desired that produces a large magnetic flux change with a small excitation current (11), thus resulting in large 1 and V2. Problems in such foundation stones are obtained in the case of total magnetic material type ratio, magnetic properties of low coercive force. From this point of view, in the following explanation, the magnetic properties of the material (magnetic flux density, squareness ratio, and coercive force) will be discussed.

Manufacturing conditions such as tri-molten metal ejection temperature, pressure, and roll rotation speed affect the magnetic properties of amorphous li-bon produced by the roll quenching method, and the above-mentioned high magnetic flux density, high kakuya ratio, and low coercive force magnetic properties are obtained. has optimal conditions. Generally, amorphous ribbons are manufactured under the best conditions for both surface properties and magnetic properties of the ribbon. l?
Unlike the Co-based amorphous ribbon, the 'e or Fe-Ni amorphous ribbon has a magnetostriction coefficient of 30x'1O.
There is a problem in that the ribbon has uniaxial anisotropy due to the tension in the longitudinal direction of the ribbon, which is as large as about -6. That is, the strain applied to the ribbon during rapid cooling in the bath water produces anisotropy, which produces square hysteresis characteristics in the longitudinal direction of the ribbon. However, it is also known that such custom-made square hysteresis can be improved to a considerable degree by heat treatment. That is, by applying tension in the longitudinal direction of the ribbon or applying a magnetic field in the longitudinal direction of the ribbon and baking at a temperature below the magnetic transformation point of the material (Ak), the "square hysteresis" characteristic can be improved. Although there are some differences depending on the alloy composition, the optimum temperature for such heat treatment is 40°C for Fe or Pe-Ni amorphous magnetic alloys.
It is near 0C. However, the rectangular hysteresis characteristic obtained in this way has the disadvantage that it is greatly impaired by distortion due to the winding. Not suitable for use in reactors. Therefore, we searched for a heat treatment that would not impair the magnetic properties of the amorphous ribbon by winding it after the heat treatment, and searched for a heat treatment method that would give the amorphous ribbon even better magnetic properties.

Hereinafter, the invention will be explained according to embodiments.

Example 1 Thickness 20 μm 1 width 5 by rapid cooling of molten metal using one roll
I made all the pant ribbons. Alloy composition is FeNia3 in atomic%
．． Ni8. Si210. I3: (3.

This ribbon was then molded into a full toroidal wound core. The inner diameter of the wound core was 25 m, and the outer diameter was 35 mm.

The toroidal wound core produced in this way is 210 ~
Baking was performed at 390C for 0.5h. The wound core was then unraveled and re-wound to form a toroidal wound core. In other words, the core was re-formed by applying distortion to the winding. In molding the wound core, a winding tension of 200 g was applied to the ribbon. FIG. 5 shows the magnetic properties obtained in this manner, arranged on the horizontal axis of the initial heat treatment temperature.

What is noteworthy about the magnetic properties of the re-wound toroidal core is the magnetic flux density Bl + due to baking at 260-360C.
Bla and the squareness ratio Br'/Bt are increased by 11.

In addition, in this range, the coercive force f(c), which is a characteristic of the amorphous magnetic 1 raw material, is small. 1. Baking at 260 to 360 U clearly improves the squareness ratio compared to no heat treatment.

Example 2 A ribbon with a thickness of 30 μm and 19 halves and 5 ribbons was produced by a single roll quenching method. Alloy composition (, is Fe in atomic %; 78+
Si;9+B;13. This ribbon was then molded into an itroidal wound core. The toroidal goodness core prepared in this way was 0 to 210 to 440 CCO.
．． I did two 5 hour baking sessions. The metal scraps from the wound core were loosened, and this was re-wound to form a toroidal wound core. At this time, the ribbon was molded with a winding tension τ of 200 g. What are the magnetic properties when done this way? The initial heat treatment temperature (i: plotted as the horizontal axis is shown in Figure 6.The magnetic properties of the re-wound toroidal core are notable for the
~Magnetic flux density BI + BIO by 390C baking
and the increase vO of the squareness ratio B r/B. Furthermore, within this range, a small coercive force, which is a feature of amorphous magnetic materials, can be obtained, and the magnetic properties are improved by baking at 260 to 390 C compared to those without heat treatment.

Example 3 A flexible wound Ib gold ribbon as shown in FIG. 2 was prepared using a ribbon without heat treatment and a ribbon with heat treatment, and the phase shift characteristics thereof were compared. In fact, the results are shown in Figure 7. Is it true with heat treatment? This is a case in which a ribbon baked at 310C with an alloy of 1i is used, and the case without heat treatment is a case in which a rapidly cooled ribbon is used. As a characteristic of the magnetic phase shifter, it is desirable that the rising slope of the curve is large and the straight line portion thereof is wide.

The magnetic phase shifter characteristics of the heat-treated one are superior to those without heat treatment.

An inner pot and outer iron type actuator using an outer Hvc amorphous magnetic ribbon as shown in FIG. 3 was prepared.

Two types of ribbons were used: one made of the alloy of Example 20 and one baked at 3300 for 1 hour and the other without heat treatment. Figure 8 shows the excitation current characteristics. With heat treatment, the excitation current was kept low up to a high excitation voltage, and the linearity of the excitation quasi-current characteristics was better, and the effect of baking at 330C before winding was recognized.

〔Effect of the invention〕

Generally, the magnetic properties of magnetic materials change when strain is applied to them, but amorphous magnetic materials cannot escape from this category. However, the amorphous magnetic material that has been properly baked as described in the present invention has a small deterioration of the square hysteresis characteristics when strain is applied, and is suitable for flexible winding magnet 'Llz inner copper which is subjected to molding distortion for winding. Suitable for use in external copper and external iron type reactors. These magnetic components have low excitation current and loss, and are highly productive, so they are used in high-performance transformers,
Used in current transformers, magnetic amplifiers, etc.

[Brief explanation of drawings]

Figure 1 is a structural diagram of conventional permalloy etc.
The figure is a structural diagram of a flexible winding magnet using an amorphous ribbon according to one embodiment of the present invention, and Figure 3 is an example of the invention.
Fig. 4 is a structural diagram of a Pyoshio-gai-type reactor using an additional amorphous ribbon. A diagram showing the relationship between annealing temperature and magnetic properties of Fe-Nr based amorphous magnetic material, FIG. 7 is a characteristic curve diagram of a magnetic phase shifter according to an embodiment of the present invention, and FIG. 8 is an excitation diagram according to an embodiment of the present invention. I
It is an E flow% box diagram. 1...Shaji'IJz 2...Case, 3...Buffer. Agent Patent Attorney Meidai Takahashi 1st side Figure 2 Cb) Bahenfu & 2 nights (0Q small baking sheet transfer (0c) Control electric washing 1a (fn-A)

Claims (1)

[Claims] 1.39 (An amorphous magnetic material characterized by being baked at 1' or less and 260C or more.