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Material preparation method capable of improving direct current biasing characteristic and preparation method of magnetic powder core

A technology of DC bias and magnetic powder core, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of unspecified magnetic properties of metal soft magnetic powder cores, no obvious improvement of DC characteristics, environmental pollution, etc., and achieve convenient Large-scale industrial manufacturing, good magnetic stability, cost and pollution-free effect

Active Publication Date: 2018-07-03
NBTM NEW MATERIALS GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the patent improves the DC bias performance of the sendust magnetic powder core by adjusting the powder particle size, passivator formula, and insulation coating process, but the results show that the DC characteristics have not been significantly improved, and the passivator used will affect the environment. cause a lot of pollution
In order to be more environmentally friendly, some researchers have abandoned the use of passivating agents and used oxide coating to improve the insulation of sendust magnetic powder particles. The manufacturing method of sendust material with high conductivity "This method uses tetraethyl orthosilicate and ammonia water as raw materials, and uses a sol-gel method to coat a layer of SiO2 insulating layer on the surface of sendust magnetic powder, but in the preparation process Since the magnetic powder is heavy and easy to precipitate, resulting in uneven coating of SiO2 on the surface of the magnetic powder, this insulation coating method is difficult, and the magnetic properties of the prepared metal soft magnetic powder core are not given in the patent

Method used

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  • Material preparation method capable of improving direct current biasing characteristic and preparation method of magnetic powder core
  • Material preparation method capable of improving direct current biasing characteristic and preparation method of magnetic powder core
  • Material preparation method capable of improving direct current biasing characteristic and preparation method of magnetic powder core

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Sieve 700 g of the first sendust magnetic powder with a 140-mesh sieve; sieve 300 g of the second sendust magnetic powder with a 300-mesh sieve.

[0033] (2) Mix the two magnetic powders to obtain a mixed powder, put the mixed powder into a planetary ball mill for ball milling, and the ball milling time is 35 minutes.

[0034] (3) Carry out insulating coating: add the nano-SiO that accounts for 1.5% of the mass percent of mixed powder in the mixed powder after ball milling 2 Powder 15g also adds organic binder solution, the organic binder selected in the organic binder solution is a silane coupling agent, and the silane coupling agent is 70g, accounting for the mass percent of the mixed powder is 7%; The adhesive disperses better, and the dispersing solvent used is 500g acetone; 2 Stir evenly with the mixed powder of the organic binder, and react for 15 minutes to form a magnetic powder slurry. Heat the magnetic powder slurry to 70° C. and keep it warm and keep st...

Embodiment 2

[0046] (1) Sieve 750 g of the first sendust magnetic powder with a 140-mesh sieve; sieve 250 g of the second sendust magnetic powder with a 300-mesh sieve.

[0047] (2) Mix the two magnetic powders to obtain a mixed powder, put the mixed powder into a planetary ball mill for ball milling, and the ball milling time is 25 minutes.

[0048] (3) Carry out insulation coating: add the nanometer Al that accounts for 0.5% of the mass percent of mixed powder in the mixed powder after ball milling 2 o 3 Powder 5g, also add organic binder solution, the organic binder selected in the organic binder solution is organosilicon resin, and silicone resin is 50g, accounts for the mass percent of mixed powder and is 5%; In order to make binder Better dispersion, the dispersion solvent used is 400g acetone; will be mixed with nanometer Al 2 o 3 Stir evenly with the mixed powder of the organic binder, and react for 15 minutes to form a magnetic powder slurry. Heat the magnetic powder slurry to...

Embodiment 3

[0060] (1) Sieve 700 g of the first sendust magnetic powder with a 140-mesh sieve; sieve 300 g of the second sendust magnetic powder with a 300-mesh sieve.

[0061] (2) Mix the two magnetic powders to obtain a mixed powder, put the mixed powder into a planetary ball mill for ball milling, and the ball milling time is 25 minutes.

[0062] (3) Carry out insulating coating: add the nano-SiO that accounts for 1.5% of the mass percent of mixed powder in the mixed powder after ball milling 2 Powder 15g also adds organic binder solution, the organic binder selected in the organic binder solution is a silane coupling agent, and the silane coupling agent is 70g, accounting for the mass percent of the mixed powder is 7%; The adhesive disperses better, and the dispersion solvent used is 400g ethanol; 2 Stir evenly with the mixed powder of the organic binder, and react for 15 minutes to form a magnetic powder slurry. Heat the magnetic powder slurry to 70° C. and keep it warm and keep st...

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Abstract

The invention relates to a material preparation method capable of improving direct current biasing characteristic. The material preparation method is characterized by comprising the following steps: (1) sieving Fe-Si-Al magnetic powder by adopting a sieve with 140 meshes, thus obtaining a first kind of Fe-Si-Al magnetic powder; sieving the Fe-Si-Al magnetic power by adopting a sieve with 300 meshes, thus obtaining a second kind of Fe-Si-Al magnetic powder; (2) mixing the first kind of Fe-Si-Al magnetic powder and the second kind of Fe-Si-Al magnetic powder in a mass ratio of 1.5:4 to obtain amixed powder material, putting the mixed powder material into a ball mill, and carrying out ball milling for 0.25-2.0 hours; and (3) insulating and coating, thus obtaining the coated magnetic powder.The magnetic powder material is simple in preparation technology, environmentally friendly, and the direct current biasing characteristic of the prepared magnetic powder core can be improved.

Description

technical field [0001] The invention relates to the technical field of soft magnetic materials, in particular to a material preparation method for improving DC bias characteristics and a magnetic powder core preparation method. Background technique [0002] Power electronic equipment concentrates more and more functions, and the power consumption per unit area increases exponentially. If this continues, the power supply load will also increase rapidly, which will bring greater losses to various components. The development of today's society requires more and more lightweight and energy-saving devices, so the energy density per unit volume needs to be increased rapidly. As the main component of the switching power supply, the magnetic powder core plays a key role in the power pack. The high DC bias characteristic of the magnetic powder core is one of the guarantees for the high efficiency of the switching power supply. [0003] Metal soft magnetic powder core is a kind of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/24B22F1/00
CPCH01F1/14791H01F1/24B22F1/102
Inventor 聂军武
Owner NBTM NEW MATERIALS GRP
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