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Soft magnetic composite material and preparation method thereof

A soft magnetic composite material, iron powder technology, applied in the direction of magnetic material, inorganic material magnetism, magnetic object, etc., can solve the problem that the composite material of the organic insulating layer cannot work at high temperature, cannot be subjected to high heat treatment, and the saturation magnetic induction intensity is reduced. and other problems, to achieve the effect of small magnetic performance, high production efficiency, and reduced eddy current loss

Active Publication Date: 2017-05-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this kind of material is also facing many problems. For example, the composite material of the organic insulating layer cannot work at high temperature, or even heat treatment at a higher temperature, and the saturation magnetic induction is greatly reduced due to the intervention of insulating substances.
However, the soft magnetic composite materials with inorganic insulating layers generally have low saturation magnetic induction and low magnetic permeability.
At present, there are many studies on this kind of material, and there are also a large number of related scientific research papers and patents, but in general, there are still many unsolved problems in this kind of material, and there is still room for further improvement in its comprehensive performance. Develop research prospects

Method used

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  • Soft magnetic composite material and preparation method thereof
  • Soft magnetic composite material and preparation method thereof

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Effect test

Embodiment 1

[0025] Put 21g of pure iron powder (particle size 75μm) in 0.5% dilute hydrochloric acid aqueous solution for pickling for 30min, wash the residual liquid on the surface of iron powder with cold water, and obtain 20g of pure iron powder after cleaning; weigh 60g of NaOH dissolved in 400ml of distilled water In, weigh 60gNaNO 2 and 20gK 2 Cr 2 o 7 Dissolve in 40ml of distilled water, pour the mixture of the two into a three-necked flask and heat to boiling, add 20g of cleaned pure iron powder and stir for 180min; leave to cool, filter, and filter the cake in turn with cold water, hot water and absolute ethanol respectively Wash 3 times; put the sample into a vacuum oven and dry at 50°C for 6 hours to obtain 20g of pretreated pure iron powder; mix 20g of pretreated pure iron powder with 0.1g of epoxy resin (model W-6C), 5ml Acetone is mixed and dissolved, after ultrasonic dispersion, it is air-dried in a ventilated place to remove acetone, and then pressed into a ring (18mm O...

Embodiment 2

[0027] Put 21g of pure iron powder (150 μm in particle size) in 1% dilute hydrochloric acid aqueous solution for 15 minutes, wash the residual liquid on the surface of pure iron powder with cold water, and obtain 20 g of pure iron powder after cleaning; weigh 80 g of NaOH and dissolve it in 400 ml of In distilled water, weigh 40g K 4 Fe(CN) 6 Dissolve in 40ml of distilled water, pour the mixture of the two into a three-necked flask and heat to boiling, add 20g of cleaned pure iron powder and stir for 10min; leave to cool, filter, and wash the filter cake in turn with cold water, hot water and absolute ethanol 3 times; put the sample into a vacuum drying oven at 100 ° C for 1 hour to obtain 20 g of pretreated pure iron powder; mix 20 g of pretreated pure iron powder with 0.1 g of epoxy resin (type W-6C), 5 ml of acetone Mix and dissolve, ultrasonically disperse, then air-dry in a ventilated place, let the acetone volatilize completely, and then press into a ring (18mm OD×9mm I...

Embodiment 3

[0029] Pickling 25g sendust powder in 1% dilute hydrochloric acid aqueous solution for 15min, washing the residual liquid on the surface of sendust powder with cold water to obtain 20g washed sendust powder; weigh 5g NaOH and dissolve in 200ml distilled water , weigh 100gNaNO 2and 10gNa 3 PO 4 Dissolve in 40ml of distilled water, pour the mixture of the two into a three-necked flask and heat to boiling, add 20g of cleaned sendust and stir for 120min; leave to cool, filter, and filter the cake with cold water, hot water and absolute ethanol in turn Wash each for 3 times; put the sample in a vacuum drying oven at 50°C and dry for 1 hour to obtain 20 g of pretreated sendust powder; mix and dissolve 20 g of the pretreated sendust powder with 0.1 g of phenolic resin and 5 ml of acetone, and ultrasonically After dispersion, let the acetone volatilize in a ventilated place and then press it into a ring (18mm OD×9mm ID×3mm tall) at 25°C and 1000MPa; heat-treat the ring at 650°C in n...

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Abstract

The invention discloses a soft magnetic composite material and a preparation method thereof. The preparation method of the soft magnetic composite material includes slowly adding cleaned iron powder into boiling alkaline liquor, heating with stirring for 2-180 minutes, cooling, filtering reaction liquid, and washing filter cakes prior to drying so as to obtain treated iron powder; mixing the treated iron powder with a 10 g / L-40 g / L binder and an acetone solution, performing ultrasonic dispersion and natural air drying, pressing a dried product to mould at 600-2000 MPa, and standing in the atmosphere of nitrogen gas and at 400-1000 DEG C for 30-400 minutes so as to obtain the soft magnetic composite material. The preparation method prepares a magnetic oxide insulation coating layer through in-situ reaction of liquid-phase chemistry and is simple in technology, convenient to operate, low in cost, high in production efficiency, environment friendly and suitable for large-scale industrial production.

Description

[0001] (1) Technical field [0002] The invention relates to a soft magnetic composite material and a preparation method thereof. [0003] (2) Background technology [0004] Magnetic materials are widely used in the fields of electronics, computers and communications, and have completely changed our lives today. Different types of magnetic materials including pure iron and its alloys as well as soft and permanent ferrites have been well utilized in the past few decades. With the rapid development of our country's economy, the contradiction between the overexploitation of energy and environmental protection is getting bigger and bigger. Since the beginning of the new century, energy conservation and recycling have become an important way to solve this crisis. For example, when some commonly used electrical equipment such as electric motors are working, a large eddy current phenomenon will be generated between the silicon steel sheets used to manufacture the motor core, and this...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/24B22F1/02
CPCH01F1/14791H01F1/24B22F1/16
Inventor 李旺昌李晶鑫车声雷应耀乔梁郑精武余靓
Owner ZHEJIANG UNIV OF TECH
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