CN101736210A - Novel FeCo-based block amorphous soft magnetic material - Google Patents

Abstract

The invention relates to a novel FeCo-based bulk amorphous soft magnetic material with strong glass forming capability. The alloy consists of Fe, Co, B, Y and Nb elements, wherein the atomic percentages of the elements are as follows: fe 41-62%, Co 6-27%, B22-24%, Y4-5%, and Nb 3-5%. Under the condition of vacuum arc melting copper mold casting, the invention can prepare the bulk amorphous soft magnetic alloy material with the thickness of more than 5mm by utilizing industrial pure iron, commercial pure metal and Fe-B alloy. The alloy system has strong amorphous forming ability and stable supercooled liquid region, and has wide application prospect in the field of electric power and electronic industry.

Description

A Novel FeCo-Based Bulk Amorphous Soft Magnetic Material

technical field

The invention relates to a novel FeCo-based bulk amorphous soft magnetic material with strong glass forming ability and excellent magnetic properties.

Background technique

Amorphous soft magnetic materials, because of their characteristics of high saturation magnetic induction, high magnetic permeability and low loss, have been widely used in the fields of electricity and electronics, and are considered to be the soft magnetic materials with the best comprehensive magnetic properties in the market. Material. The traditional amorphous soft magnetic alloys are mostly obtained through melt quenching technology, and the maximum thickness is mostly less than 50 μm amorphous thin strips. After forming and processing, the produced devices (magnetic amplifiers, transformers) have a large core air gap, which reduces the output. Power density, and the process is complex, it is impossible to produce devices with complex shapes.

Bulk magnetic amorphous material not only has the characteristics of high saturation magnetic induction intensity, high magnetic permeability and low loss of strip-shaped amorphous, but also can simplify the production process and avoid the defects of the above-mentioned strip-shaped products; 1995 , Japan's Inoue group first obtained a bulk amorphous alloy with a diameter of 2mm in the multi-component Fe-Al-Ga-P-C-B system through reasonable composition design, and has excellent soft magnetic properties; since then, a series of good Iron-based bulk amorphous alloys with soft magnetic properties have been developed one after another, such as Fe-(Co, Ni)-(Zr, Nb, Ta)-(Mo, W)-B, Fe-Co-Ln-B, Fe -B-Si-Nb and other alloy systems.

However, in these developed iron-based bulk amorphous alloy systems, most of the components are complex (usually more than 5 elements), the range of amorphous formation is narrow, the ability of glass formation is not strong, the thermomagnetic properties are poor, and the purity of the raw materials is limited. And the preparation environment is extremely demanding. This undoubtedly increases the complexity and material cost of the amorphous alloy preparation process, which is not conducive to commercial development. Therefore, it is necessary to develop novel bulk amorphous soft magnetic materials with strong amorphous-forming ability that are easy to produce.

Contents of the invention

The purpose of the present invention is to develop a new type of bulk amorphous soft magnetic material with strong amorphous forming ability and excellent magnetic properties through reasonable composition design, which can be produced by using cheap raw materials. Not only has large saturation magnetization and low coercive force, excellent thermomagnetic properties and large supercooled liquid region, but also has a strong ability to form amorphous, through the conventional copper mold casting method can be prepared with a diameter of up to or even More than 5mm bulk amorphous alloy.

In order to achieve the above object, the technical solution adopted by the present invention is: a FeCo-based bulk amorphous soft magnetic material is composed of Fe, Co, B, Y, Nb elements, wherein the atomic percentage of each element is: Fe41-62%, Co6-27%, B22-24%, Y4-5%, Nb3-5%.

Compared with the existing iron-based bulk amorphous soft magnetic materials, the present invention has the following advantages:

(1) All the raw materials for preparing the alloy are industrial raw materials without high-purity raw materials, which reduces the cost of materials and provides the possibility for industrial production of bulk amorphous soft magnetic materials.

(2) This alloy has strong amorphous forming ability and a large supercooled liquid region (ΔTx up to 117K), and the FeCo-based bulk amorphous soft magnetic material whose critical size is not less than φ5mm can be prepared by copper mold casting method alloy.

(3) The alloy has excellent soft magnetic properties, the saturation magnetization value reaches Ms=103emu/g, the coercive force is as low as Hc=0.74Oe, and the Curie temperature reaches 538K.

Description of drawings

Fig. 1 is the XRD spectrum of the as-cast Fe47.5Co21B23Y4.5Nb4 alloy rod with a diameter of 5mm obtained by the present invention, which shows a single amorphous structure.

Figure 2 is the DTA curve of the as-cast Fe47.5Co21B23Y4.5Nb4 amorphous alloy. (a) Low temperature part, showing glass transition and crystallization behavior; (b) High temperature part, showing melting behavior.

Figure 3 is the hysteresis loop at room temperature of as-cast Fe47.5Co21B23Y4.5Nb4 amorphous alloy

Fig.4 Thermomagnetic curve of as-cast Fe47.5Co21B23Y4.5Nb4 amorphous alloy

Detailed ways:

Specific implementation mode one:

FeCo-based bulk amorphous soft magnetic materials are composed of Fe, Co, B, Y, and Nb elements, and the atomic percentages of each element are: Fe41-62%, Co6-27%, B22-24%, Y4-5%, Nb3-5%.

Specific implementation mode two:

The amorphous alloy of the present invention all adopts the method for electric arc smelting copper mold suction casting to prepare, and its specific preparation steps are as follows successively:

1. Cut industrial pure iron (99.5wt.%), commercial pure metal Co, Nb, Y (99.5～99.95wt.%) and industrial Fe-B alloy (including 79.8wt.%Fe, 18.3wt.%B , others are oxide impurities). The metal surface was ground, weighed, and ultrasonically cleaned in absolute ethanol.

2. Put the weighed metal raw materials into a copper mold crucible, and perform arc melting under an argon atmosphere to form a master alloy ingot.

3. The master alloy ingot is repeatedly smelted 5 to 7 times to ensure that the alloy components are evenly mixed.

4. Remelting master alloy ingots.

5. Use the copper mold suction casting method to suction cast the smelted ingot into a cylindrical amorphous material.

Example 1

FeCo-based bulk amorphous soft magnetic materials are composed of Fe, Co, B, Y, and Nb elements, and the atomic percentages of each element are: Fe61.5%, Co7%, B23%, Y4.5%, Nb4%. The Fe61.5Co7B23Y4.5Nb4 of the embodiment has strong amorphous forming ability and a large supercooled liquid region (ΔTx=117K), and can obtain a block with a critical size not less than φ5mm under the condition of arc melting copper mold suction casting Bulk amorphous alloy. It has the largest saturation magnetization value (Ms=103emu/g) and the lowest coercive force (Hc=0.74Oe), and the Curie temperature is 518K.

Example 2:

FeCo-based bulk amorphous soft magnetic materials are composed of Fe, Co, B, Y, and Nb elements, and the atomic percentages of each element are: Fe54.5%, Co14%, B23%, Y4.5%, Nb4%. The Fe54.5Co14B23Y4.5Nb4 of the embodiment has strong amorphous forming ability and a large supercooled liquid region (ΔTx=114K), and can obtain a block with a critical size not less than φ5mm under the condition of arc melting copper mold suction casting Bulk amorphous alloy. It has a larger saturation magnetization value (Ms=98emu/g) and the highest coercive force (Hc=1.13Oe), and its Curie temperature is 528K.

Example 3:

FeCo-based bulk amorphous soft magnetic materials are composed of Fe, Co, B, Y, and Nb elements, and the atomic percentages of each element are: Fe47.5%, Co21%, B23%, Y4.5%, Nb4%. The Fe47.5Co21B23Y4.5Nb4 of the embodiment has the strongest amorphous forming ability and the largest supercooled liquid region (ΔTx=117K), and can obtain a block with a critical size not less than φ5mm under the condition of arc melting copper mold suction casting Amorphous alloys and even bulk amorphous alloys with critical dimensions close to φ10mm. It has the lowest saturation magnetization value (Ms=88emu/g) and lower coercive force (Hc=0.91Oe), and its Curie temperature is 538K.

(1) X-ray diffraction analysis

The bulk amorphous Fe47.5Co21B23Y4.5Nb4 amorphous alloy seed with a diameter of 5 mm was prepared by vacuum arc melting copper mold suction casting. The structure of the sample was characterized by X-ray diffractometer. The X-ray diffraction results showed that there was only one broad The diffuse scattering peak of , and its structure is completely amorphous. The test results are shown in Figure 1.

(2) Thermal analysis

For Fe47.5Co21B23Y4.5Nb4 bulk amorphous, use differential thermal analyzer (DTA, Perkin Elmer DTA-7 type) to analyze the glass transition, crystallization and melting behavior of each sample, the heating rate is 20K/min, Figure 2(a) , (b) are the low-temperature and high-temperature parts of the DTA curve, respectively, presenting the processes of each alloy from glass transition, crystallization to melting.

(3) Magnetic analysis

For the as-cast Fe47.5Co21B23Y4.5Nb4 bulk amorphous, use the vibrating sample magnetometer to measure the hysteresis loop at room temperature of each sample, and obtain important magnetic performance parameters such as magnetic saturation strength and coercive force. The maximum applied magnetic field during the measurement process The strength is 20KOe. The test results are shown in Figure 3.

The vibrating sample magnetometer (VSM, JDAW-2000C3 type) for Fe47.5Co21B23Y4.5Nb4 bulk amorphous was used to analyze the thermomagnetic properties of amorphous alloys at high temperature. The heating rate was 15K/min, and the temperature range was 323-773K. The magnetic field strength is 4KOe, and the test results are shown in Figure 4.

Claims (4)

1. A FeCo-based bulk amorphous soft magnetic material is composed of Fe, Co, B, Y, Nb elements, wherein the atomic percentage of each element is: Fe41-62%, Co6-27%, B22-24%, Y4 -5%, Nb3-5%. 2. According to the FeCo-based bulk amorphous soft magnetic material according to claim 1, it is characterized in that: the atomic percentage of each element is: Fe61.5%, Co7%, B23%, Y4.5%, Nb4%. The alloy composition is characterized by the inclusion of metallic cobalt to enhance the amorphous-forming ability. 3. The FeCo-based bulk amorphous soft magnetic material according to claim 1, characterized in that: the atomic percentage of each element is: Fe54.5%, Co14%, B23%, Y4.5%, Nb4%. The alloy composition is characterized by the inclusion of metallic cobalt to enhance the amorphous-forming ability. 4. The FeCo-based bulk amorphous soft magnetic material according to claim 1, wherein the atomic percentage of each element is: Fe47.5%, Co21%, B23%, Y4.5%, Nb4%. The alloy composition is characterized by the inclusion of metallic cobalt to enhance the amorphous-forming ability.

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