Preparation method of circle-oriented non-crystal magnetic powder core

A magnetic powder core, amorphous technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of easily destroying the insulating coating, reducing the magnetic permeability of the magnetic powder core, increasing the total loss of the magnetic powder core, etc. Significant anisotropy, increase in permeability, increase in product effect

Active Publication Date: 2015-11-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional amorphous magnetic powder cores are mainly processed through a series of links such as powder screening and particle size ratio, magnetic powder passivation, insulation coating, molding, stress relief annealing, curing treatment, etc. The above-mentioned processes will have the following problems: (1) Since the scaly magnetic powder is in a disordered state, the mutual extrusion between the magnetic powder and the corners of the magnetic powder during the pressing process will easily damage the insulating coating and cause increased eddy current loss; (2) The plane of the magnetic powder is not parallel to the applied magnetic field, resulting in surface Internal eddy currents, resulting in an increase in the total loss of the magnetic powder core; (3) The scaly magnetic powder has the largest demagnetization factor in the direction perpendicular to the applied magnetic field, which will generate the largest demagnetization field, thereby reducing the magnetic permeability of the magnetic powder core

Method used

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  • Preparation method of circle-oriented non-crystal magnetic powder core
  • Preparation method of circle-oriented non-crystal magnetic powder core
  • Preparation method of circle-oriented non-crystal magnetic powder core

Examples

Experimental program
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Effect test

Embodiment 1

[0024] will be composed of Fe 78 Si 9 B 13 The scaly amorphous magnetic powder is sieved and mixed into a powder consisting of 10% of the first powder passing through -100 to +200 mesh, 55% of the second powder passing through -200~+300 mesh and 35% of the third powder passing through -300 mesh Proportioned powder, passivate the proportioned amorphous powder, then dry the powder, add binder and insulating agent to the passivated amorphous powder and mix evenly, among them, the scaly amorphous magnetic powder The dosage is 90% of the total weight of the compound; the insulating coated amorphous magnetic powder is evenly loaded into a non-magnetic permeable mold, and then the mold is placed in a horizontal external magnetic field of 0.8T and vibrated, and then rotated at 45° Rotate the mold, and pre-press and fix the oriented magnetic powder along the circular direction successively, and then place the pre-pressed magnetic powder core in a powder tablet press for pressing at a...

Embodiment 2

[0026] will be composed of Fe 78 Si 9 B 13 The scaly amorphous magnetic powder is sieved and mixed into a powder consisting of 10% of the first powder passing through -100 to +200 mesh, 55% of the second powder passing through -200~+300 mesh and 35% of the third powder passing through -300 mesh Proportioned powder, passivate the proportioned amorphous powder, then dry the powder, add binder and insulating agent to the passivated amorphous powder and mix evenly, among them, the scaly amorphous magnetic powder The dosage is 80% of the total weight of the compound; the insulating coated amorphous magnetic powder is evenly loaded into a non-magnetic permeable mold, and then the mold is placed in a horizontal external magnetic field of 0.5T and vibrated, and then the mold is vibrated at 60° Rotate the mold, and pre-press and fix the oriented magnetic powder along the circular direction successively, and then place the pre-pressed magnetic powder core in a powder tablet press for ...

Embodiment 3

[0028] will be composed of Fe 78 Si 9 B 13 The scaly amorphous magnetic powder is sieved and mixed into a powder consisting of 10% of the first powder passing through -100 to +200 mesh, 55% of the second powder passing through -200~+300 mesh and 35% of the third powder passing through -300 mesh Proportioned powder, passivate the proportioned amorphous powder, then dry the powder, add binder and insulating agent to the passivated amorphous powder and mix evenly, among them, the scaly amorphous magnetic powder The dosage is 95% of the total weight of the compound; the insulating coated amorphous magnetic powder is evenly packed into a non-magnetic permeable mold, and then the mold is placed in a horizontal external magnetic field of 1.0T and vibrated, and then rotated at 30° Rotate the mold, and pre-press and fix the oriented magnetic powder along the circular direction successively, and then place the pre-pressed magnetic powder core in a powder tablet press for pressing at a...

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Abstract

The invention discloses a preparation method of a circle-oriented non-crystal magnetic powder core. The method comprises the following steps: firstly, carrying out passivating treatment on flaky non-crystal soft magnetic powder, and then mixing the flaky non-crystal soft magnetic powder with a binder and an insulating compound evenly; putting the evenly mixed compound into a non-magnetic conductive mold, putting the mold into a horizontally applied magnetic field and vibrating the mold; rotating the mold again at a fixed angle, and carrying out sequential prepressing and fixing on the magnetic powder oriented along the circle direction, and pressing the prepressed magnetic powder core in a powder compressing machine; and finally carrying out stress-relief annealing and solidification treatment on the oriented magnetic powder core. According to the method disclosed by the invention, the adverse effects on the magnetoelectric properties of the non-crystal magnetic powder core caused by the demagnetizing field of the magnetic powder and the eddy current loss in the magnetic powder surface can be effectively removed.

Description

technical field [0001] The invention belongs to the field of preparation of soft magnetic powder cores in functional materials, and in particular relates to a preparation method of ring-oriented amorphous soft magnetic powder cores. Background technique [0002] Amorphous magnetic powder core is a kind of soft magnetic device made by mixing and pressing amorphous magnetic powder and insulating agent. It is widely used in various electronic components such as switching power supply magnetic cores, filters and transformers. Traditional amorphous magnetic powder cores are mainly processed through a series of links such as powder screening and particle size ratio, magnetic powder passivation, insulation coating, molding, stress relief annealing, curing treatment, etc. The above-mentioned processes will have the following problems: (1) Since the scaly magnetic powder is in a disordered state, the mutual extrusion between the magnetic powder and the corners of the magnetic powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153H01F1/20B22F3/03
Inventor 王寅岗郑洋洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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