JPS59179751A - Amorphous alloy for saturable reactor - Google Patents

Abstract

PURPOSE:To obtain an amorphous alloy having small saturation magnetization and about zero magnetostriction and suitable for use as a material for a saturable reactor by adding a specified element to a Co alloy contg. Si and B as elements for making the alloy amorphous and by very rapidly cooling the resulting alloy from a molten state. CONSTITUTION:A Co alloy having a composition represented by formula (1) is melted by heating, and the molten alloy is very rapidly cooled by a single- or twin-roll method at >=10<5> deg.C/sec cooling rate to manufacture an amorphous sheet of 10-25mum thickness. The sheet has magnetic characteristics such as 5-8.5kG saturation magnetization and <=+ or -5X10<-6> magnetostriction, and it is suitable for use as a material for the saturable reactor of a magnetic amplifier.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an amorphous alloy leading to a reactor.

(Technical Background of the Invention and Melting Point 9 In recent years, switching power supplies incorporating magnetic amplifiers have been widely used as fixed power supplies for computer peripherals and general equipment).

To Wang Shaoqi, who composes this magnetic amplifier,
Akudol and its iron! Trap magnet/b materials are considered to have excellent square magnetization characteristics.

Conventionally, as such a magnetic core material, Hindelta (trade name), which is made of a Fe-Ni crystalline alloy, has been used.
child.

However, although the center delta has excellent square magnetization characteristics, in high frequency VC of 20 K, Hz or higher, the coercive force becomes large and the cage current loss increases, generating heat, making it unusable. Part 7 (Meanwhile, the switching frequency of a switching source incorporating a magnetic amplifier is limited to 20 K) (limited to z or less). Along with this demand, higher switching frequencies are required, but currently there is no satisfactory magnetic core material that has a small coercive force at crystal frequencies and has excellent squareness characteristics and thermal stability. Amorphous magnetic alloys are attracting attention as a way to improve these points.

The Ministry of Invention and others have conducted extensive research to apply amorphous alloys to the above-mentioned problems, and as a result, the saturation magnetization has been reduced to 5KO.
The amorphous alloy with almost equal strain at 8.5KG or less is 20
We have completed the present invention by discovering the fact that it has a sieve frequency of 2 KHz or more, has low coercive force and high squareness, has particularly excellent thermal and temperature stability, and is suitable for saturable reactors.

(Object of the invention) The present invention has a coercive force (Hc) of 0 even when used in a high frequency range of 20 KH2 or higher, especially at 59 KHz or higher.
．． We aim to provide amorphous metals for 7ζ town saturated reactors, which are small at less than 4Oe, have a large squareness ratio (Br/B1) of 85% or more, and have particularly excellent thermal and thermal stability. purpose.

(Summary of the invention) That is, the amorphous alloy of the present invention has an FA sum magnetization of 5
8.5KG or less, and 1 magnetostriction 0 (magnetostriction ±5
10-' or less). In addition, good 1
Preferably, the magnetostriction ± i
Such an alloy having desirable characteristics m-f for use in 1-reattle is given by the following formula: , (Co,-)(-,F'
exM, ),. (, -z("'aB+-a)z(into the formula (is Ti, VrCr, Mn, Ni, Y, Zr, Nb+M
o, Hf.

Ta, "A', Re, 4; one or more elements selected from the earth elements FA-force, X + y+ Z +,
I is 0≦X≦0.10≦y≦0.2.20≦L, respectively
The number satisfies the relationship: ≦28.0.40≦a≦0.55. ).

In the amorphous alloy of the present invention, SI and B are necessary for the 7th time of amorphization, but the 70-day 2 is set to 20≦2≦28, and when 2 exceeds 28, saturation magnetization occurs. If it is less than 5KG, the temperature stability will be poor, and if it is less than 20, it will be equivalent to or lower than the lees crystal temperature ('i' x ) or the curie temperature (Tc). I can't do it. (7), Fe contributes to high magnetic flux density of the resulting alloy, and has the effect of reducing magnetostriction to zero, and the composition ratio X is set in the range of 0≦X≦0.1. When X exceeds 0.1, the overall magnetostriction increases and the coercive force (Hc
) also increases, which is not a good idea. M(Ti, V, Cr,
Mn, Ni, Y.

One or more of Zr, Nb, Mo, Hf, Ta, W+Re, and rare earth elements) are involved in the thermal stability of the alloy, and their composition ratio y is saturated [I magnetization is 5KC, north of 8. σ is set in the range of 0≦y≦0.2 so that the value is 5beG or less.

The amorphous alloy of the present invention is obtained by rapidly cooling an alloy material having a predetermined composition ratio from a molten state at a cooling rate of 105°0/sec or more (liquid quenching method).

The amorphous alloy of the present invention is produced, for example, by a single roll method and used as a plate-like thin body. In this case, it is virtually difficult to manufacture a thin body with a thickness of less than 10μ by the liquid quenching method, and if the thickness exceeds 25μ, the coercive force at high frequencies increases, so the thickness of the thin body is usually It is preferable to set it in the range of 10 to 25μ (inclusive).

In order to obtain the amorphous alloy of the present invention, it is preferable to heat-treat the acoustic band (formed into a core) at a predetermined temperature and then cool it in oil (for example, by putting it in water). 1. Furthermore, heat treatment in a magnetic field is also effective.

(Embodiments of the invention) (Coo, eo FeO, 06Cro, ot )) l-
(SiO,5Boll)+oo-) (In the composition formula, a ribbon of amorphous alloy of X-79, 77, 75, 72 was produced by a single roll method, and The thickness is 5Tu+ and 20μ, respectively.

From this thin ribbon 18] 138 x 12 Mx 5
A toroidal core of #1J is molded, heat treated at an optimal temperature of 10 or more, and after 7C, quenched in water. In addition, X-
Sample No. 79 has Tx and Tc (eγ) equal to 7C, so it is heat treated near TC. Saturation magnetization of these samples 4
Figure 1 shows the X dependence of πMS (curve A), coercive force He (curve B), and squareness ratio B r / B+ (curve C). 8.
It can be seen that for amorphous alloys of 5KC or higher, the Br/H ratio is low and the Hc ratio is large. When this sample is heat-treated in a magnetic field, Br/B+ becomes approximately 97%, but He may increase to 0.80e.

Furthermore, the temperature stability of the squareness ratio of these samples is shown in FIG. As shown in the figure, X-77 and 75 maintain a square shape ratio with a 150"C case, and can be applied as saturable reactors. Also, 7ζX-73 also has a sufficient squareness ratio up to 130 degrees Celsius.On the other hand, At X=71, the squareness ratio is 90 at 70°C.
%, it drops rapidly at temperatures higher than this. When a saturable reactor is incorporated into a switching regulator, for example, it is necessary to take into account the temperature of about 120°C, and it is difficult to use an amorphous alloy with a saturation magnetization of 5 kg or less as a saturable reactor.

(Effects of the invention) As described above, an amorphous alloy with a saturation magnetization of 51 (G or higher and sK or lower and a magnetostriction of almost 0) has good temperature stability,
Furthermore, it has a low coercive force and a high squareness ratio, making it suitable for saturable reactors.

[Brief explanation of drawings]

FIG. 1 is a graph showing the saturation magnetization, coercive force, and squareness ratio of an amorphous alloy, and FIG. 2 is a graph showing the temperature stability of the squareness ratio. Representative Patent Attorney Noriyuki Chikagi (1 person) 1st
figure

Claims (1)

[Scope of Claims] (1) An amorphous alloy for a saturable reactor, which has a saturation magnetization of 5 g or more, 5 g or less, and a magnetostriction of ±5 x 10' or less. (2) The amorphous alloy is the amorphous alloy 1° (CCJ-y-y Fe x My ) l oo-z(
Sia B+-a) ZM-Ti, V, Cr, Mn,
Ni, Y, Zr, Nb, Mo+I (f, Ta, W
, Re, any of the rare Tochi elements 11 or more O≦X≦0.1 0≦y≦0,2 20≦2≦28 0.40≦a≦0.55