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Amorphous soft magnetic powder core and its preparation method and application

A soft magnetic powder core, amorphous technology, applied in inductor/transformer/magnet manufacturing, transformer/inductor parts, electrical components, etc., can solve the problems of high frequency noise, high DC bias, low permeability, etc.

Active Publication Date: 2022-02-08
KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, with the development of the power electronics industry, the requirements for device miniaturization, multi-function, high frequency and high power density have caused the existing magnetic powder cores to fail to meet the development requirements of modern circuits at the same time. Therefore, amorphous magnetic powder cores with excellent comprehensive performance become one of the main objectives of R&D
At present, there are already FeSiB series amorphous magnetic powder core products prepared by the strip crushing method, which exhibit the characteristics of low loss and high DC bias characteristics, but there are still characteristics caused by low magnetic permeability, high-frequency noise and magnetostriction Stability issues

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  • Amorphous soft magnetic powder core and its preparation method and application
  • Amorphous soft magnetic powder core and its preparation method and application
  • Amorphous soft magnetic powder core and its preparation method and application

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preparation example Construction

[0029] There are still great difficulties in the preparation process of amorphous soft magnetic powder cores, which leads to the stagnation of the research and development of amorphous soft magnetic powder cores. The technicians found that the core reason lies in the high hardness and difficult deformation characteristics of the amorphous powder at room temperature, that is, the amorphous powder basically does not undergo plastic deformation during the press molding process at room temperature, so the density of the soft magnetic powder core is small, resulting in amorphous magnetic powder. The core magnetic permeability and strength are low, and the low loss characteristics of the amorphous magnetic powder core material after pressing are difficult to be fully utilized. Therefore, it is difficult to prepare amorphous soft magnetic powder cores by traditional compression molding technology.

[0030] In order to solve the above technical problems, the present invention proposes...

Embodiment 1

[0058] In this embodiment, iron-based amorphous soft magnetic alloy powder is used, and the composition is Fe76(SiB)24. The glass transition temperature (Tg) of the alloy powder was 350°C, and the crystallization temperature was 480°C. The alloy powder was prepared by water atomization, and the powder was classified by a slap-type vibrating sieve to obtain 80-mesh powder with an average particle size of D. 50 at 30µm.

[0059] The above alloy powder is passivated with 5 wt% phosphoric acid aqueous solution, the weight ratio of 5 wt% phosphoric acid aqueous solution and the above alloy powder is 1:20, and the alloy powder is dried at 100° C. to remove the solvent. Then add 1wt% low-melting glass, the softening point of the low-melting glass is 350°C, finally add 2wt% silicone resin binder and perform drying and pre-curing treatment at 100°C to obtain insulating coating powder.

[0060] The prepared insulating coating powder is spray-deposited (abbreviated as: cold deposition)...

Embodiment 2～5

[0068] In this embodiment, iron-based amorphous soft magnetic alloy powder is used, and the composition is Fe76(SiB)24. The superplastic temperature region of the alloy powder is 350°C, and the crystallization temperature is 480°C. The alloy powder was prepared by water atomization, and the powder was classified by a slap-type vibrating sieve to obtain 80-mesh powder with an average particle size of D. 50 at 30µm.

[0069] The above alloy powder is passivated with 5 wt% phosphoric acid aqueous solution, the weight ratio of 5 wt% phosphoric acid aqueous solution and the above alloy powder is 1:20, and is dried at 100° C. to remove the solvent. Then add 1wt% low-melting glass, the softening point of the low-melting glass is 350°C, finally add 2wt% silicone resin binder and perform drying and pre-curing treatment at 100°C to obtain insulating coating powder.

[0070] The prepared insulating coating powder is cold-deposited to finally form a ring-shaped magnetic powder core. Th...

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Abstract

The invention relates to an amorphous soft magnetic powder core, a preparation method and application thereof. The preparation method comprises the steps of: sequentially subjecting the amorphous soft magnetic powder to passivation treatment and insulation coating treatment to obtain insulation coating powder; heating the insulation coating powder to a preset temperature, and heating the heated insulation coating powder Spray deposition into the forming mold; wherein, the preset temperature is lower than the crystallization temperature of the amorphous soft magnetic powder and ≥ the glass transition temperature of the amorphous soft magnetic powder -30°C, and lower than the amorphous soft magnetic powder The crystallization temperature of the powder. The above-mentioned preparation method solves the problem of difficult compression molding of amorphous soft magnetic powder cores with high hardness and difficult deformation, and at the same time overcomes the problem that large-scale amorphous soft magnetic powder cores require high-pressure molding equipment, so compared with traditional pressing Forming method, the amorphous soft magnetic powder core prepared by the above preparation method has high density, small residual stress, significantly improved magnetic properties such as magnetic permeability of the amorphous soft magnetic powder core, and low loss.

Description

technical field [0001] The invention relates to the technical field of magnetic functional materials, in particular to an amorphous soft magnetic powder core and a preparation method and application thereof. Background technique [0002] Magnetic powder core is a kind of soft magnetic material with distributed air gap characteristics, and its material is composed of ferromagnetic particles, powder surface insulating agent and binder. The ferromagnetic particles rely on the insulating agent on the surface to keep insulated from each other, and rely on the binder to maintain a certain bonding strength with each other. Since the ferromagnetic particles are small and separated by non-magnetic electrical insulating film substances, on the one hand, the eddy current can be isolated, and the material is suitable for higher frequencies; on the other hand, due to the gap effect between the ferromagnetic particles, the material has low conductivity. Magnetic rate and constant magneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F27/255
CPCH01F41/0246H01F27/255
Inventor 郭峰汪贤付邦良刘彬彬
Owner KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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