JPS61288048A - Fe-base amorphous alloy with low core loss - Google Patents

Abstract

PURPOSE:To obtain an Fe-base amorphous alloy with low core losses fitted for use in high-frequency transformers and common mode choke magnetic cores for high-frequency use or the like by adding Cu to an (Fe-M)-Si-B amorphous alloy. CONSTITUTION:The Fe-base amorphous alloy has a composition represented by a formula, where M means 1 or >=2 elements among Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn and Ni, 0.001<=a<=0.1, 0.1<=x<=3, y<=19, 5<=z<=25 and 15<=y+z<=30. The above amorphous alloy is manufactured by the known liquid rapid cooling method such as single roll, double roll, or other methods.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to the improvement of amorphous alloys, and particularly to high frequency transformers, common motor chains, and other electronic components used at high frequencies of 20 kHz or higher. The present invention relates to an Fe-based amorphous alloy suitable as a magnetic core material.

[Conventional technology]

Conventionally, ferrite has been mainly used as a magnetic core material for high-frequency transformers, chi layers, etc. because it has advantages such as high resistance and low eddy current product. but,
7-elite has a low saturation magnetic flux density and poor temperature characteristics, so it has the disadvantage that it is difficult to miniaturize the magnetic core.

In recent years, amorphous magnetic alloys have been viewed as promising as excellent magnetic core materials because they have a high saturation magnetic flux density that has the potential to compete with conventional magnetic core materials. However, Fe-based amorphous alloys generally have a problem of large iron loss at high frequencies.

For this reason, efforts are being made to reduce the magnetostriction constant and reduce the loss by adding Nb or the like. but,
Conventionally known alloys in which Nb alloys are added to reduce loss do not necessarily have sufficient properties, and there is a problem in that iron loss is larger than in Co-based amorphous alloys.

On the other hand, although Co-based amorphous alloys have a small initial core loss, they generally have a large change in core loss over time, which causes many practical problems.

[Problem that the invention seeks to solve]

As mentioned above (although Fe-based amorphous alloys have the feature of less change over time compared to Co-based amorphous alloys,
Iron loss at high frequency is G.

Because it is larger than the alloys in the system, the temperature of the magnet increases significantly at higher frequencies due to increased iron loss. Therefore, it is important to reduce the iron loss of Fe-based alloys as much as possible.

Furthermore, Fe-based amorphous alloys are inferior to Co-based amorphous alloys in terms of magnetic permeability.

The present invention solves the above-mentioned problems of the prior art, and provides low-loss Fe magnets that are generally suitable for high-frequency transformers and common motor circuits used in high-frequency applications, particularly at frequencies of 50 kHz or higher.
The purpose of the present invention is to provide a non-crystalline alloy.

[Means for solving problems]

In order to achieve the above object, the present invention provides (Fe-M)-8
It is characterized in that Cu is added to an i-B based amorphous alloy to create an Fe based amorphous alloy which has low loss characteristics comparable to those of a Co based amorphous alloy.

That is, the amorphous alloy of the present invention is characterized by being represented by the following compositional formula.゛(Fe1
aMaLoo x y z Cu x Si y B
zHere, M is Ti%Zrs Hls V, Nb%T
a5C1r, MO% A small amount of 1 selected from the group of W, Mn, and Ni (both are one type of element, and a is 0.00
1″″0°1, X is 0.1 to 3, y is 19 or less, 2 is 5
~25, y10z is 15-30.

[For production]

In the present invention, Cu is an essential element, and the reason why the content X is limited to 0.1 to 3 atomic % is because if it is less than 0.1 atomic %, Cu addition has almost no effect on reducing iron loss. On the other hand, if the content is greater than 3 atomic %, the iron loss will be much lower than that without the addition. Further, in the present invention, a particularly preferable range of X is 0.1 to 2j1%, and in this range, the iron loss is particularly small.

In addition, the reason for limiting y-up 2 in the present invention is as follows:
Mainly the above y19 at% or less, z5 to 25 at% I
ll! This is because if it deviates from I, it becomes difficult to make the dinner amorphous. Therefore, in the present invention, a more preferable range of y is 8 to 19 at%, and a more preferable range of 2 is 7
~10 atom%, and y + z ranges from 18 to 21
It is desirable that it is within the range of 6 at%.If it is in the range of 2, the iron loss will be small and its change over time will also be small.In particular, if 2 is in the range of 8 to 9.5 at%, the change over time of iron loss will be small. Comfy and small.

Further, in the present invention, an additional component M that replaces a part of Fe
By limiting the amount a to o,ooi~0.1, - is o,
If it is smaller than ooi, there is almost no effect of reducing iron loss by adding M, and if it is larger than 0.1, the saturation magnetic flux density will be severely reduced and embrittlement will occur easily, making ribbon production difficult. To become.

In addition, when M is Cr or Mn, it has a low squareness ratio, excellent constant velocity magnetic properties, and a very light saturation magnetic field, so it can be used for high frequency transformers for 7-ward converters, and for high voltage pulse noise. Suitable for common motor chirping magnetic cores that exhibit excellent properties against.

Furthermore, when M is Mo or Nb, it not only has low loss but also exhibits high magnetic permeability due to the difference between Co-based high magnetic permeability materials. Suitable for magnetic fields. *It also has high magnetic permeability in the low frequency range, so it is also suitable for external pressure transformers for MC cartridges.

Note that the amorphous alloy of the present invention does not need to be completely amorphous, and may contain crystals to the extent that it does not deteriorate high-frequency magnetic properties, and even if it contains unavoidable impurities, the effects of the present invention will still be achieved. Of course, it is possible to obtain a sufficient amount of

In addition, the amorphous alloy of the present invention can be produced by a single roll method, a twin roll method, or other known liquid quenching methods. The thickness of the alloy ribbon is about 8 to 100 μ-,
A plate having a thickness of 25 μm or less is more suitable as a magnetic material used at high frequencies.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples.

(Example 1) Table 1 shows the Fe-based amorphous alloy according to the present invention and
1 Table (Part 1) Table 1 (Part 2) Table 1 (Part 3) Fe-based amorphous alloy, C, which is a conventional magnetic core material.

It is a table comparing the iron loss of a base amorphous alloy and Mn-Zn7 E-FIT.

In this example, the amorphous-alloy ribbon was made in a single roll process. Ribbon width is 51111% thickness approximately 18μ
- The amorphous alloy ribbon prepared in 6 was wound to have an inner diameter of 15 and an outer diameter of 19. After that, heat treatment was performed in a nitrogen gas atmosphere, and the peak value of the magnetic flux density was determined by the function phase. Bm is 2KG.

Iron loss W, /1° when frequency f is 100kHz. k was measured.

As seen from the ts1 table, the iron loss of the amorphous alloy of the present invention is:
It has lower iron loss and is superior to conventional Fe-based amorphous metals and 7-elite metals.

(Example 2) FIG. 1 shows the structure according to the present invention (Fe @, ** Cr 11
m. , ) yes-x Cu x S Ls** Bs
Amorphous alloy A, (Fe*, ssMoo*o*) yes
s-x Cu x Sits, sB*Bs amorphous alloy B and Fe yy, s-x Cu x 5ils, sB,
I For amorphous alloy C, wave height of magnetic flux density Bm = 2K
G, iron loss at frequency f = 100 kHz Wi / z + * In a composition where the Cu content X is in the range of 0.1-3 atoms, %, the iron loss is lower than that without additives and it shows good characteristics. It is clear that alloy A% with addition of Cr4'Mo
It can be seen that B provides more preferable characteristics with even lower iron loss.

(Example 3) Figure 2 shows (Fel-aMa) rams Cu IS!
13e! B, amorphous alloy, magnetic flux density peak value Bs-2KG, iron loss W1/1° at frequency f = 100kHz. FIG. 3 is a diagram showing the dependence of k on the M amount a.

In the figure, D is M-Cr, E is M=Mo, F is M=Nb, and G is M=Mn.

As can be seen from the figure, the effect of I)M addition, which reduces iron loss, is observed when a is 0.001 atomic % or more.

Note that if a exceeds 0.1, the amorphous alloy rib h becomes more likely to become brittle, making it difficult to produce an amorphous alloy ribbon. Therefore, the range of maple in the present invention is 0.001 to 0.1
And so.

(Example 4) Figure 3 shows the DC B-H curves of Fe-based amorphous metals of various compositions according to the present invention, the iron loss W*/+oak at Bso = 2KG, f = 100kHz, and the iron loss at 1kHz. Effective magnetic permeability μe
1k is a comparison diagram.

In the figure, H is (F e @*I@ Cr @ea ?l5iCu l 5its, and sBsBs amorphous alloy is (Feo**<Mo asss)?@@l Cu I
S jts++sBw amorphous alloy 1J is (Fe *@@
I Mn oeo*) yes Cut SLs,i
B, amorphous alloy, K is (Fe o, *< Nb O, @
@ ) yes Cu + SL**s This is the case of Bs amorphous alloy.

H or J alloys to which Cr or Mn is added show a B-H curve with a low squareness ratio (not saturated);
Because of its excellent permeability characteristics, it is suitable for magnetic cores in high-frequency transformers for 7-ward converters and for common motor circuits that exhibit excellent polarity against high-voltage pulse noise. .

In addition, I alloys containing Mo or Nb have a saturation magnetic flux density higher than that of Co-based amorphous alloys, and exhibit magnetic permeability as high as that of these alloys, so they are used not only as magnetic core materials for high-frequency transformers but also as ordinary It is suitable for magnetic cores for common motor circuits, which exhibit excellent characteristics against common mode noise, and magnetic cores for step-up transformers for MC cartridges.

(Example 5) Table 12 shows the Fe-based amorphous alloy of the present invention (Fe-Cr-
The temperature rise of the magnetic core when a high-frequency transformer is fabricated using Cu-8i-B alloy and mounted in a 100kHz switching power supply is calculated using Co-based amorphous alloy and Mn-Zn-based 7
This is a table comparing a case where a transformer is mounted using Elite.

Table 2 The temperature rise in the magnetic core using the alloy of the present invention is considerably lower than when using the conventional 7-E-Fite, and slightly lower than when using the Co-based amorphous alloy.

(Example 6) Figure 4 is according to the present invention (Feo, as Nbo, os)
ytCu+Si+313s amorphous alloy L1 (Feo, s
s Moo, oi) yycu+si+sBs amorphous metal M and conventional Fe-based madder crystalline alloy (F ety, ss i+
3. sB s) N, Co11tQ quality alloy (Go
==F ess 1liB toMO+) It is a diagram showing the frequency f dependence of the effective magnetic permeability μe of O.

The magnetic permeability of M, the alloy of the present invention to which Mo%Nb is added, is considerably higher than that of the conventional Fe-based amorphous alloy N, and even when compared with Co-based amorphous metal 0, it exhibits a value equal to or higher than that of the Co-based amorphous alloy N.

(51E Example 7) FIG.
+*o@)yyCutSi+3B*Amorphous composite P 1(
Fells'@Cro++oz)yscu+sLJ
*Amorphous association Q and conventional Fety*iSI+s, sB-
Amorphous alloy R% Coy*Fe, Si,,B.

Effective magnetic permeability fie1 at 1kHz of Mat amorphous alloy S
FIG. 3 is a diagram showing the dependence of the excitation magnetic field on Ha.

The Nb-added alloy P according to the present invention has a large μetk and is superior in excitation magnetic field dependence to the conventional Co-based amorphous alloy S.

In addition, the Cr-added Q according to the present invention has less dependence on the excitation magnetic field on Fe1, and is superior to the conventional Fe-based amorphous alloy R in constant velocity magnetic properties.

(Military Example 8) FIG.
s) ytCulSilsBs It is a diagram showing the frequency dependence of the impedance IZ1 of a common moat layer T made of an amorphous alloy and a common mote layer U made of a conventional 7F.

The winding was 40 turns and 0.7-.

Especially in the low frequency side and the high frequency side, the alloy using the present invention is used.
It can be seen that the impedance 121 of this material is much superior to that of 7-elite, and that it is suitable for a common mote layered magnetic core.

(Example 9) Figure 7 shows (Fe, , □Cr, ,,,) mother Cu+Si+sBs amorphous alloy X according to the present invention and the conventional 7 elements)
Y, Co-based amorphous associated gold oyoF e@5itsB l
o Pulse width of 1 μ of common motor chip using alloy
It is a figure which showed the pulse voltage characteristic in sec.

The alloy according to the present invention has a much greater damping effect up to high voltages than those using 7-elite or Co-based amorphous alloys, and therefore has an excellent effect on pulse-like noise at high voltage lulls. It ends with getting.

(Example 10) Figure 8 shows an Fe-based amorphous alloy (Feo, ss) according to the present invention.
N homes) ttc 11 S 1taB
1! FIG. 3 is a diagram showing the leakage common mode noise level characteristics of the switching power supply input terminal when equipped with a conventional common mode multi-layer W using 7 effect units.

The one using the alloy according to the present invention has a lower noise level on the low frequency side and the high frequency side compared to the one using 7-Eight. I know I'm good at it.

(Example 11) FIG. 9 shows Fe (Feo, si Nbo-
as)1! ++i −z It is a figure showing the relationship between the rate of change over time of iron loss (W*4−we)/We and B content 2 of Cu1S 113jBz.

Here, W24 is 100% after being held at 150℃ for 24 hours.
kHz, represents the iron loss of 2KG, and W is 100 before holding.
Represents iron loss at kHz and 2KG.

As can be seen from the figure, even if the B content changes, the rate of change in iron loss over time does not change significantly, especially when the B content is 8 to 9.5' at%
ll! At l, the rate of change over time is almost 0.

〔Effect of the invention〕

As mentioned above, the Fe-based amorphous alloy of the present invention has lower loss at high frequencies (excellent magnetic permeability, etc.) than conventional Fe-based amorphous alloys, so it can be used for high-frequency silance, common motor transmission, etc. Excellent properties can be obtained if

[Brief explanation of drawings]

Figure #11 shows the iron loss W in the amorphous alloy of the present invention. /Diagram showing the dependence of Cu content on... gl!
f is iron I W x/l in the amorphous alloy of the present invention. . Figure 3 is a diagram showing the dependence of k on M amount a, and Figure 3 is a DC B-H curve of the amorphous alloy of the present invention, iron loss Wx/1・ek-1kHz
Figures 1 and 4, which compare the effective magnetic permeability μe, k, show the frequency f dependence of the effective magnetic permeability μe of the amorphous alloy L%M of the present invention and the conventional 1 amorphous alloys N and O. Figure 5 is a diagram showing the excitation magnetic field Hm dependence of the amorphous alloys P and Q of the present invention and conventional amorphous alloys R and S, and Figure 6 is a diagram showing the dependence of the excitation magnetic field Hm on the amorphous alloys P and Q of the present invention and the conventional amorphous alloys R and S. A diagram showing the frequency f dependence of the impedance IZ1 of the common moat layer T made of common mote layer T and the conventional common mote layer U made of ferrite. Figure 8 shows the pulse voltage characteristics of Y and Z using the 7F and the Co-based amorphous alloy. Figure 9 is a diagram comparing the leakage common mode noise level characteristics of the switching power supply input terminals of the common mode chips used.
FIG. 4 is a diagram showing the relationship between 4-W o )/W· and B content 2. 1 Agent Patent Attorney Takashi Honma Figure 1 Ct14 Amount of counterfeiting θε〕 No. 6 Fig. Ma Rōkyō f (shield) $7m Input viewing pressure (V) #8 Fig. side? ILeCf (MHz) No. q Fig. B armrest amount l (atomic %) Procedural amendment (white side 1986) September 13th, Commissioner of the Japan Patent Office Kuro 1) Indication of the Akio case 1985 Patent application No. 127179 Relationship with the case of the person amending the name of the invention Patent applicant address 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Phone number
Tokyo 284-4642 Name (508) Hitachi Metals Co., Ltd. Representative Koji Matsuno

Claims (4)

[Claims] (1) Its composition has the general formula (Fe_1_-_aM_a)_1_0_0_-_x_-
＿y＿−＿zCu_xSi_yB_zHere, M is Ti
, Zr, Hf, V, Nb, TaCr, Mo, W, Mn,
Represented by one or more types of Ni, and 0.001≦a≦0.1, 0.1≦x
A low-loss Fe-based amorphous alloy, characterized in that y≦3, y≦19, 5≦z≦25, and 15≦y+z≦30. (2) In the above compositional formula, 0.001≦a≦0.1,
0.1≦x≦2, y≦17, 7≦z≦10, 18≦y+
The low-loss Fe-based amorphous alloy according to claim 1, characterized in that z≦26. (3) The low-loss Fe-based amorphous alloy according to claim 1 or 2, wherein M is Cr and/or Mn. (4) The low-loss Fe-based amorphous alloy according to claim 1 or 2, wherein M is Mo and/or Nb.