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Preparation method for mu75 magnetic powder core of ferrosilicon aluminum

A manufacturing method and magnetic powder core technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic core/yoke, inorganic material magnetism, etc., can solve the problems of unfavorable magnetic powder core, heat treatment temperature limit, removal, etc., to simplify the production process, Increased heat treatment temperature and strong safety effects

Active Publication Date: 2014-06-11
TDG HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resin is used as binder at home and abroad, and it needs to be dried again after adding, and the heat treatment temperature of the magnetic powder core is limited by the characteristics of the binder used, which is not conducive to the removal of the internal stress of the magnetic powder core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put industrial pure iron, crystalline silicon, and pure aluminum into a medium-frequency induction furnace with a nominal weight of 150kg for melting at 1600°C, and cast it into an alloy ingot with a chemical composition of 9.10wt% silicon, 5.95wt% aluminum and the balance being iron, and use mechanical crushing method Crushed into pieces below 20mm, the alloy pieces were kept in a hydrogen reduction furnace at 1300°C for 2 hours, then crushed into particles below 5mm with a jaw crusher, and then crushed into powders below 80 mesh by a vibrating ball mill. These powders were placed in a hydrogen reduction furnace at 900°C for 90 minutes for stress relief annealing. According to -100 ~ +200 mesh accounted for 10%, -200 ~ +300 mesh accounted for 70%, -300 mesh accounted for 20% to carry out the powder ratio. Mix the proportioned powder evenly, preheat to 120°C, add an acid solution with 6% alloy powder mass to passivate, the acid solution is an aqueous solution of phospho...

Embodiment 2

[0036] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 0.6%, and the rest of the process conditions remain unchanged. The magnetic properties of the prepared magnetic powder core are as follows:

[0037] ⑴100kHz, 1mT, magnetic permeability μ=72.5;

[0038] ⑵Frequency characteristics:

[0039] f(kHz)

10

100

200

300

500

700

1000

mu

72.53

72.50

72.46

72.44

72.38

72.31

72.29

[0040] (3) When the magnetic permeability drops to 50%, the DC bias field is H=74Oe;

[0041] ⑷Magnetic powder core volume ratio loss: 50kHz, 50mT, P cv =95.3mW / cm3.

Embodiment 3

[0043] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 1.0%, and the rest of the process conditions remain unchanged. The magnetic properties of the prepared magnetic powder core are as follows:

[0044] (1) 100kHz, 1mT, magnetic permeability μ=71.8;

[0045] ⑵Frequency characteristics:

[0046] f(kHz)

10

100

200

300

500

700

1000

mu

72.53

72.50

72.46

72.44

72.38

72.31

72.29

[0047] (3) When the magnetic permeability drops to 50%, the DC bias field is H=76Oe;

[0048] ⑷Magnetic powder core volume ratio loss: 50kHz, 50mT, P cv =96.2mW / cm 3 .

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PUM

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Abstract

The invention belongs to the field of preparation of metallic soft magnetic materials, and particularly relates to a preparation method for a mu75 magnetic powder core of soft magnetic ferrosilicon aluminum, which includes steps of smelting, rough smashing, heat treatment, fine smashing, annealing treatment, powder grading, powder insulating, compression molding, secondary heat treatment and coating treatment and requires components, by weight, 9.10% of silicon, 5.95% of aluminum and the rest iron. The preparation is performed with the smelting temperature of 1600 DGE C, the compression molding pressure ranging from 1700MPa to 2000Mpa, magnetic powder core pressing temperature ranging from 600 DEG C to 800 DEG C, and one hour for warm keeping in a nitrogen-oxygen mixed atmosphere. The magnetic powder core mu=75+-6 at 100kHz, the magnetic conductivity mu is smaller than 1% in variation under 1000kHz, the magnetic powder core loss is accordant to Pcv (powder loss) 50kHZ / 50mT<=100Mw / cm3, and the direct-current bias magnetic field is not lower than 70Oe when the magnetic conductivity is reduced to 50%. The preparation method for the mu75 magnetic powder core of soft magnetic ferrosilicon aluminum has the advantages that added binder is solid organic binder, the heat treatment after molding includes keeping warm for one hour in the nitrogen-oxygen mixed atmosphere, and the prepared magnetic powder core is free of pulverization, high in strength and stable in performance and has fine direct current bias characteristics, frequency stability and low loss.

Description

technical field [0001] The invention belongs to the field of metal soft magnetic material manufacturing, in particular to a method for manufacturing soft magnetic silicon aluminum μ75 magnetic powder cores. Background technique [0002] The sendust magnetic powder core has a high Bs, which can achieve higher inductance under the same volume. At the same time, the bias curve has quasi-linear characteristics so that the magnetic core is not easy to enter the saturation state; the uniform distribution of the air gap can avoid local loss; good Excellent temperature characteristics and mechanical shock resistance. Since the sendust magnetic powder core has the above advantages, it becomes the preferred material for switching power supply and filter magnetic core. [0003] At present, the manufacturing method of sendust magnetic powder core includes: smelting of sendust aluminum alloy - coarse crushing of sendust aluminum alloy ingot - heat treatment - finely crushed alloy powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/22H01F41/02H01F3/00B22F3/16B22F1/02B22F9/04
Inventor 朱小辉聂敏孙蒋平申志刚柏海明杜成虎许佳辉
Owner TDG HLDG CO LTD
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