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Preparing method and application of high-strength soft magnetic composite material

A soft magnetic composite material, high-strength technology, applied in the direction of inorganic material magnetism, mechanical equipment, bearings, etc., can solve the problems of low mechanical strength, large eddy current loss, low magnetic performance, etc. high intensity effect

Active Publication Date: 2015-12-09
宁波合荣磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a high-strength soft magnetic composite material to overcome the problems of existing soft magnetic composite materials with many holes, large eddy current loss, low magnetic properties and low mechanical strength

Method used

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  • Preparing method and application of high-strength soft magnetic composite material
  • Preparing method and application of high-strength soft magnetic composite material
  • Preparing method and application of high-strength soft magnetic composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A method for preparing a high-strength soft magnetic composite material, comprising the following steps:

[0050] Step 1, processing iron powder

[0051] Prepare 1000g of pure iron powder first, requiring the purity of the pure iron powder to be 99.99wt%, and the iron particle size to be 60-120 μm; then dissolve the pure iron powder in an acetone solution with a concentration of 99.9wt% for degreasing, and use Stir with a spiral stirrer for 10 minutes and repeat 3 times to achieve the purpose of degreasing; then filter out the iron powder, wash the iron powder and wait for the acetone to volatilize completely, then place it in a vacuum furnace to dry at a temperature of 60°C;

[0052] Step 2, passivating iron powder

[0053] The dried iron powder and NaNO 2 The alkaline solution was mixed and stirred for 30min at a stirring speed of 300r / min, NaNO 2 The pH value of the alkaline solution before mixing is 8.0, and the pH value of the mixture rises during the stirring p...

Embodiment 2

[0066] A method for preparing a high-strength soft magnetic composite material, comprising the following steps:

[0067] Step 1, processing iron powder

[0068] Prepare 1000g of pure iron powder first, requiring the purity of the pure iron powder to be 99.99wt%, and the iron particle size to be 60-120 μm; then dissolve the pure iron powder in an acetone solution with a concentration of 99.9wt% for degreasing, and use Stir with a spiral stirrer for 12 minutes and repeat 3 times to achieve the purpose of degreasing; then filter out the iron powder, wash the iron powder and wait for the acetone to volatilize completely, then place it in a vacuum furnace and dry it at a temperature of 58°C;

[0069] Step 2, passivating iron powder

[0070] The dried iron powder and NaNO 2 Alkaline solution mixed, and stirred at a stirring speed of 300r / min for 20min, NaNO 2 The pH value of the alkaline solution before mixing is 8.0, and the pH value of the mixture rises during the stirring proc...

Embodiment 3

[0083] A method for preparing a high-strength soft magnetic composite material, comprising the following steps:

[0084] Step 1, processing iron powder

[0085] Prepare 1000g of pure iron powder first, requiring the purity of the pure iron powder to be 99.99wt%, and the iron particle size to be 60-120 μm; then dissolve the pure iron powder in an acetone solution with a concentration of 99.9wt% for degreasing, and use Stir with a spiral stirrer for 15 minutes and repeat 3 times to achieve the purpose of degreasing; then filter out the iron powder, wash the iron powder and wait for the acetone to evaporate completely, then place it in a vacuum furnace to dry at a temperature of 50°C;

[0086] Step 2, passivating iron powder

[0087] The dried iron powder and NaNO 2 mixed alkaline solution, and stirred at a stirring speed of 300r / min for 15min, NaNO 2 The pH value of the alkaline solution before mixing is 8.0, and the pH value of the mixture rises during the stirring process a...

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Abstract

The invention provides a preparing method of a high-strength soft magnetic composite material. According to the method, Fe with a great reserve volume is selected to be used as a magnetic powder material, so that the cost of the raw material is low; a liquid phase reducing method is used for obtaining passivated iron powder; then, a high-energy ball mill is used for performing ball milling on high-purity magnesium oxide powder; particles with the granularity being 80nm to 100nm are obtained; then, the passivated iron powder and the refined magnesium oxide powder are uniformly mixed by a mechanical mixing method; and the high-strength soft magnetic composite material is obtained through pressing and heat treatment. The prepared soft magnetic composite material has the advantages of high resistivity, small eddy current loss, few hole defects and high strength. The high-strength soft magnetic composite material is applied to a stator and a thrust disc of an electromagnetic thrust bearing.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and in particular relates to a preparation method and application of a high-strength soft magnetic composite material. Background technique [0002] The development of modern science and technology requires magnetic materials to have the characteristics of high magnetic permeability, high resistivity, low coercive force, low loss, low magnetic anisotropy coefficient, design and processing flexibility, etc., so the thickness of soft magnetic sheet materials is required Thin and high resistivity, and minimize the effect of the rapid decrease of magnetic permeability with increasing frequency. Traditional soft magnetic materials such as pure iron, silicon steel, permalloy, etc. have excellent magnetic properties, but their resistivity is low, resulting in a large eddy current loss under the action of an alternating magnetic field; while soft magnetic ferrite materials have good magne...

Claims

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Application Information

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IPC IPC(8): C22C33/02H01F1/33F16C32/04
Inventor 肖玲李明刘刚
Owner 宁波合荣磁业有限公司
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