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Method for making soft magnet silicon aluminium alloy powder core

A technology of sendust and silicon-aluminum alloy, which is applied in the manufacturing field of soft magnetic inductance iron core, can solve the problems of AC and DC superimposed drop performance and small magnetic permeability that do not involve the powder core, and achieve low cost and easy production , strong security effect

Inactive Publication Date: 2005-11-30
ZHEJIANG KEDA MAGNETOELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have solved some specific problems in the production process of the soft magnetic silicon-aluminum alloy powder core from a certain angle, their magnetic permeability is still relatively small, and none of them involve the drop performance of the powder core with AC and DC superposition

Method used

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  • Method for making soft magnet silicon aluminium alloy powder core
  • Method for making soft magnet silicon aluminium alloy powder core
  • Method for making soft magnet silicon aluminium alloy powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put industrial pure iron, crystalline silicon, and pure aluminum into a high-frequency induction furnace with a nominal value of 50 kg for smelting, and cast it into an alloy ingot with a chemical composition of 84.80% iron, 9.53% silicon, and 5.62% aluminum, and mechanically cast the alloy ingot Coarsely crushed into chunks below 25mm, put these chunks into a general reduction furnace with a hydrogen protective atmosphere and keep them warm for about 2 hours at a temperature of about 1200°C, then cool them down, and then use a jaw crusher to further crush them The material block is broken into a material block smaller than 6 mm, and then crushed into an alloy powder below 100 mesh by a vibrating ball mill. The alloy powder is placed in a general reduction furnace with a hydrogen protective atmosphere and kept at a temperature of about 900 ° C for 1 hour. Stress annealing treatment, after sieving, according to the mass ratio of 100-200 mesh accounting for 20%, 200-325 me...

Embodiment 2

[0027] According to the processing step of embodiment one, the glue solution (that is, W-6A or W-6C magnetic powder adhesive equivalent to 2.0% of the alloy powder quality) that is equivalent to 6.0% of the alloy powder quality is poured into the alloy powder, and all the other conditions No change, get a soft magnetic powder core with the specifications of Φ12.80 / Φ7.20×5.0. Its magnetic performance parameters are shown in Table 4 and Table 5:

[0028] Table 4

[0029]

[0030] Quality factor Q

28.0

40.3

31.3

26.2

21.9

Inductance factor A L (nH / N 2 )

60.1

[0031] The data in Table 4 shows that the inductance factors of samples 5, 6, 7, and 8 are basically in A L =56×(1±8%)nH / N 2 In the range of , the corresponding effective permeability (μ e ) is about 125, which is higher than the performance of the soft magnetic powder core manufactured by the existing method.

[0032] Table 5 (DC superposition result ...

Embodiment 3

[0036] According to the processing step of embodiment one, the glue solution (that is, W-6A or W-6C magnetic powder adhesive equivalent to 3.0% of the alloy powder quality) that is equivalent to 9.0% of the alloy powder quality is poured into the alloy powder, and all the other conditions No change, get a soft magnetic powder core with the specifications of Φ12.80 / Φ7.20×5.0. Its magnetic performance parameters are shown in Table 6 and Table 7:

[0037] Table 6

[0038]

[0039] Quality factor Q

25.7

48.5

40.4

35.0

28.0

Inductance factor A L (nH / N 2 )

53.9

[0040] The data in Table 6 shows that the inductance factors of samples 9, 10, 11, and 12 are basically in A L =56×(1±8%)nH / N 2 In the range of , the corresponding effective permeability (μ e ) is about 125, which is higher than the performance of the soft magnetic powder core manufactured by the existing method.

[0041] Table 7 (DC superposition result...

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Abstract

The invention provides method to make a soft-magnetic inductance iron core by Fe-Si-Al alloy powder, including the steps: smelting Fe-Si-Al alloy - roughly crushing the cast ingot - heat treating - finely crushing into powder - annealing - grain mixing - passivating - adding insulating, binder, and mould-release agent - die forming - heat treating -coating surface. Its character: the binder is an epoxy one; the tempering after die forming is preserving the heat of the formed alloy powder at least 30 min on the condition of 600-800 deg.C nitrogen gas, argon gas or vacuum.

Description

【Technical field】 [0001] The invention belongs to a method for manufacturing a magnetic object—especially a method for manufacturing a soft magnetic inductance iron core molded from sendust powder. This soft magnetic inductance iron core is mainly suitable for making an inductance iron for a stable converter on a switching power supply. core, low noise filter and pulse transformer core, etc. 【Background technique】 [0002] At present, with the development of the electronics industry, various switching power converters, inverters, inverters, etc. have been applied to the magnetic permeability (μ e ) of pure iron soft magnetic powder cores below 75, but pure iron soft magnetic powder cores have the disadvantages of low magnetic permeability and large temperature coefficient, and it is gradually difficult to meet the requirements of technological development; while nickel-iron magnetic powder with high magnetic permeability The raw materials of the core are expensive and the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/00H01F1/22
Inventor 刘善宜祝家贵柯昕
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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