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A kind of preparation method of amorphous soft magnetic composite material

A technology of soft magnetic composite materials and soft magnetic alloys, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high toughness of amorphous strips, complex process and high cost of amorphous soft magnetic composite materials, and achieve improvement Amorphous formation ability, excellent DC bias characteristics, and effect of improving resistivity

Active Publication Date: 2015-07-29
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the pulverization process of amorphous soft magnetic composite materials is more complicated than other soft magnetic composite materials. The toughness of amorphous strips is relatively high, and it cannot be crushed directly to make powder. It needs to be mechanically crushed after embrittlement treatment. method to prepare magnetic powder
[0005] In the current research, the process of preparing amorphous soft magnetic composite materials from amorphous strips is relatively complicated, and the cost is high. Many non-magnetic insulating substances are mixed in the preparation process, which makes the magnetic permeability of the prepared soft magnetic composite materials On the low side, the comprehensive magnetic properties are not good

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  • A kind of preparation method of amorphous soft magnetic composite material
  • A kind of preparation method of amorphous soft magnetic composite material
  • A kind of preparation method of amorphous soft magnetic composite material

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preparation example Construction

[0020] The preparation method of the amorphous soft magnetic composite material comprises the following steps:

[0021] 1) Preparation of amorphous thin strip: the soft magnetic alloy is smelted in a vacuum melting furnace, and the amorphous thin strip is obtained through a single-roller quenching and stripping process;

[0022] 2) Embrittlement annealing: Embrittlement annealing is carried out on the amorphous strip obtained by the rapid quenching method, the annealing temperature is 300~450°C, the annealing time is 0.5~2h, and the annealing atmosphere is vacuum or non-oxidizing atmosphere;

[0023] 3) Ball milling: Coarsely crush the brittle annealed amorphous strips, use a planetary ball mill to mill, and sieve to obtain amorphous soft magnetic powders less than 100 mesh;

[0024] 4) Particle size ratio: The obtained amorphous soft magnetic powder is classified into -400 mesh, -300 mesh, -200 mesh, -100 mesh and then mixed. The mass percentage content of the mixed powder is...

Embodiment 1

[0033] In this embodiment, the molecular formula of the alloy constituting the soft magnetic composite material is Fe 76 Si 9 B 12 Cr 2 Dy 1 , the following are the specific preparation steps:

[0034] (1) Preparation of Fe 76 Si 9 B 12 Cr 2 Dy 1 Amorphous thin strip: the alloy is smelted in a vacuum melting furnace, and the amorphous thin strip is obtained through a single-roller quenching and stripping process;

[0035] (2) Embrittlement annealing: 350°C / 1h embrittlement annealing is performed on the amorphous strip obtained by the rapid quenching method, and the annealing atmosphere is an argon atmosphere;

[0036] (3) Ball milling: Coarsely crush the brittle annealed amorphous strips, use a planetary ball mill to mill, and sieve to obtain a powder of less than 100 mesh;

[0037] (4) 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 ...

Embodiment 2

[0045] In this embodiment, the molecular formula of the alloy constituting the soft magnetic composite material is Fe 69.7 Si 18 B 12 Y 0.2 Dy 0.1 , the following are the specific preparation steps:

[0046] (1) Preparation of Fe 69.7 Si 18 B 12 Y 0.2 Dy 0.1 Amorphous thin strip: the alloy is smelted in a vacuum melting furnace, and the amorphous thin strip is obtained through a single-roller quenching and stripping process;

[0047] (2) Embrittlement annealing: 300°C / 2h embrittlement annealing is carried out on the amorphous strip obtained by the rapid quenching method, and the annealing atmosphere is an argon atmosphere;

[0048] (3) Ball milling: Coarsely crush the brittle annealed amorphous strips, use a planetary ball mill to mill, and sieve to obtain a powder of less than 100 mesh;

[0049] (4) 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 ...

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Abstract

The invention discloses a preparation method of an amorphous soft-magnetic composite material. The preparation method comprises the steps of preparation of an amorphous thin strip, tendering annealing, preparation of powder through ball grinding, passivating treatment, pressing formation, heat treatment and curing; an alloy component of the amorphous soft-magnetic composite material is iron-based amorphous alloy; the composition of the alloy satisfies the following formula by atomic ratio: Fe100-a-b-cTaMbDc, wherein a is not smaller than 15 and not greater than 30; b is greater than 0 and not greater than 5; c is greater than 0 and not greater than 3; T is one or several selected from Si, B or C; M is one or several selected from Mo, Zr, Y, Ni, Ti or Cr; and D is one or several selected from rare earth elements. The preparation method of the amorphous soft-magnetic composite material, disclosed by the invention, has the advantages of simple process and low cost, adopts phosphoric acid diluent to passivate, and can form an even insulation layer without adding other insulating compounds; and the obtained soft-magnetic composite material has high magnetic conductivity, low loss and excellent direct-current biasing characteristic.

Description

technical field [0001] The invention relates to a preparation method of an amorphous soft magnetic composite material, belonging to the technical field of soft magnetic materials. Background technique [0002] Soft magnetic composite materials refer to soft magnetic materials pressed by magnetic powder coated with insulating medium. They have the characteristics of isotropy, low magnetic permeability and low loss, and are widely used in the power electronics industry. Soft magnetic composite materials have higher resistivity than traditional metal soft magnetic materials and can be applied at higher frequencies. At the same time, soft magnetic composite materials have a higher saturation magnetic induction than ferrite, which can meet the development needs of device miniaturization. [0003] The development history of soft magnetic composite materials has been more than a century. At the end of the 19th century, a soft magnetic composite material made of iron powder coated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/02B22F1/02H01F1/153
Inventor 严密郭婷吴琛郑元红周大海傅国柱
Owner ZHEJIANG UNIV
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