A kind of soft magnetic composite material and preparation method thereof

A soft magnetic composite material, lye technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the saturation magnetic induction intensity and permeability decrease, the insulation layer saturation magnetic induction intensity is not high, can not be carried out. High heat treatment and other problems to achieve the effect of reducing loss and forming, conducive to uniform coating and small magnetic properties

Active Publication Date: 2021-03-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials have their own advantages and disadvantages. For example, the composite material of the organic insulating layer cannot work at high temperature, or even heat treatment at a higher temperature.
However, the saturation magnetic induction of the insulating layer in the soft magnetic composite material of the inorganic insulating layer is generally not high and the magnetic permeability is low, so the saturation magnetic induction and magnetic permeability of the material after the inorganic insulating layer is added decrease to a certain extent.
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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  • A kind of soft magnetic composite material and preparation method thereof
  • A kind of soft magnetic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 60gNaOH and 20gNaNO 2 Dissolve in 90ml of distilled water, pour the mixture of the two into a three-necked flask and heat to 140°C, add 20g of pure iron powder and 0.1g of carbon black and stir for 30min, filter, wash the filter cake with hot water until the pH is neutral, and then use absolute ethanol Wash 3 times; put the sample in a vacuum drying oven for 30 minutes at 65°C to obtain 20g of pretreated pure iron powder; grind and mix 20g of pretreated pure iron powder with 0.01g of nickel stearate and 0.01g of oleic acid amide Uniform, then pressed into a ring (12.7mm OD x 7.6mm ID x 3mm tall) at 25°C and 1200MPa; slowly (2°C / min) in a mixed atmosphere of water vapor-nitrogen (water vapor volume content 10%) The temperature is raised to 350° C. for 30 minutes, and then the temperature is raised to 500° C. for 60 minutes to obtain a soft magnetic composite material. Subsequent performance tests were performed on the pressure-wrapped wire. The primary coil and th...

Embodiment 2

[0027] Weigh 60gNaOH and 20gNaNO 2 Dissolve in 90ml of distilled water, pour the mixture of the two into a three-necked flask and heat to 140°C, add 20g of pure iron powder and 0.1g of carbon nanotubes and stir for 30min, filter, wash the filter cake with hot water until the pH is neutral, and then anhydrous Wash with ethanol 3 times; put the sample in a vacuum drying oven and dry at 65°C for 30 minutes to obtain 20 g of pretreated pure iron powder; grind 20 g of pretreated pure iron powder with 0.01 g of zinc stearate and 0.01 g of stearic acid Mix evenly, and then press it into a ring (12.7mm OD×7.6mm ID×3mm tall) at 25°C and 1200MPa; press the ring in a water vapor-nitrogen (water vapor volume content of 15%) mixed atmosphere at 2°C / min The temperature was raised to 200°C for 30 minutes, and then heated to 400°C for 60 minutes to obtain a soft magnetic composite material. Subsequent performance tests were performed on the pressure-wrapped wire. The primary coil and the sec...

Embodiment 3

[0029] Weigh 60gNaOH and 20gNaNO 2Dissolve in 90ml of distilled water, pour the mixture of the two into a three-neck flask and heat to 140°C, add 20g of pure iron powder and 0.1g of graphene and stir for 30min, filter, wash the filter cake with hot water until the pH is neutral, and then use absolute ethanol Wash 3 times; put the sample in a vacuum drying oven for 30 minutes at 65°C to obtain 20g of pretreated pure iron powder; mix 20g of pretreated pure iron powder with 0.01g of zinc stearate, 0.01g of N,N'- Grind and mix ethylene bisstearamide evenly, and then press it into a ring (12.7mm OD×7.6mm ID×3mm tall) at 25°C and 1200MPa; place the pressed ring in a mixed atmosphere of water vapor-nitrogen (water vapor volume content 5%) The temperature was raised at 3°C / min to 300°C for 30 minutes, and then heat treated at 300°C for 60 minutes to obtain a soft magnetic composite material. Subsequent performance tests were performed on the pressure-wrapped wire. The primary coil an...

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Abstract

The invention discloses a soft magnetic composite material and a preparation method thereof. The soft magnetic composite material is formed by uniformly coating magnetic oxides on the surface of the metal powder through a liquid phase chemical process, specifically as follows Preparation: add the metal powder to the constant temperature lye containing carbon powder for pretreatment, filter and dry, add lubricant, press molding, and then conduct heat treatment in a water vapor-nitrogen atmosphere to obtain a soft magnetic composite material. The invention adopts the in-situ generation method to carry out surface treatment on the iron powder or the iron-based alloy to achieve uniform coating, which can greatly improve the magnetic performance of the sample. The composite material of the invention can be widely used in motors, sensors, low frequency filters, electromagnetic driving devices, magnetic field shielding and the like.

Description

technical field [0001] The present invention relates to a soft magnetic composite material and a preparation method thereof, in particular to a method of coating a ferromagnetic insulating layer on the surface of iron-based metal soft magnetic particles through chemical in-situ reaction and then pressing and forming a soft magnetic composite material , The prepared materials can be applied to switching power supplies, motor cores, charger cores, transformer cores, etc. Background technique [0002] Magnetic materials are widely used in the fields of electronics, computers and communications, and have completely changed our lives today. At present, magnetic powder cores are widely used in micro-motors, inductance devices, fast drives and pulse transformers in aviation, automobiles, household appliances and other fields due to their relatively high magnetic flux density, good temperature stability and mechanical shock adaptability. . However, traditional magnetic materials a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00B22F3/02B22F3/24H01F1/147H01F41/02
CPCH01F1/14708H01F1/14766H01F41/0266B22F3/02B22F3/24B22F2003/248B22F2003/023B22F1/14B22F1/10B22F1/16
Inventor 李旺昌浦杨阳车声雷应耀乔梁郑精武余靓
Owner ZHEJIANG UNIV OF TECH
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