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Material preparation method for improving DC bias characteristics and magnetic powder core preparation method

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: 2020-07-17
NBTM NEW MATERIALS GRP
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  • Summary
  • 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 for improving DC bias characteristics and magnetic powder core preparation method
  • Material preparation method for improving DC bias characteristics and magnetic powder core preparation method
  • Material preparation method for improving DC bias characteristics and magnetic powder core preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0034] (3) Insulation coating: adding nano-SiO, which accounts for 1.5% by mass of the mixed powder, to the mixed powder after ball milling 2 The powder is 15g, and an organic binder solution is also added. The organic binder selected in the organic binder solution is a silane coupling agent, and the silane coupling agent is 70g, accounting for 7% of the mass of the mixed powder; The binder disperses better, and the dispersing solvent used is 500g acetone; it will be doped with nano-SiO 2 The mixed powder with the organic binder is stirred evenly and reacted for 15 minutes to form a magnetic powder slurry. The magnetic p...

Embodiment 2

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

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

[0048] (3) Insulation coating: add nano-Al which accounts for 0.5% of the mass of the mixed powder to the mixed powder after ball milling 2 O 3 Powder 5g, also add an organic binder solution, the organic binder selected in the organic binder solution is silicone resin, and the silicone resin is 50g, accounting for 5% of the mass of the mixed powder; The dispersion is better, and the dispersing solvent used is 400g acetone; it will be doped with nano-Al 2 O 3 The mixed powder with the organic binder is stirred evenly and reacted for 15 minutes to form a magnetic powder slurry. The magnetic powder slurry was heated to 60...

Embodiment 3

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

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

[0062] (3) Insulation coating: adding nano-SiO, which accounts for 1.5% by mass of the mixed powder, to the mixed powder after ball milling 2 The powder is 15g, and an organic binder solution is also added. The organic binder selected in the organic binder solution is a silane coupling agent, and the silane coupling agent is 70g, accounting for 7% of the mass of the mixed powder; The binder disperses better, and the dispersing solvent used is 400g ethanol; it will be mixed with nano-SiO 2 The mixed powder with the organic binder is stirred evenly and reacted for 15 minutes to form a magnetic powder slurry. The magnetic p...

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Abstract

The material preparation method for improving DC bias characteristics is characterized in that it includes the following steps: (1) sieving sendust magnetic powder with a 140-mesh screen to obtain the first sendust magnetic powder; Sieve the silicon-aluminum magnetic powder to obtain the second sendust magnetic powder; (2) take the mass ratio as the first sendust magnetic powder: the second sendust magnetic powder=1.5~4 and mix the two kinds of magnetic powders to obtain a mixed powder material, put the mixed powder into a ball mill, and ball mill for 0.25 to 2.0 hours; (3) Obtain coated magnetic powder after insulation coating. The preparation process of the magnetic powder material is simple, green and environment-friendly, and can improve the DC bias performance of the prepared magnetic powder core.

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 preparation method of a magnetic powder core. Background technique [0002] Power electronic equipment has more and more centralized functions, and the power consumption per unit area increases exponentially. If this development continues, the power supply load also increases rapidly, which brings greater losses to various components. Today's social development requires more and more stringent lightweight and energy-saving devices, so the energy density per unit volume needs to be rapidly increased. As the main component of the switching power supply, the magnetic powder core plays a key role in the power supply group. The magnetic powder core maintains high DC bias characteristics, which is one of the guarantees for the high efficiency of the switching power supply. [0003] The metal soft...

Claims

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Application Information

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Patent Type & Authority Patents(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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