JPH02170950A - Amorphous magnetic alloy material - Google Patents

Abstract

PURPOSE:To obtain the subject alloy material having reduced calorific value, having improved magnetic characteristics such as magnetic permeability and drastically reduced secular change in magnetic characteristics, in a magnetic core or the like constituted of an amorphous magnetic alloy thin strip, by specifying the material compsn. and incorporating a crystalline substance thereto. CONSTITUTION:An amorphous magnetic alloy material contg. a crystalline substance and having the compsn. shown by inequality is prepd. In the above inequality, M denotes one or more kinds among transition metallic elements extruding Fe and Mn and X denotes one or more kinds among vitrifying elements extruding Si, B, P and C. Moreover, (x)+(y)+(z)=100atom%; where (y)=0.1 to 10atom% and (z)=21.0 to 25.5atom%. Furthermore, (k)+(l)=100% and (p)+(q)+(r)+(s)+(t)=100%; where (l)=0 to 10%, or (p)=40 to 75%, (r)=0.01 to 5%, s/q=0.05 to 0.4 and (t)=0 to 10%. Additionally, <=0.5p+1z, <=0.1p+19z, >=0.3p+2z and >=0.13p+13.7z are regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of this application relates to an amorphous magnetic alloy ribbon and a magnetic core for a choke coil using the ribbon.

More specifically, a current of a relatively high frequency,
Remove ripple current, on/off surge current, etc. that regularly or periodically leaks from electrical equipment, enters from the power supply side, or occurs in the circuit, and removes DC or comparative current. The present invention relates to an amorphous magnetic alloy ribbon suitable for a magnetic core for a choke coil for passing only a desired low-frequency current, and a magnetic core formed from the same.

Choke coils are used in various devices such as switching regulators, inverters such as thyristor inverters, and ordinary DC power supplies for the purpose of ripple removal, on/off surge current, etc.

Recently, it has been proposed that amorphous magnetic alloy ribbons be used as magnetic core materials for choke coils because of their excellent soft magnetic properties.

However, if you wind a normal amorphous magnetic alloy ribbon to form a magnetic core and use this as a choke coil to remove high frequency components that are constantly or periodically superimposed on DC or AC, heat generation occurs. The amount of magnetic material used in the past is too high, and the magnetic properties such as magnetic permeability are unsatisfactory, and furthermore, the magnetic permeability and iron loss deteriorate over time due to long-term repeated operation and storage. It has not yet reached the point where it has replaced raw steel sheets and ferrite.

On the other hand, by precipitating microcrystals in a ribbon of amorphous magnetic alloy,
There is a proposal to improve the υ magnetic properties by this.

However, even if such thin strips are used as magnetic cores for choke coils, the amount of heat generated, various magnetic properties,
In terms of aging characteristics, it is still insufficient as a magnetic core for choke coils.

The invention in this question was made in view of the above-mentioned circumstances, and is an amorphous magnetic alloy N? used to remove high frequency components that are stationary or periodically superimposed on direct current or alternating current. By improving the thinness used in the magnetic core for choke coils formed from E, the amount of heat generated is significantly reduced, magnetic properties such as magnetic permeability are improved, and changes in magnetic properties over time are also significantly reduced. That is its main purpose.

The inventors of the present invention have repeatedly conducted various studies for this purpose, and as a result, they have come up with the invention of this application.

That is, the first invention of this application is an amorphous magnetic alloy ribbon for a choke coil that partially contains crystals and has a composition represented by the following formula.

Further, the second invention of this application partially contains crystalline material,
This is a magnetic core for a choke coil, which is composed of a wound body formed by winding an amorphous magnetic alloy ribbon having a composition represented by the following formula.

Formula (FekMl)xMny(Si,B9PrCsX
, )2 where, in the above formula, M ld represents one or more transition metal elements other than Fe and Mn, and X represents St, B
.

Represents one or more vitrifying elements other than P and C. Also, x + y + z = 100 at %, of which y is 0.1 to 1 O at %, 2 is 21 to 25.5 a
t%. Furthermore, k+t=100%, p+ q +
r + s + t = 100%, of which t is 0 to 10%, p is 40 to 75%, and r is 0.01 to 5
%, s/q is 0.05-0.4, tFiO-10%. In addition, 2≦0.5p+1 and 2≦0.1p+
19 and 2≧0.39+2 and 2≧0.13 p+13
．． It is 7.

Hereinafter, the specific configuration of the invention of this application will be explained in detail.

The ribbon of amorphous magnetic alloy for chip coils in the first aspect of the invention partially contains crystalline material. Within the ribbon, the crystalline material partially contained in the amorphous material is generally
Microcrystals are precipitated and mixed in an amorphous substance. Therefore, when a ribbon is subjected to X-ray diffraction, the diffraction spectrum shows a zo-turn in which a peak indicating the presence of crystalline material is superimposed on a halo characteristic of amorphous material, and the diffraction image shows a Spots are superimposed on the row, and a Depay-Scherer ring with a predetermined ring diameter and ring width appears.

Then, by taking the area ratio between the halo and the peak of the diffraction spectrum, the quality of contamination and the abundance ratio of amorphous in the ribbon can be determined. The quality is usually preferably about 0.1 to 50%.

Further, the precipitated microcrystals are generally considered to have an average grain size of approximately 10 to xooo,j based on the ring diameter and ring width of the Debye-Scherer ring.

Due to these partially existing microcrystals, when a choke coil is formed from a thin ribbon, the amount of heat generated by high frequency components that are regularly or periodically superimposed on direct current or alternating current is significantly reduced. In addition, magnetic properties such as magnetic permeability are improved, and furthermore, the squareness ratio, the unsaturated region of the B-H loop, etc. can be easily adjusted, and the DC superposition characteristics are improved. In addition, deterioration of these magnetic properties over time due to long-term repeated operations and storage is also significantly reduced.

Next, to explain the composition of the amorphous magnetic alloy ribbon, in the above formula, M is a transition metal element other than Fe and Mn (Sc~znp Y -Cd rLa =
Hg, Ac-), and preferred specific examples thereof include Co + NipCr + CugM
o, Nb r Tl + W + V, Zr s
One or more of Tar Y, rare earth elements, etc. can be mentioned.

In addition, one of other vitrifying elements other than Si, B, P and C
Preferred specific examples of X representing species or more include At+
One or more types such as Be x Ge * Sb + In can be mentioned.

On the other hand, the content ytfi of Mn contained as an essential component in the ribbon is 0.1 to 10 at%, preferably 0.1 to 5
It is at%. If it is less than 0.1%, the magnetic properties of the choke coil will deteriorate significantly over time. Further, when the crystallization temperature is low and the temperature and time required for the heat treatment for precipitation of microcrystals described below are strictly limited, it becomes difficult to partially contain crystalline materials as described above. On the other hand, y is 10
If it exceeds at%, deterioration over time will be large and it will be difficult to produce a thin ribbon.

In addition, saturation magnetization decreases and DC superimposition characteristics also deteriorate. On the other hand, when y is 0.1 to 1 Oat% N, preferably 0
．． There is no such inconvenience at 1 to 5 at%.

On the other hand, the content 2 of the vitrifying element, which contains Si, B, P, and C as essential components and optionally contains one or more other vitrifying elements (X), is 21.0 to 25.5 at%. It is. Kyouji is 21. Less than Oat% or 25.5at
%, the loss is large) and the amount of heat generated by the high frequency superimposed component increases when the choke coil is configured.

In addition, 2 is 21. When the content is less than Oat%, it becomes difficult to form a thin ribbon, the manufacturing yield becomes poor, and the surface properties of the ribbon deteriorate. In addition, the crystallization temperature decreases, and the temperature and time required for heat treatment for precipitation of microcrystals become stricter, making it difficult to partially contain crystalline materials as described above.

Furthermore, if 2 is less than 21, Q at %, corrosion resistance will be poor and durability will also be poor. On the other hand, Z is 21
．． Within the range of 0 to 25.5 at%, the calorific value is significantly small, and there are no other drawbacks as mentioned above.

The thin ribbon in the invention of this application is 0.1 to 0.1 as described above.
Contains 10 at% Mn, 21.0 to 25.5 at% of a vitrifying element containing St, B, P, and C, and other vitrifying elements X added or mixed as necessary, and the remainder is a total of Fe and other transition metal elements M that may be included as necessary in addition to Fe, from 64.5 to ? 8.9a
t%, more preferably 69.5 to 78.9at.

In this case, the content ratio t of transition metal elements M other than Fe and Mn is equal to the content ratio of Fe, k-1-4 = 100
0 to 10%, more preferably 0 to 5% under the conditions of
It is. If t is more than 10%, the magnetic properties will deteriorate, especially the loss will be poor, the amount of heat generated will increase, and the magnetic permeability will decrease, which is not preferable.

On the other hand, the vitrification element is p+q+r+s+t=100%
Under the conditions of p% Si, q% B, 1% P,
! It consists of an essential component of +'% C and t% of other vitrifying element X, which may be included as necessary.

In this case, the silicon St content ratio p in the vitrification element is 4
It is 0-70%. If p is less than 40% or greater than 75%, the amount of heat generated will increase.

Moreover, if it is less than 40%, magnetic properties such as magnetic permeability will deteriorate. Furthermore, the amount of heat generated, magnetic permeability, etc. deteriorate significantly over time. On the other hand, if it is larger than 75%, the magnetic properties are unsatisfactory.

In addition, between the total content of vitrifying elements 1zat% and the St content ratio p% in the vitrifying elements, 2≦0.5p+1, and 2≦0.19+19, and 270, 3p+2 , and the relationship 2≧0.13P+13.7 must be satisfied.

That is, to explain these conditions based on Figure 1, when expressed in coordinates (z, p), point A (40, 2
1,0) B(45,23,5), C(65,25,
5), D(75,25,5), EC75,24,5),
F(70,23,0) and F(55,21,0)'!
The area connected by i-sequential straight lines and surrounded by one state is the condition in which 2 and p are satisfied in the invention of this application.

Only within this region, the amount of heat generated is significantly reduced. Note that the illustrated c-Dy5 (z==25.
5) The inconveniences above and below the G-A line (Z=21.0) are mentioned above.
B line (z=0.5p+1) and B-C5 (z=0.1
p+19) Above, the calorific value increases and
It has poor magnetic properties and deteriorates significantly over time. Also, E-Fi(z
=0.3p+2) and F-G line (z=0.13p
+13.7) Downward, there is a disadvantage that the amount of heat generated increases and it becomes difficult to obtain an amorphous thin plate using the 1-high speed quenching method. Further, below the E-F line and the F'-G line, the heat treatment conditions for precipitation of microcrystals are severe, and it is difficult to cause crystals to partially exist.

Furthermore, the phosphorus P content ratio r in one vitrification element is 0.01 to
5%, preferably 0.01-2%. 0.01
If it is less than 5%, the deterioration of heat generation, magnetic permeability, etc. over time will increase, and if it is more than 5%, the heat generation will increase and the DC superimposition characteristics will deteriorate. And 0.01-5%,
Preferably 0.01-2 inches, the calorific value is sufficiently small,
Its change over time is sufficiently small, and its magnetic properties are also excellent.

Further, the value obtained by dividing the carbon C content ratio S in the vitrification element by the boron B content ratio q must be 0.05 to 0.4. Only when the value becomes larger than 0.05, changes in heat generation and magnetic permeability over time become sufficiently small. However, if it exceeds 0.4, it becomes difficult to form a thin ribbon. Also, the amount of heat generated increases.

In addition, as mentioned above, as a vitrification element, another vitrification element X may be contained.

However, if the content ratio t exceeds 10%, the magnetic properties will be impaired, so t is 0 to 10%.

The ribbon in the invention of this application is not particularly limited as long as it satisfies the conditions detailed above.

However, as a result of partially introducing crystalline material into the ribbon, especially when magnetic anisotropy was imparted in a predetermined direction within the ribbon surface, the magnetic permeability improved and the amount of heat generated was further reduced. Furthermore, it is preferable in that various magnetic properties can be easily adjusted.

In this case, the magnetic anisotropy is preferably introduced as normal-axis anisotropy in one predetermined direction within the plane of the ribbon.

That is, when a thin ribbon of a nearly completely amorphous magnetic alloy is heat-treated in a non-magnetic field before or in some cases after the winding described below, microcrystals are precipitated. Uniaxial anisotropy is imparted to the longitudinal direction of the ribbon, and the magnetic permeability is improved at this time. In addition, if microcrystals are precipitated by heat treatment by applying a magnetic field before or after winding the ribbon in a direction that makes a predetermined angle with the longitudinal direction of the ribbon, −-axis anisotropy is imparted in the direction forming the , and at this time, by setting the anisotropy direction to a predetermined direction, the squareness ratio and the B-H loose unsaturated region can be adjusted as desired. Also, the amount of heat generated can be significantly reduced.

The existence of such magnetic anisotropy means that, according to the usual method, the torque curve is +1! This can be easily verified by measuring the

Such a ribbon is a long thin plate having a thickness of about 10 to 100 μm and a width of about 0.1 to 50 crn.

Next, the magnetic core for a choke coil in the second invention of this question is constituted by a wound body formed by winding a thin ribbon like this.

That is, the magnetic core may be formed from the wound body itself formed by winding the ribbon.

Alternatively, the wound body may be cut into a U-shaped, C-shaped, ■-shaped, L-shaped, etc.-shaped cut body, and the cut body may be used as a cut core, and the cut cores may be butted against each other to form a magnetic core.

Furthermore, the cut bodies are connected to form a cut core having a predetermined shape, such as an E-shape, and the cut cores are matched together, or this cut core is matched with a cut core consisting of the above-mentioned one-character-shaped cut body. It may also be used as a magnetic core.

In this way, when the magnetic core is formed into a completely cut core shape, the winding operation becomes easy.

As described above, the magnetic core of the second invention is composed of a wound body of thin ribbons, and is not made by laminating thin ribbons into a predetermined shape. This is due to the following reasons.

That is, as described above, preferable results are obtained when the ribbon is given uniaxial magnetic anisotropy in a predetermined direction within the ribbon surface due to the precipitation of microcrystals. The treatment for precipitation of such microcrystals is usually carried out before the formation of a wound body, and then a single wound body is obtained from this process, but the direction of the easy axis in the resulting wound body is Since it is constant with respect to the direction of the magnetic path, high characteristics such as the amount of heat generated can be obtained. On the other hand, when creating a laminated structure, for example, a thin strip having a certain in-plane anisotropy is etched or punched.
Since these are laminated, the directions of the magnetic path and the easy axis are not constant, and high properties such as heat generation cannot be obtained.

Furthermore, even when performing a treatment for precipitation of winding diameter microcrystals, an easy axis having a desired arbitrary constant angle can be easily introduced into the magnetic path. On the other hand, in the case of the laminated type, it is not possible to set the angle between the two to an arbitrary value at a constant angle in the magnetic path, and even if it were possible, it would be extremely difficult.

The magnetic core of the second invention has an easy-to-axis axis not only when it is made of the wound body itself, but also when it is made into various cut core shapes as described above, and even when it is provided with a gap as described later. The angle with the magnetic path direction is always constant and can be any angle.

Note that the wound type is also better in terms of characteristic deterioration during core processing. As a result of the magnetic core of the second invention being composed of a wound body in this manner, it is easy to manufacture and the manufacturing cost is low.

In the case where the magnetic core "fI: is constructed from a wound body in this way, the wound body is formed by winding a ribbon around a predetermined winding frame 1 core, etc., and fixing the ends. In this case, the winding frame.

The structure, shape, etc. of the winding core etc. may be various. In addition to porcelain, glass, resin, etc., the material may be metal, and one end may be fixed by adhesive, welding, chives, etc., or by providing it on a winding frame, etc. It may also be done by caulking with a caulking nail or the like.

Note that an insulating material may be interposed between the wound ribbons. Also, unlike the above, it has a winding frame.

The shape can also be fixed, for example, by impregnating it with a resin or the like, without using a winding core or the like. In addition, the shape of the ribbon can be changed in various ways, such as a circular ring shape or a square shaft shape.

On the other hand, in order to cut such a wound body to obtain a cut body and make it into a cut core in a 1-shape, a 0-shape, a C-shape, etc., it is necessary to It may be impregnated with resin or the like and fixed, or fixed with caulking nails, etc., and then cut.

Further, by gluing the thin strips or winding frames of the cut pieces together, a predetermined E-shaped cut core can be formed. From these various cut cores, magnetic cores with various cut core shapes such as U-U and E- are constructed.Furthermore, in the magnetic path of these various magnetic cores, there is a gap in a part of the magnetic path. It is preferable that it is formed.

This is because the presence of voids expands the unsaturated value range of B-H loose and improves DC superposition characteristics.

In this way, in order to provide a gap in a part of the magnetic path, the cut portion may be fixed and the wound body may be cut in a predetermined gap, as in the case of forming the cut body, or the wound body may be cut in a predetermined gap. A predetermined gap may be provided when the cut cores are butted together.

Note that the air gap length is usually 0.001 to 0.05 of the magnetic path length.
It is sufficient to set the degree.

The ribbon and choke coil magnetic core of the invention of this application are:
Usually, it is produced as follows.

First, a nearly completely amorphous ribbon is obtained from a corresponding afiy master alloy according to a known high-speed quenching method.

The ribbon is then usually subjected to a treatment for precipitation of microcrystals.

Such treatment is usually carried out in the absence of a magnetic field by heating at a temperature near the crystallization temperature for an appropriate period of time, followed by cooling, for example air cooling. The heating temperature, heating time, cooling rate, etc. can be easily determined experimentally depending on the required characteristic values. The atmosphere for such heat treatment may be air, vacuum, inert gas, non-oxidizing gas, or the like.

Alternatively, the heat treatment described above can also be performed in a static magnetic field. In this case, the application peak is, for example, 1
It is assumed to be approximately 000e. At this time, anisotropy forming a predetermined angle with the longitudinal direction within the ribbon surface is imparted. Further, the heat treatment can be performed while applying tension, or even in a rotating magnetic field depending on the case.

Next, as described above, this thin ribbon is wound to obtain a wound body, which is used as a magnetic core. Various cut cores are formed from this to form a magnetic core, and furthermore, a predetermined gap is provided. , a magnetic core for a choke coil according to the invention of this application is formed.

Note that the ribbon may not be subjected to the treatment for precipitating microcrystals in advance, but the treatment may be performed either after producing the wound body, after forming the cut core, or after forming the voids. Further, when the ribbon is previously subjected to a treatment for precipitation of microcrystals and then a wound body is obtained, a heat treatment may be separately applied to remove strain after the formation of the wound body.

Then, the magnetic core as described above is subjected to predetermined winding and other predetermined processing to form a choke coil.

Such choke coils are used as coils for removing ripples, on/off surges, etc., used in switching regulators, inverters such as thyrisk inverters, and various electrical devices such as ordinary DC power supplies.

The magnetic core for a choke coil using a ribbon according to the invention of this application generates extremely little heat when completely removing high frequency components that are constantly or periodically superimposed on a direct current or alternating current, for example, an alternating current of about 50 Hz.

In addition, the magnetic properties such as magnetic permeability are good, and the squareness ratio, unsaturated region of the B-H loop, etc. can be easily adjusted as desired. It can effectively remove off-surge currents and has an extremely wide range of applications. Furthermore, there is extremely little change in various properties over time. Furthermore, the heat treatment conditions for precipitation of microcrystals are wide-ranging, and manufacturing is easy. Furthermore, it has high corrosion resistance etc. Next, examples of the invention of this application will be shown and the invention of this application will be explained in more detail.

Example 1 Composition Fe76.7 MnO, 3s included in the above formula
i, 4By, b Pa,, C+, 3 (z = 23
at%, p = 60.9%, r = 0.4%, sA =
An amorphous magnetic alloy ribbon A having a composition Fe745i43B+3 outside the range of the above formula was obtained by a high-speed quenching method. Both are almost completely amorphous, and both PL have a thickness of 30 μm and a width of 8 m.
! It is.

Next, each of these ribbons A and B was divided into five parts, one of which was not subjected to any treatment, and the other four were heat-treated in a non-magnetic field at the temperature and time as described in Clothing 1 below. and
Samples A-1 to A-5 and samples B-1 to B-5 were obtained.

Table 1 A-I 250℃, 60 minutes Halo only-I 500℃, 10 minutes Peak only Halo only 250℃, 60 minutes Halo only 400℃, 30 minutes Halo peak 440℃, 20 minutes Halo peak 500℃ , 10 minutes to show the peak, and then cut the winding body to form a gap of width 1cm in the magnetic path, magnetic cores A-1 to A-5 for choke coils,
B-1 to B-5 were obtained.

Magnetic cores for choke coils A-1 to B thus obtained
-5, the coil was wound so that L = 30 μH, and it was incorporated into a 5V 130A forward converter switching power supply driven at 50 kHz as a choke coil for ripple removal, and a heat generation test was conducted. Measuring the temperature rise of the magnetic core when the output current is 20A,
The results shown in Figure 2 below were obtained.

When X-ray diffraction was performed on these samples A-1 to B-5, the results shown in Cloth 1 above were obtained.

Next, the above ribbons A and Bt were divided into 5 parts, each having an inner diameter of 19II.
Il! The material was wound into a toroidal shape having an outer diameter of 31 tIIl and a width of 8 m to obtain a total of 10 wound bodies. A total of 10 rolled bodies A-1 to B-5 thus obtained were subjected to a total of 10 types of heat treatment shown in the above-mentioned Cloth 1, and then the rolled bodies were impregnated with an epoxy resin. Curing Table 2 80℃ 50℃ A 5A × △ A-580℃ or higher 5A ○B-180
℃ 5A XB-25
0℃ 15A ΔB-33
0℃ 20A ΔB-43
0° C. 20 A Δ Separately, the DC superimposition characteristics of choke coils wound at the above-described setting of =30 μH were measured for magnetic cores A-1 to B-5. For each coil, the DC current value at which L=20 μH or less is also listed in Table 2.

Furthermore, each of these choke coils Abi'i was kept in a constant temperature bath at 120° C. for 1000 hours, and the above-mentioned calorific value and DC superimposition characteristics were measured, and changes in characteristics over time were evaluated. The results are also listed in Cloth 2 above. In the table, × indicates that there was a large change, Δ indicates that there was a change, and O indicates that there was no change.

From the results shown in Table 2, it can be seen that the ribbon of the invention in this question has the composition shown by the above formula and partially contains crystalline material.
The excellent effect when used as a magnetic core for a choke coil is obvious.

Example 2 In the above formula, Mn content y k 1- Oat%
, P content ratio in the vitrified element fraction r f Oll a
t% and the content ratio s/q of C and B are each fixed at 042, and the amount of vitrification element component 2 and S in the vitrification element fraction are
Various ribbons were produced by changing the i-containing colorimetry.

Next, each ribbon was wound into a toroidal shape with an inner diameter of 19 mm, an outer diameter of 31 mm, and a width of 8 m, and each wound body was heat-treated at 440°C for 40 minutes in a non-magnetic field to impregnate it with an epoxy resin. Various types of magnetic cores were obtained by fixing and providing a 1 mm gap in the magnetic path. As a result of the heat treatment performed in this manner, a halo and a peak were present in the X-ray diffraction spectrum of each thin plate.

Next, for each of the magnetic cores thus obtained, a choke coil was produced in the same manner as in Example 1, and the same calorific value test as in Example 1 was conducted to measure the temperature rise of the magnetic core. The results are shown in Figure 2. In Fig. 2, the horizontal axis shows the Si shoulder ratio p in the ribbon, and the left vertical axis shows the amount of vitrification element 2, and in coils obtained from various thin plates with different values of 2 and p,
Composition lines whose temperature increases ΔT are 50° C., 30° C., 25° C. and 20° C. are shown, respectively.

From the results shown in Figure 2, A-B-C-D-E-F-
The coil obtained from the ribbon of the invention of this application having a composition within the region surrounded by G-A shows a temperature increase of only about 25° C. or less, whereas the coil obtained from the ribbon outside the above region. It can be seen that the amount of heat generated by the coil increases.

In addition, when we measured the DC superposition characteristics, heat generation amount, and changes over time in the DC superposition characteristics for various coils in the same manner as in Example 1, we found that the values are surrounded by A-B-C-D-E-F-G-A. The coils obtained from the ribbons having the compositions in the above range all exhibited excellent characteristics equivalent to those of the coils A-3 and A-4 in Example 1.

Furthermore, each composition was heat-treated for 40 minutes to determine the calorific value,
An allowable range ΔTan of the heat treatment temperature Tan for obtaining good characteristics in terms of direct current superimposition characteristics and changes over time was determined. ΔTa
Composition lines where n is 20°C, 30°C and 40°C, respectively, are shown in FIG.

From the results shown in FIG. 3, it is clear that A-B of the invention of this application.
It can be seen that the ribbon having a composition within the region surrounded by -C-D-E-F-G-A exhibits a heat treatment temperature of 20°C or higher.

Note that all ribbons having compositions within the region surrounded by A-B-C-D-E-F-G-A exhibited excellent corrosion resistance.

Example 3 p=Q, 7%, s/q = 0.32 K fixed, M
Four types of amorphous magnetic alloy ribbons with different compositions shown in Table 3 below, each having a different spindle content y, were obtained.

Using these four kinds of ribbons, wound bodies having the same dimensions as in Example 1 were prepared, and each wound body was heat-treated and then fixed by resin impregnation to form a gap of IIIll.

Similarly to Example 1, a choke coil was formed and the temperature rise was measured when it was incorporated into a switching power supply.

Table 3 below shows the heat treatment temperature range at which the temperature rise is 25° C. or less when the total heat treatment time for each wound body is fixed at 40 minutes.

In both cases, as a result of X-ray diffraction, ... low and peak were present.

Table 3 Example 4 Amorphous magnetic composite ribbons having four different compositions of s/q as shown in Table 4 below were obtained.

Table 4 D -I Fe75.5 P'1r1as Sl
1! , 5 Ba4P(Ll 0D -2Fe
75.5"Cl35i15.5B,,6P01C,80
, 1D -3Fe 75.5 Mnαs St 15.
sB6. s Po, t Ctq 0.3D-4F
e Mn St B P C
O,575,5Q,5 15.5 4.2 0
．． 1 4.2-I Fe75 S '17.5 B5.6 C1,8Po,
+Fe74B MeQ, 2Si17.5 B5L6
C1,8PalFe73Mn2Si17.5B5.6C
1,8P [L1F870an 55i17.5 B5.6
C1,8Pα1 From the results shown in Table 3, the shoulder content of Mn is 0.1 to 10 at%, more preferably 0.1 to 5 at%.
It can be seen that when the temperature reaches t%, the heat treatment temperature range for precipitation of microcrystals becomes wider.

Using these four types of ribbons, a wound body having the same dimensions as in Example 1 was prepared, and each wound body was heat-treated in the same manner as in Example 1.
A magnetic core was prepared by providing an air gap. Each thin strip of magnetic core had a halo and a peak in X-ray diffraction.

A choke coil was obtained by winding with L=30 μH, and the DC superimposition characteristics were measured in the same manner as in Example 1, and the DC current value at which each coil's radius was 20 μH or less was measured. The results are shown in Table 5 below.

Table 5 Table 6 D-122A △D-225A
0D-325A
0 From the results in Table 5, s/q is 0805 to 0.4
It can be seen that the DC superimposition characteristics are improved.

It was confirmed that coil D-4 generated a lot of heat and was not suitable as a choke coil core.

On the other hand, each coil was placed in a thermostat at 120°C for 1000
The test was held for a period of time, and changes in the DC superimposition characteristics thereafter were investigated. The results are marked with ○ (no change) and △ (change).
It is shown in Clothing 5 above.

From the results in Table 5, it can be seen that good aging characteristics are exhibited when S/q = 0.05 to 0.4.

Example 5 All four types of amorphous magnetic alloy ribbons having different phosphorus content ratios shown in Table 6 below were obtained.

Thin ribbon composition E ”' 1 1”e 75. b MrlIla St
14,587. q C1,6E ″2 Fe756
Excitation a4Sl + a, 5 B7. q Cts Po, 1
g-3Fe75.6 Seed (Ia S'14.5 B7.
5 C10Pt0E -4Fe ys, b P'1rl
c4Sl 1a, s Bio Co, s P3 These 4
For the seed ribbon, a wound body having the same dimensions as in Example 1 was prepared, and in the same manner as in Example 1, each wound body was heat-treated to provide a gap to form a magnetic core.

X-ray diffraction revealed that each magnetic core ribbon had a halo and a peak.

A choke coil was produced from each of these magnetic cores in the same manner as in Example 1, and as in Example 4, the direct current value at which L=20 μH and its change over time were measured. The results are shown in Table 7 below.

Table 4 Carp J' when L = 20 μH DC current value Change over time E
-126A ΔE-226A
0E-324A
○E-420A
From the results in Table 7 it can be seen that r must be between 0.01 and 5%, more preferably between 0.01 and 20%.

Example 6 Fe77.7"Q, 3 S'11 B9.OC1,9
A 30 μm thick amorphous magnetic alloy thin plate having a composition of Po, 1 was obtained, and in exactly the same manner as in Example 1, a magnetic core F covering the gap was obtained from the wound body.

On the other hand, the thin strip was cut out into a ring shape with an inner diameter of 19 fins and an outer diameter of 31 fins, and after heat treatment, choke coils were fabricated from the two types of magnetic cores fabricated in this way in order of 8 widths, with L = 30 μH. Then, a heat generation test was conducted in the same manner as in Example 1.

In this case, when the DC superposition characteristics were kept almost the same for magnetic cores F and G, and the DC current value at which L = 30 μH was set to 25 A, the temperature rise for magnetic core F was 20°C, while for magnetic core G it was 30°C. It was ℃.

On the other hand, when the amount of heat generated, that is, the temperature rise ΔTi is approximately equal to 20° C., the DC current value for L=20 μH was 25 A for the magnetic core F, while it was 20 A for the magnetic core G.

These results show that it is preferable for the magnetic core to be composed of a wound body.

[Brief explanation of the drawing]

FIG. 1 shows the composition of the amorphous magnetic alloy ribbon in the invention of this application, especially the Si stone content ratio p(a) in the vitrification element fraction.
FIG. 3 is a diagram for explaining the relationship between the amount of vitrification element component and the amount of vitrification element component Z (support). FIGS. 2 and 3 are diagrams for explaining the effects brought about by the relationship between p% and z% in the amorphous magnetic alloy ribbon according to the invention of this application. 1st figure sum 5゜ 5th figure 4゜5゜ω P(?/,) 2nd figure 5゜■ 帥

Claims (1)

[Claims] 1. A non-magnetic magnetic alloy ribbon for a choke coil, which partially contains crystals and has a composition represented by the following formula. Formula (Fe_kM_l)_xMn_y(Si_pB_qP
_rC_sX_t)_z [In the above formula, M is Fe and Mn
represents one or more transition metal elements other than Si
, B, P and one or more of other vitrifying elements other than C. Further, x+y+z=100 at%, of which y is 0.1 to 10 at% and z is 21 to 25.5 at%. Furthermore, k+l=100%, p+q+r+s+t=100
%, of which l is 0 to 10%, and p is 40 to 10%.
75%, r is 0.01-5%, s/q is 0.05-0.
4. t is 0 to 10%. In addition, z≦0.5p+1
and z≦0.1p+19 and z≧0.3p+2 and z≧
It is 0.13p+13.7. 2. A magnetic core for a choke coil, comprising a wound body formed by winding a thin ribbon of an amorphous magnetic alloy that partially contains crystals and has a composition represented by the following formula. Formula (Fe_kM_l)_xMn_y(Si_pB_qP
_rC_sX_t)_z [In the above formula, M is Fe and Mn
represents one or more transition metal elements other than Si
, B, P and one or more of other vitrifying elements other than C. Further, x+y+z=100 at%, of which y is 0.1 to 10 at% and z is 21 to 25.5 at%. Furthermore, k+l=100%, p+q+r+s+t=100
%, of which l is 0 to 10%, and p is 40 to 7
5%, r is 0.01-5%, s/q is 0.05-0.4
, t is 0 to 10%. In addition, z≦0.5p+1 and z≦0.1p+19 and z≧0.3p+2 and z≦0
．． 13p+13.7. 3. A magnetic core for a choke coil according to claim 2, which is formed by winding a thin ribbon. 4. A magnetic core for a choke coil according to claim 2, wherein a wound body formed by winding a thin ribbon is cut to form a cut core, and a magnetic core is formed from the cut core. 5. Claims 2 or 4 in which a cut core is formed by cutting a wound body formed by winding a thin ribbon and connected to form a cut core, and a magnetic core is formed from the cut core. magnetic core for choke coils. 6. The magnetic core for a choke coil according to any one of claims 2 to 5, which has an air gap in a part of the magnetic path.