KR920006607B1 - Method of making fe alloy for the soft magnetic materials - Google Patents

Abstract

A making method of Fe-alloy [FeaBaSicTidXe for a soft magnetic material is characterized by melting the alloy in vacuum, making an amorphous structure by the rapid quenching, and heat-treating it at 500-700 deg.C for 05-2 hrs in vacuum. In the alloy, X is one selected from Nb, V, Mo, W and Zr. a = 70-80 atm%; b = 6-12 atm%; c = 8-16 atm%; d = 0.2-2.0 atm%; e = 2-6 atm%; a + b + c + d + e = 100. It has advantages of high permeabiliby, low magnetostriction, high hardness value, machinability and high thermal stability. It can be substituted for Co sectioned amorphous material, and it can be applied to magnetic material, magnetic head and magnetic amplifier.

Description

[Name of invention]

Manufacturing method of iron (Fe) alloy for high permeability soft magnetic material

[Detailed Statement of Invention]

The present invention relates to a method of manufacturing iron (Fe) alloy for high permeability soft magnetic materials that can be used in various high functional soft magnetic components, such as magnetic core materials, magnetic heads, magnetic amplifiers, and more specifically, Fe-Si- After melting the B-Ti- (Nb, V) alloy and rapidly cooling to prepare an amorphous alloy thin plate, and then crystallization heat treatment to ultra-fine crystal structure, the present invention relates to a method for producing an iron alloy for high permeability soft magnetic material. .

In general, magnetic materials are classified into two types, soft magnetic materials and hard magnetic materials. Double soft magnetic materials are materials having magnetic properties, which are easily magnetized and demagnetized. The excellent soft magnetic materials vary depending on the application, but generally include high permeability, saturated magnetic flux density, square ratio (residual magnetic flux density / saturated magnetic flux density), low coercive force, and low iron loss. High degree of corrosion resistance and processability are sometimes important. In recent years, as all electromagnetic parts are light and thin, they are becoming more functional. In particular, as the recording density of recording materials increases, the soft magnetic characteristics of the magnetic head materials appear to be a problem. Among these properties, permeability, saturation flux density, processability and corrosion resistance are very important.

Materials that have been developed until recently include pure iron, silicon steel, permalloy sendust, soft magnetic ferrite, and iron and cobalt based soft magnetic alloys. Among them, pure iron has the advantages of relatively high saturation magnetic flux density and coercive force, easy processing such as rolling, and low price, but it has the disadvantage of low hardness and oxidation resistance and rapid weakening of permeability even in small amount of impurities. There is a difficulty. Silicon steel sheets are developed as directional and non-oriented steel sheets, have low permeability, and are limited in use at high frequencies. In addition, the permalloy has a saturation magnetostriction, that is, when the material is saturated in magnetization, a condition that can make the strain of the material at zero is established, so that a very high permeability can be obtained. Although it is expensive in terms of problems and price, such as maintaining the current, Permaloy is currently used in most applications from the commercial frequency to the audio frequency range. In addition, Sendust is an alloy developed by Masomoro and Yamamoto of East Japan University in 1932, and its representative composition is Fe-9.5 Si-5.5Al, which has magnetic properties comparable to that of permaloy. . = 500) Because of its low ductility, it was pulverized and compacted to form a powder. It was used for low frequency until around '70, but it was rarely used due to the improvement of soft-ferrite characteristics. The perception of sendust is being renewed due to the trend of high speed recording and high speed recording.

In addition, the soft magnetic ferrite has been widely used because of its great improvement in soft magnetic properties. However, it is very noisy when used in high frequency applications, and its saturation magnetic flux density is low. Limits are being revealed.

On the other hand, amorphous soft magnetic materials have excellent magnetic properties, and known iron-based amorphous materials based on Fe-B-Si and cobalt-based amorphous materials based on Co-Ni-B-Si are known. Iron-based amorphous materials have high permeability characteristics, but the saturation magnetostriction is very large in the range of 10 ^-6 , so they are very limited in use in the high frequency region. High-balt-based amorphous materials have excellent high frequency characteristics, hardness, and corrosion resistance. Although it is gradually expanding, Co itself is a rare element and is very expensive, so the rate of commercialization is very slow.

Accordingly, the present invention provides an iron-based soft magnetic material in which the final structure is crystallized instead of an amorphous state by appropriately heat-treating an Fe-Si-B-Ti- (Nb, V ...) alloy having an appropriate composition. The purpose is to produce iron alloys for soft magnetic materials with high magnetic permeability, high permeability, low distortion and high thermal stability.

Hereinafter, the present invention will be described in detail.

The present invention represents Fea Bb Sic Tid Xe (where Fe is iron, B is boron, Si is silicon, Ti is titanium, X is one selected from the group consisting of Nb, V, Mo, W and Zr, a = 70-80atm%, b = 6-12atm%, c = 8-16atm%, d = 0.2-2.0atm%, e = 2-6atm%, and a + b + c + d + e = 100). The present invention relates to a method for producing a high permeability soft magnetic iron (Fe) alloy by melting a vacuum and rapidly cooling an alloy of an amorphous structure prepared by rapid cooling at 500-700 ° C. for 0.5-2 hours.

In the above, B is a component that helps to form the amorphous structure of iron without significantly reducing the saturation magnetic flux density, the addition amount is preferably 6-12 atm%. The Si shows an increase in saturation magnetostriction and a decrease in permeability when added below 8 atm%, and when added above 16 atm%, the saturation magnetic flux density is greatly reduced, and the content thereof is preferably limited to 8-16 atm%.

The Ti promotes the production when the crystallization is amorphous, but when added below 0.2atm%, its role is very small, and when added above 2atm%, the final grains are increased while reducing the formation of amorphous, the content thereof is 0.2- It is preferable to limit to 2 atm%. The X component (one of Nb, V, Mo, Ta, W and Zr) is a high melting point metal and is added as a component added to suppress the growth of crystal grains during crystallization, preferably 2-6 atm%.

In the case of adjusting the alloy with the composition ratio as described above, when a phase change occurs from an amorphous state to a crystalline state, it provides a large amount of nucleation sites of the grains to suppress the growth of grains as much as possible and thus crystallization according to the dendritic growth of grains It can reduce the anisotropy and make the tissue uniform. When the heat treatment temperature is 500 ° C or less in the heat treatment before the nucleation of crystal grains is very difficult to crystallize it is preferably limited to 500 ° C or more.

Hereinafter, the present invention will be described in detail through examples.

EXAMPLE

After the Fe-B-Si-Ti-X alloy of Table 1, consisting of Fe, B, Si, Ti, and X (Nb, V, Mo, W, Zr) having a purity of 99.9%, was dissolved in a vacuum melting furnace, Rapidly solidified at a rate of 10 ⁶ ˚C / sec using a cooling roll to prepare an amorphous thin plate having a width of 8mm and a thickness of 15-20μm, heat-treated under the conditions of the following Table 1, and then magnetically The properties were measured using the Single Sheet BH Test and the results are shown in Table 2 below.

TABLE 1

TABLE 2

Note: Bs-saturated magnetic flux density, measured under applied magnetic field of 10 Oe.

Hc-magnetic force, measured under alternating current storage of 1 Oe-60 Hz.

μmax-maximum magnetic permeability, measured under alternating current of 1 KHz.

λ s-foam why, measured under a magnetic field of 20 Oe.

Hv.-Vickers microhardness value, measured by applying a load of 10 gr.

* -Existing amorphous product.

Inventive Example (1-15) having a component and heat treatment condition according to the present invention is much superior in magnetic flux density (Bs) and maximum magnetic permeability (μmax) compared to conventional iron and cobalt-based amorphous materials (Prior Example 1). And magnetic field distortion (λ s) (magneto striction), which is almost equivalent, and magnetic flux density (Bs), which is comparable to that of expensive cobalt-based amorphous material (Prior Example 2). It can be seen that it shows much superior value and also excellent in hardness, which means that the soft iron material according to the present invention can be replaced with cobalt-based amorphous material, and thus it can be used more favorably in the parts with high wear. It is.

As described above, the present invention provides excellent magnetic properties (especially high permeability and low magnetostriction) by appropriately controlling the alloy composition and heat treatment conditions of the Fe-B-Si-Ti-X (Nb, V ...) alloy. In addition to providing iron alloys for soft magnetic materials with high hardness and excellent workability and thermal stability, it is possible to replace current expensive cobalt-based amorphous materials with inexpensive iron (Fe) soft magnetic materials. Magnetic parts, magnetic materials, magnetic heads, magnetic amplifiers can be used for various purposes.

Claims (1)

FeaBbSicTidXe (where Fe represents iron, B represents boron, Si represents silicon, Ti represents titanium, X represents one species selected from the group consisting of Nb, V, Mo, W and Zr, a = 70-80atm%, b = 6-12atm%, c = 8-16atm%, d = 0.2-2.0atm%, e = 2-6atm%, and a + b + c + d + e = 100). A method of manufacturing an iron (Fe) alloy for high permeability soft magnetic material, characterized in that the alloy of the structure is prepared and subjected to vacuum heat treatment at a temperature of 500-700 ° C. for 0.5-2 hours.