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Manufacturing method of mu40 ferrum silicon aluminum magnetic powder core

A manufacturing method and technology of magnetic powder cores, applied to magnetic materials, magnetic objects, and magnetism of inorganic materials, etc., can solve problems such as heat treatment temperature limitations, unfavorable magnetic powder cores, removal, etc., to achieve increased heat treatment temperature, simplified production process, and strong safety Effect

Active Publication Date: 2012-01-04
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 with a vibrating ball mill, and then These powders were placed in a hydrogen reduction furnace at 900°C for 90 minutes for stress relief annealing. According to -80 mesh accounted for 5%, -200 mesh accounted for 70%, -300 mesh accounted for 25% for powder ratio. Mix the proportioned powder evenly, preheat to 120°C, add 9% acid solution for passivation, the acid solution is an aqueous solution of phosphoric acid, urea and glycerin, wherein the ...

Embodiment 2

[0035] 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:

[0036] ⑴10kHz, 1mT, magnetic permeability μ=42.2;

[0037] ⑵Frequency characteristics: The magnetic permeability μ of the magnetic powder core changes less than 0.98% at 1MHz;

[0038] (3) When the magnetic permeability drops by 20%, the DC bias field H=56.1Oe;

[0039] ⑷Magnetic powder core volume ratio loss: 100KHz, 50mT, P cv =337mW / cm 3 .

Embodiment 3

[0041] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 1.5%, 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=41.4;

[0043] ⑵Frequency characteristics: The magnetic permeability μ of the magnetic powder core changes less than 0.99% at 1MHz;

[0044] (3) When the magnetic permeability drops by 20%, the DC bias field H=56.6Oe;

[0045] ⑷Magnetic powder core volume ratio loss: 100KHz, 50mT, P cv =342mW / cm 3 .

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Abstract

l soft magnetic materials and partl soft magnetic materials and particularly relates to a manufacturing method of a soft magnetic ferrum silicon aluminum mu40 magnetic powder core, which comprises the steps of melting, coarse breaking, heat treatment, fine breaking, annealing, powder classification, powder insulating, compression moulding, secondary heat treatment and coating treatment. The soft magnetic ferrum silicon aluminum mu40 magnetic powder core comprises the following components: 9.10 percent of silicon, 5.95 percent of aluminum and the balance of ferrum, and the melting temperature is 1600 DEG C, the forming pressure is 1200-1400MPa, the heat treatment temperature is 600-800 DEG C and the heat insulation time is 1h and a heat treatment atmosphere is a nitrogen-oxygen mixed atmosphere. The soft magnetic ferrum silicon aluminum mu40 magnetic powder core has magnetic conductivity mu of 40+ / -3.2 when the frequency is 10kHz, magnetic conductivity mu change of less than 1 percent under the condition that the frequency is 1MHz, volume ratio loss Pcv100kHz / 50mT of less than or equal to 390mW / cm<3>, and a direct-current bias field H of not less than 55Oe when the magnetic conductivity change is 20 percent. The invention has the advantages that an added adhering agent is a solid inorganic adhering agent; the heat treatment atmosphere is the nitrogen-oxygen mixed atmosphere, thus the cost is lower; and the manufactured magnetic powder core has the characteristics of no pulverization, high strength, stable properties, better direct-current bias property, frequency stability and lower power consumption.

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 μ40 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 -- fine crushing alloy pow...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/24B22F9/08B22F1/00H01F1/147H01F1/20
Inventor 杜海明孙蒋平聂敏申志刚朱小辉许佳辉杜成虎
Owner TDG HLDG CO LTD
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