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Method for manufacturing mu 125 sendust cores

A manufacturing method and technology of magnetic powder cores, which are applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, and magnetic properties of inorganic materials, etc., can solve the problems of unfavorable magnetic powder cores, heat treatment temperature limitation, removal, etc., to simplify the production process, The effect of increasing the heat treatment temperature and eliminating internal stress

Active Publication Date: 2012-08-01
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

[0027] Industrial pure iron, crystalline silicon, and pure aluminum are put into a medium-frequency induction furnace with a nominal weight of 150kg and melted at 1600°C, cast into an alloy ingot with a chemical composition of 84.90% iron, 9.10% silicon, and 5.95% aluminum, and crush it into 20% by mechanical crushing. Blocks of materials below 1 mm and alloy blocks are kept in a hydrogen reduction furnace at 1300 ° C for 2 hours, and then crushed into particles below 5 mm with a jaw crusher, and then crushed into powders below 80 mesh with a vibrating ball mill, and then these powders are Place in a hydrogen reduction furnace at 900°C for 90 minutes for stress relief annealing. According to -100 mesh accounted for 30%, -200 mesh accounted for 55%, -300 mesh accounted for 15% for 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 phosphoric acid, urea and g...

Embodiment 2

[0034] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 0.7%, and the rest of the process conditions remain unchanged. The magnetic properties of the prepared magnetic powder core are as follows:

[0035] ⑴10kHz / 1mT, magnetic permeability μ=122.3;

[0036] ⑵Frequency characteristics:

[0037] f(kHz) 10 100 200 300 400 500 mu 122.3 122.2 121.6 120.9 120.3 119.7 f(kHz) 600 700 800 900 1000 　 mu 119.1 118.5 118.0 117.5 117.0 　

[0038] (3) When the magnetic permeability drops to 50%, the DC bias field is H=42.0Oe;

[0039] ⑷Magnetic powder core volume ratio loss: at 100kHz / 50mT, P cv =178mW / cm 3 .

Embodiment 3

[0041] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 0.3%, and the rest of the process conditions remain unchanged. The magnetic properties of the prepared magnetic powder core are as follows:

[0042] ⑴10kHz / 1mT, magnetic permeability μ=126.5;

[0043] ⑵Frequency characteristics:

[0044] f(kHz) 10 100 200 300 400 500 mu 126.5 126.4 125.8 125.1 124.4 123.8 f(kHz) 600 700 800 900 1000 　 mu 123.2 122.6 122.1 121.6 121.1 　

[0045] (3) When the magnetic permeability drops to 50%, the DC bias field is H=40.8Oe;

[0046] ⑷Magnetic powder core volume ratio loss: at 100kHz / 50mT, P cv =174mW / cm 3 .

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PUM

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Abstract

The invention relates to a method for manufacturing mu 125 sendust cores. The method comprises the steps of alloy smelting, coarse crushing, heat treatment, fine crushing, annealing treatment, powder classification, powder insulation, compression moulding, secondary heat treatment and coating treatment. The mu 125 sendust cores comprise the following compositions: 9.10 percent of silicon, 5.95 percent of aluminum and the balance of iron; the sendust cores are smelted at 1,600DEG C, molded under the pressure of between 1,950 and 2,150MPa, subjected to heat treatment at the temperature of between 600 and 800DEG C, kept at the temperature for 30min, and subjected to heat treatment under the protection of nitrogen. The magnetic permeability mu of the sendust cores is equal to 125+ / -10 (10kHz / 1mT); the mu change rate in 1 MHz is less than 5%; Pcv is less than or equal to 190 mW / cm<3> (100kHz / 50mT); and the applied direct current bias field H is not less than 390e when the mu is 50%. A passivating solution does not contain chromium ions, which is environment-friendly; and an insulation layer between powder of the sendust cores has a glass phase structure containing P, which has high temperature for heat treatment and contributes to eliminating internal stress and reducing iron loss. A solid inorganic binder is adopted, so the adhesive strength is high, the performance is stable, and the process is simplified.

Description

technical field [0001] The invention belongs to the field of metal soft magnetic material manufacturing, in particular to a method for manufacturing a soft magnetic silicon aluminum μ125 magnetic powder core. 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 Temperature characteristics, frequency characteristics and mechanical shock resistance. The main application circuit of μ125 sendust magnetic powder core is the BOOST power supply circuit for suppressing the harmonics of the power grid, the AC-DC power supply output filter circuit, etc. [0003] At present, the manufacturing method of sendust magnetic powder core includes: smelting of sendust aluminum alloy --- coarse crushing of sendus...

Claims

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Application Information

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IPC IPC(8): H01F1/22H01F41/02H01F3/00B22F3/16B22F1/02B22F9/04
Inventor 许佳辉柏海明朱小辉聂敏
Owner TDG HLDG CO LTD
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