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Nanocrystalline soft magnetic composite material and preparation method thereof

A technology of nanocrystalline soft magnetic and composite materials, applied in magnetic materials, magnetic objects, electrical components, etc., can solve the complex process of nanocrystalline soft magnetic composite materials, large eddy current loss of soft magnetic composite materials, and magnetic properties of soft magnetic composite materials. problems such as low conductivity, to achieve the effects of excellent DC bias characteristics, guaranteed performance, and excellent magnetic properties

Active Publication Date: 2014-10-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the current research, nanocrystalline magnetic powder is generally obtained by crushing strips, and the process of preparing nanocrystalline soft magnetic composite materials is relatively complicated.
A large number of non-magnetic substances were added during the preparation process, resulting in low magnetic permeability of the prepared soft magnetic composite material
In addition, the surface of the powder obtained by crushing the strip is uneven, and it is difficult to form a uniform insulating coating, so that the soft magnetic composite material has a large eddy current loss and poor magnetic properties.

Method used

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  • Nanocrystalline soft magnetic composite material and preparation method thereof
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  • Nanocrystalline soft magnetic composite material and preparation method thereof

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Embodiment 1

[0023] In this embodiment, the molecular formula of the alloy that constitutes the nanocrystalline soft magnetic composite material is Fe 71 Cu 1 Nb 2.9 Si 14 B 11 Dy 0.1 , the following are the specific preparation steps:

[0024] (1) Alloy melting: soft magnetic alloys are melted in a vacuum melting furnace;

[0025] (2) Atomized powder making: Spray the smelted alloy directly with nitrogen gas to obtain amorphous soft magnetic powder, and sieve to obtain a powder of less than 100 mesh;

[0026] (3) Particle size ratio: The obtained amorphous powder is classified into -400 mesh, -300 mesh, -200 mesh, -100 mesh and then mixed. The mass percentage of the mixed powder is: -100~+200 mesh 30%, -200~+300 mesh accounted for 50%, -300~+400 mesh accounted for 15%, -400 mesh accounted for 5%;

[0027] (4) Passivation treatment: Mix the amorphous powder with a good particle size ratio and phosphoric acid alcohol diluent evenly. The amount of phosphoric acid alcohol diluent is 10...

Embodiment 2

[0035] In this embodiment, the molecular formula of the alloy that constitutes the nanocrystalline soft magnetic composite material is Fe 75 Cu 2 Nb 2 P 3 Si 10 B 5 Dy 1 La 1 PR 1 , the following are the specific preparation steps:

[0036] (1) Alloy melting: soft magnetic alloys are melted in a vacuum melting furnace;

[0037] (2) Atomized powder making: Spray the smelted alloy directly with nitrogen gas to obtain amorphous soft magnetic powder, and sieve to obtain a powder of less than 100 mesh;

[0038] (3) Particle size ratio: The obtained amorphous powder is classified into -400 mesh, -300 mesh, -200 mesh, -100 mesh and then mixed. The mass percentage of the mixed powder is: -100~+200 mesh 40%, -200~+300 mesh accounted for 25%, -300~+400 mesh accounted for 10%, -400 mesh accounted for 25%;

[0039](4) Passivation treatment: Mix the amorphous powder with a good particle size ratio and acetone phosphate diluent evenly. The amount of acetone phosphate diluent is 50...

Embodiment 3

[0047] In this embodiment, the molecular formula of the alloy that constitutes the nanocrystalline soft magnetic composite material is Fe 75 Cu 3 P 1 Si 10 B 10 Ho 0.5 Yb 0.5 , the following are the specific preparation steps:

[0048] (1) Alloy melting: soft magnetic alloys are melted in a vacuum melting furnace;

[0049] (2) Atomized powder making: Spray the smelted alloy directly with nitrogen gas to obtain amorphous soft magnetic powder, and sieve to obtain a powder of less than 100 mesh;

[0050] (3) Particle size ratio: The obtained amorphous powder is classified into -400 mesh, -300 mesh, -200 mesh, -100 mesh and then mixed. The mass percentage of the mixed powder is: -100~+200 mesh 20%, -200~+300 mesh accounted for 30%, -300~+400 mesh accounted for 30%, - 400 mesh accounted for 20%;

[0051] (4) Passivation treatment: Mix the amorphous powder with a good particle size ratio and phosphoric acid aqueous solution evenly. The amount of phosphoric acid aqueous solut...

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Abstract

The invention discloses a nanocrystalline soft magnetic composite material and a preparation method thereof. The nanocrystalline soft magnetic composite material is characterized in that iron-based nanocrystalline alloy is used as the alloy component; the alloy structure as shown in a form of atomic ratio meets the formula that Fe (100-a-b-c-d) (lower coordinate)Cu(a) (lower coordinate)T(b) (lower coordinate)M(c) (lower coordinate)D(d) (lower coordinate), wherein a ranges from 1 to 3, b ranges from 15 to 25, c ranges from 1 to 5, d is more than 0 and not greater than 3, T is one or more of Si, B or C, M is one or more of Nb or P, and D is one or more of rare earth elements. The preparation method comprises the steps of smelting alloy, atomizing to prepare powder, passivating, pressing and molding, thermally processing and curing. According to the preparation method of the nanocrystalline soft magnetic composite material, the atomized spherical powder is passivated through phosphoric acid to form an uniform insulating wrapping layer, and the non-crystalline is converted into nanocrystalline during annealing; the obtained nanocrystalline soft magnetic composite material is high in magnetic conductivity, small in loss, and outstanding in DC bias characteristics.

Description

technical field [0001] The invention relates to a nanocrystalline soft magnetic composite material and a preparation method thereof, belonging to the technical field of soft magnetic materials. Background technique [0002] Soft magnetic material is a kind of magnetic functional material, which has the characteristics of high saturation magnetization, high magnetic permeability, low coercive force, etc., and is widely used in the power electronics industry. There are three main types of soft magnetic materials: metal soft magnetic materials, soft magnetic composite materials, and ferrite. Metal soft magnetic materials have good comprehensive magnetic properties and low resistivity, and are generally suitable for low-frequency applications; ferrite is a ferrimagnetic material with low saturation magnetic induction, and generally has a large volume when applied, but ferrite The resistivity is very high, which can be applied to high-frequency occasions; the soft magnetic compo...

Claims

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Application Information

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IPC IPC(8): H01F1/147B22F1/00C22C38/16C21D1/26C22C33/02
Inventor 严密郭婷吴琛姜银珠樊波张彪
Owner ZHEJIANG UNIV
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