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

4 Cites 16 Cited by

AI-Extracted Technical Summary

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...

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.

Application Domain

Magnetic materials

Technology Topic

Phosphoric acidRare-earth element +8

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Examples

Experimental program(3)

Example Embodiment

[0022] Example 1:

[0023] In this embodiment, the alloy molecular formula of 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 smelting: soft magnetic alloys are smelted in a vacuum melting furnace;

[0025] (2) Atomizing powder: directly spray the smelted alloy with nitrogen to obtain amorphous soft magnetic powder, and sieving to obtain powder with less than 100 mesh;

[0026] (3) Granularity ratio: the obtained amorphous powder is subjected to -400 mesh, -300 mesh, -200 mesh, -100 mesh classification treatment and then mixed, the mass percentage content 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% of the magnetic powder weight, and the amount of phosphoric acid is 0.4% of the magnetic powder weight, at 80℃ Perform passivation treatment for 1 hour;

[0028] (5) Compression molding: Add acetone-diluted epoxy resin to the passivated powder. The amount of epoxy resin added is 2% of the magnetic powder weight, and 0.25% of the magnetic powder weight of zinc stearate is added at a temperature of 1700MPa. Press to form a ring-shaped soft magnetic composite material under pressure;

[0029] (6) Heat treatment: annealing the pressed amorphous soft magnetic composite material at 550°C for 1 hour, the annealing atmosphere is argon atmosphere, and the amorphous is transformed into nanocrystalline after annealing;

[0030] (7) Curing: Put the annealed nanocrystalline soft magnetic composite material into the epoxy resin and acetone diluent at 80°C and cure for 2 hours to obtain the nanocrystalline soft magnetic composite material.

[0031] After testing, the electromagnetic parameters of the obtained soft magnetic composite material are shown in the following table.

[0032]

[0033]

Example Embodiment

[0034] Example 2:

[0035] In this embodiment, the alloy molecular formula of 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 smelting: soft magnetic alloys are smelted in a vacuum melting furnace;

[0037] (2) Atomizing powder: directly spray the smelted alloy with nitrogen to obtain amorphous soft magnetic powder, and sieving to obtain powder with less than 100 mesh;

[0038] (3) Particle size ratio: the obtained amorphous powder is subjected to -400 mesh, -300 mesh, -200 mesh, -100 mesh classification treatment and then mixed, the mass percentage content 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 good particle size ratio and acetone phosphate diluent evenly, the dosage of acetone phosphate diluent is 50% of the weight of the magnetic powder, and the dosage of phosphoric acid is 1% of the weight of the magnetic powder, at 50℃ 2h passivation treatment;

[0040] (5) Compression molding: add silicone resin and silicon dioxide diluted with alcohol to the powder after passivation treatment. The amount of silicone resin and silicon dioxide added is 2.5% of the weight of the magnetic powder, and then the weight of the magnetic powder is added. % Barium stearate, pressed into a ring-shaped soft magnetic composite material under a pressure of 1500MPa;

[0041] (6) Heat treatment: annealing the pressed amorphous soft magnetic composite material at 500°C for 2h, the annealing atmosphere is an argon atmosphere, and the amorphous becomes nanocrystalline after annealing;

[0042] (7) Curing: Put the annealed nanocrystalline soft magnetic composite material into a 100°C epoxy resin and acetone diluent and cure for 0.5h to obtain the nanocrystalline soft magnetic composite material.

[0043] After testing, the electromagnetic parameters of the obtained soft magnetic composite material are shown in the following table.

[0044]

[0045]

Example Embodiment

[0046] Example 3:

[0047] In this embodiment, the alloy molecular formula of 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 smelting: soft magnetic alloys are smelted in a vacuum melting furnace;

[0049] (2) Atomizing powder: directly spray the smelted alloy with nitrogen to obtain amorphous soft magnetic powder, and sieving to obtain powder with less than 100 mesh;

[0050] (3) Granularity ratio: the obtained amorphous powder is subjected to -400 mesh, -300 mesh, -200 mesh, -100 mesh classification treatment and then mixed, the mass percentage content of the mixed powder is: -100~+200 mesh 20%, -200~+300 mesh accounts for 30%, -300~+400 mesh accounts for 30%, -400 mesh accounts for 20%;

[0051] (4) Passivation treatment: mix the amorphous powder with a good particle size ratio and the phosphoric acid aqueous solution uniformly. The amount of phosphoric acid aqueous solution is 30% of the magnetic powder weight, and the amount of phosphoric acid is 0.2% of the magnetic powder weight. Perform 0.5h at 150℃ Passivation treatment;

[0052] (5) Press molding: add water glass to the powder after passivation treatment, the addition amount of water glass is 1% of the weight of the magnetic powder, and then 0.1% zinc stearate of the weight of the magnetic powder is added, and it is pressed into a ring shape under a pressure of 2000 MPa Soft magnetic composite materials;

[0053] (6) Heat treatment: annealing the pressed amorphous soft magnetic composite material at 650°C for 0.5h, the annealing atmosphere is an argon atmosphere, and the amorphous becomes nanocrystalline after annealing;

[0054] (7) Curing: Put the annealed nanocrystalline soft magnetic composite material into a 90°C epoxy resin and acetone diluent and cure for 1 hour to obtain the nanocrystalline soft magnetic composite material.

[0055] After testing, the electromagnetic parameters of the obtained soft magnetic composite material are shown in the following table.

[0056]

[0057]

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Nanocrystalline soft magnetic composite material and preparation method thereof

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Abstract

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Example Embodiment

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