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Soft-magnetic powder core and method of preparing the same

A magnetic powder core and soft magnetic technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of high eddy current loss, poor DC superposition performance, etc., and achieve the effect of reducing AC loss

Active Publication Date: 2008-07-23
CHINA JILIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The invention provides a production method for manufacturing amorphous and nanocrystalline soft magnetic powder core materials, which solves the problems of high eddy current loss and poor DC superposition performance in the prior art

Method used

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Examples

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Embodiment 1

[0044] Example 1: A soft magnetic powder core, the materials used are: Fe: 32%wt, Si: 20%wt, Cu: 2%wt, B: 15%wt, Zr: 1%wt, Co: 20 %wt, Hf: 10%wt. First, the alloy is smelted in proportion to make an amorphous strip. After the strip is embrittled at 300°C for 30 minutes, it is crushed into a powder of about 300μm. Pour the powder into an acetone solution in which 5wt% of resin is dissolved for surface treatment, and after drying, mix 0.5wt% of binder into the powder, and granulate and shape it. Pressed into a ring core with an inner diameter of 7.7mm, an outer diameter of 12.7mm, and a height of 1.8mm. The pressed powder core is annealed, and the crystallization and stress relief annealing are completed at one time. The annealing temperature is 550° C. and the holding time is 30 minutes. A magnetic powder core with the following properties is obtained: magnetic permeability: 43; power consumption: 350mW / cm 3 (100kHz, 100mT, 25℃); DC superposition: μ H / μ 0 =84.4% (H=20 Oe...

Embodiment 2

[0045] Embodiment 2, a soft magnetic powder core, the materials used are: Fe: 32%wt, Si: 20%wt, Cu: 2%wt, B: 15%wt, Zr: 1%wt, Co: 20 %wt, Hf: 10%wt. The process steps adopted are: batching, smelting, powder spraying to obtain powder, heat preservation of amorphous powder at 350°C for 30 minutes for stress relief treatment; crystallization treatment of amorphous powder to prepare nanocrystalline powder, after crystallization At the same time, the powder is subjected to transverse magnetic field heat treatment and longitudinal magnetic field heat treatment, and the powder is divided into five grades according to particle size: 25-75 μm, 75-200 μm, 200-500 μm, 500-750 μm, and 750-1200 μm. The prepared powder is in a nanocrystalline state, and a magnetic field is applied during heat treatment. The main phase of the prepared nanocrystalline powder is α-Fe, α-Fe-Si, α-Fe-Co, on the mosaic amorphous substrate, the main phase has an average grain size of 10nm. The above dimensions a...

Embodiment 3

[0046] Embodiment 3, a soft magnetic powder, the materials used are: Fe: 62%wt, Si: 19%wt, Cu: 2%wt, B: 15%wt, Nb: 2%wt. The process steps adopted are as follows: batching, smelting, powder spraying to obtain powder, embrittlement and stress relief annealing treatment for amorphous powder, and magnetic field heat treatment at the same time to obtain amorphous magnetic powder. The magnetic field heat treatment includes transverse magnetic field heat treatment and longitudinal magnetic field heat treatment. The powder is divided into five grades according to particle size: 25-75 μm, 75-200 μm, 200-500 μm, 500-750 μm, and 750-1200 μm. The soft magnetic powder is subjected to insulation treatment; additives are added, pressed into shape, and heat treated; an insulating layer is sprayed on the surface, and the finished product is obtained after drying. After the crystal of the main phase of the nanocrystalline powder core is made into a magnetic powder core, the crystallization an...

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Abstract

The invention relates to magnetic powder cores of soft magnet and a process of preparation thereof, belonging to the technical field of magnetic material. The magnetic powder cores of soft magnet is made from the following magnetic powders, a principal phase formed by one or a plurality of Fe based, Fe-Si based, Fe-B based, Fe-Si-B based and Fe-Al-B based and an amorphous phase which is inlaid in the principal phase and formed by one or plurality of Fe, C, Cu, Nb, Zr and Hf form nanocrystalline powders, wherein the principal phase is amorphous or in nanocrystalline state with average grain size of 3-100 nm. The prepared magnetic powder has the advantages of low eddy current loss, perfect direct current superposition property, suitable for higher frequency and the like.

Description

technical field [0001] The invention relates to a soft magnetic powder core material and a production method thereof. Background technique [0002] Soft magnetic powder core magnet is a material with high temperature stability, high magnetic flux density, high resistance, low loss and high DC superposition characteristics, so it is widely used in transformers, inductors, communication equipment, filters, computers, electronics It is widely used in fields such as rectifiers and lighting. With the rapid development of communication and information industry technology and the continuous improvement of electronic equipment manufacturing technology, the demand for high-performance high-DC superposition magnetic powder cores in the magnetic component market is increasing. The loss of soft magnetic powder core under alternating field can be basically divided into three categories: hysteresis loss, eddy current loss and dielectric loss. In the manufacturing process of magnetic pow...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/153H01F1/20B22F3/00
Inventor 刘亚丕陈丽莉
Owner CHINA JILIANG UNIV
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