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Method for manufacturing mu-90 sendust magnetic powder 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. The effect of increasing the heat treatment temperature, eliminating internal stress and stabilizing performance

Active Publication Date: 2012-07-25
TDG HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium dichromate solution is used for passivation, which will produce toxic Cr 6+ , pollute the environment; at present, resin is often used as a binder, and it needs to be dried again after adding resin, and the heat treatment temperature of the magnetic powder core is limited by the characteristics of the resin, and the low heat treatment temperature is not conducive to the removal of internal stress. thermal aging phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put industrial pure iron, crystalline silicon, and pure aluminum into a nominal 150kg medium-frequency induction furnace for melting at 1600°C, cast into an alloy ingot with a chemical composition of 9.10wt% silicon, 5.95wt% aluminum, and the remainder being iron, and crush it by mechanical crushing The alloy blocks are kept in a hydrogen reduction furnace at 1300°C for 2 hours, and then crushed into particles below 5mm with a jaw crusher, and then crushed into powders below 80 mesh by a vibrating ball mill. The powder is placed in a hydrogen reduction furnace at 900°C for 90 minutes for stress relief annealing. According to -100 mesh accounted for 15%, -200 mesh accounted for 70%, -300 mesh accounted for 15% for powder ratio. Mix the proportioned powder evenly, preheat to 120°C, add an acid solution with 4% alloy powder mass for passivation, the acid solution is an aqueous solution of phosphoric acid, urea and glycerin, where phosphoric acid: urea: glycerin: water The...

Embodiment 2

[0038] 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:

[0039] ⑴10kHz, 1mT, magnetic permeability μ=94.1;

[0040] (2) The external DC magnetic field is 100Oe, and the permeability change rate is 74.3%;

[0041] ⑶ Volume loss: 50kHz, 50mT, P cv =95.8mW / cm 3 .

Embodiment 3

[0043] According to the process steps of Example 1, the mass ratio of the binder is adjusted to 0.8%, and the rest of the process conditions remain unchanged. The magnetic properties of the prepared magnetic powder core are as follows:

[0044] ⑴10kHz, 1mT, magnetic permeability μ=92.4;

[0045] (2) The external DC magnetic field is 100Oe, and the permeability change rate is 73.2%;

[0046] ⑶ Volume loss: 50kHz, 50mT, P cv =97.8mW / cm 3 .

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Abstract

The invention provides a method for manufacturing mu-90 sendust magnetic powder cores, which comprises the steps of smelting, coarse crushing, heat treatment, fine crushing, annealing treatment, powder grading, powder insulation, compression molding, secondary heat treatment and coating treatment. The mu-90 sendust magnetic powder cores comprise binary iron-silicon alloy with added aluminum, wherein the silicon content accounts for 9-10%, the aluminum content accounts for 5-6%, and the balance is iron. The smelting temperature is 1600 DEG C. The compression molding pressure is 1900 MPa. The heat treatment temperature is 600-800 DEG C, the holding time is 1 hour, and the nitrogen-oxygen mixed atmosphere is adopted. When f=10 kHz and B=1 mT, mu=90+ / -7.2; when f=50 kHz and B=50 mT, the volume ratio loss Pcv<=100mW / cm3. When an additional direct current bias magnetic field is 100 Oe, the change rate of the magnetic conductivity is not greater than 75%. The method for manufacturing the mu-90 sendust cores has the advantages that an added bonding agent is a solid inorganic bonding agent, the heat treatment after the molding is performed in the nitrogen-oxygen mixed atmosphere environment and subjected to heat preservation for 1 hour. Prepared magnetic powder cores are not prone to pulverize, high in strength and stable in performance and have good direct current biasing characteristic, frequency stabilization characteristic and low loss.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for manufacturing a soft magnet silicon aluminum μ90 magnetic powder core. Background technique [0002] The sendust magnetic powder core has a high Bs, which can achieve higher inductance under the same volume, so as to reduce the volume of the device, and the bias curve has quasi-linear characteristics, so that the magnetic core has soft package and characteristics; uniformly distributed gas The gap can avoid local loss; it also has good temperature characteristics and mechanical shock resistance. Since the sendust magnetic powder core has the above advantages, it becomes the material of choice for magnetic cores used in switching power supplies and filters. [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 cr...

Claims

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Application Information

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