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Fe based large block amorphous nano-crystal magnetic element preparation method

A technology of amorphous nanocrystalline and magnetic components, which is applied in the field of preparing Fe-based bulk amorphous nanocrystalline alloys with good soft magnetic properties, can solve the problem that it is difficult to obtain large bulk nanocrystalline soft magnetic alloys, which cannot meet engineering applications , shape and size limitations, etc., to achieve the effects of reducing iron loss, improving comprehensive magnetic properties, solving energy saving and reducing costs

Inactive Publication Date: 2008-03-19
TONGJI UNIV
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Problems solved by technology

Among these powder metallurgy methods, the high-pressure consolidation method is considered to be an ideal method for the preparation of bulk nanocrystalline alloys, but it usually requires special high-pressure equipment, and the shape and size of the bulk are also greatly affected. However, it is difficult to obtain bulk nanocrystalline soft magnetic alloys, which cannot meet the needs of engineering applications

Method used

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  • Fe based large block amorphous nano-crystal magnetic element preparation method

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Effect test

Embodiment 1

[0035] The amorphous strip (Fe77Zr14B9) is pre-crushed into a size of about 1mm×1mm, put into a QM-3A high-energy ball mill, using agate ball mill jars and balls (ball-to-material ratio 10:1, speed 1400r / min), and using argon gas protection. After ball milling for 3 hours, an amorphous powder with a particle size distribution of 50-70 nm was obtained. The obtained amorphous powder is doped with a small amount of epoxy resin, and then heated and pressed by a qih-62 hot isostatic press, with a pressure of 200MP and a temperature of 450°C to 500°C in the glass transition region of the amorphous alloy, to obtain a thickness of 2mm bulk of amorphous nanocrystalline alloy.

Embodiment 2

[0037] Pre-crushed the amorphous strip (Fe72V1Cu1Nb1.5Mo2Si13.5B9) into a size of about 1mm×1mm, put it into a QM-3A high-energy ball mill, and used an agate ball mill jar and balls (the ratio of ball to material is 10:1, and the speed is 1400r / min) , and protected by argon. After ball milling for 3 hours, an amorphous powder with a particle size distribution of 50-70 nm was obtained. The obtained amorphous powder is doped with a small amount of epoxy resin, and then heated and pressed by a qih-62 hot isostatic press, with a pressure of 250MP and a temperature of 450°C to 500°C in the glass transition region of the amorphous alloy, to obtain a thickness of 3mm bulk of amorphous nanocrystalline alloy. Finally, under the condition of 350°C, put it into a vacuum heat treatment furnace for one hour of annealing heat treatment.

Embodiment 3

[0039] The amorphous thin strip (Fe78Zr13B9) is pre-crushed into a size of about 0.5mm×0.5mm, and put into a low-energy planetary ball mill. The ball-to-material ratio is 5:1, the rotating speed is 400r / min, and vacuum protection is adopted. After ball milling for 30 hours, an amorphous powder with a particle size distribution of 100-120 nm was obtained. The obtained amorphous powder is doped with a small amount of epoxy resin, and then heated and pressed by a qih-62 hot isostatic press, with a pressure of 300MP and a temperature of 450°C to 500°C in the glass transition region of the amorphous alloy, to obtain a thickness of 2mm bulk of amorphous nanocrystalline alloy.

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Abstract

The invention discloses a preparation method of Fe-based bulk amorphous nano-crystal magnetic elements, which comprises the following steps: pre-crashing a Fe-based amorphous belt to flakes of (0.5-1)*(0.5-1)cm<2> size; placing the pre-crashed flakes to a ball mill for an appropriate period of time to obtain amorphous powder of 10nm-200nm size under the protection of inert gases or reducing gases, against sample oxidation; mixing the obtained amorphous powder with a binder; and applying a pressure within a temperature range of glass transition until the pressure is more than or equal to 100MP. For the rapid quenching of amorphous powder, under the reasonable control of temperature, pressure and solidification conditions, the high-density bulk is yielded and simultaneously a large quantity of nano-crystal bulk alloys, with uniform size distribution, are separated out of the amorphous matrix, forming a nano-crystal / amorphous composite phase structure, and the size of the nano-crystals is significantly less than that of those formed by the crystallization of amorphous bulk under normal pressure.

Description

technical field [0001] The invention belongs to the technical field of methods for preparing Fe-based bulk amorphous nanocrystalline alloys with good soft magnetic properties. Background technique [0002] Due to the unique structure of amorphous alloys and the properties of both metals and glasses, such as high strength and toughness, excellent corrosion resistance and magnetic properties, etc., amorphous alloys have attracted widespread attention in the field of material science. [0003] Iron-based amorphous nanocrystalline soft magnetic alloys have excellent soft magnetic properties such as high saturation magnetic induction, low coercive force and high magnetic permeability. Such soft magnetic alloy materials are usually prepared by annealing thin amorphous ribbons. After annealing treatment, a composite microstructure in which nanocrystalline ferromagnetic particles are embedded in an amorphous ferromagnetic matrix can be obtained. [0004] Since the 1980s, due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153H01F41/02B22F3/00
Inventor 严彪杨沙陈伯渠王军唐人剑龙玲
Owner TONGJI UNIV
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