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Composite binder and method for preparing soft magnetic composite material by using same

A soft magnetic composite material and binder technology, which is applied in the fields of inorganic material magnetism, metal processing equipment, inductor/transformer/magnet manufacturing, etc. problems, to achieve the effect of reducing the number of defects, optimizing the mechanical strength, and improving the mechanical strength

Active Publication Date: 2020-11-03
山东精创磁电产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual situation is that it is difficult to completely dewax during the heat treatment process due to the suppression of the green body density, resulting in uneven distribution of the oxidation strengthening layer in the magnet, which limits the increase in mechanical strength.

Method used

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  • Composite binder and method for preparing soft magnetic composite material by using same
  • Composite binder and method for preparing soft magnetic composite material by using same
  • Composite binder and method for preparing soft magnetic composite material by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing a soft magnetic composite material, comprising:

[0035] Step 1: Preparation of composite binder: make a 1:10 solution of silicone resin and acetone, mix the two evenly by ultrasonic vibration treatment, and then put 2wt% carbon nanotubes of silicone resin, in which carbon The length of the nanotubes is 200nm-1μm; the diameter is 10-50nm; ultrasonic shock treatment for 1 hour, stirring at room temperature for 2 hours to disperse the carbon nanotubes evenly in the solution to obtain a composite binder;

[0036] Step 2: Iron powder pretreatment: water atomized iron powder, purity requirement > 99.9%, iron powder particle size 180-250μm; mechanical ball milling pretreatment and ultrasonic cleaning on iron powder to improve the surface of iron powder to coating agent Absorptivity; the parameters of ball milling are: the speed of ball mill is 300-600 rpm, the ratio of ball to material is 2:1-6:1, and the pretreatment time is 5-10 minutes; after that, a...

Embodiment 2

[0041] A method for preparing a soft magnetic composite material, wherein step 5 specifically includes: placing the pressed blank block in an annealing furnace, vacuumizing the furnace chamber and then filling it with nitrogen to stabilize it to 0.04MPa, and increasing the temperature at a rate of 15°C / min. Heat at a rate of 380°C for 60 minutes, then cool to room temperature; then heat up to 450°C at a rate of 15°C / min after feeding nitrogen gas, then pass in water vapor, and reduce the temperature rise rate to 5°C / min The temperature was raised to 520° C., and after 35 minutes of heat preservation, nitrogen gas was introduced to start cooling down. After the furnace temperature was cooled to room temperature, the sample was taken out; other conditions were the same as in Example 1.

Embodiment 3

[0043] A method for preparing a soft magnetic composite material, wherein step 5 specifically includes: placing the pressed blank block in an annealing furnace, vacuumizing the furnace chamber and then filling it with nitrogen to stabilize it to 0.04MPa, and increasing the temperature at a rate of 15°C / min. Heat at a rate of 400°C and hold for 60 minutes; then carry out a second temperature rise, heating to 450°C at a rate of 15°C / min, then start to feed water vapor, reduce the rate of temperature rise to 5°C / min and raise to 520°C, hold for 35 minutes Feed into nitrogen to start cooling afterward, and take out sample after furnace temperature is cooled to room temperature; All the other conditions are identical with embodiment 1.

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Abstract

The invention relates to a composite binder and a method for preparing a soft magnetic composite material by using the same, and belongs to the technical field of soft magnetic material preparation. The composite binder is prepared by the following method including the steps of firstly, preparing an acetone solution of organic silicon resin, then adding carbon nanotubes accounting for 1%-5% of theweight of the organic silicon resin, and uniformly dispersing the carbon nanotubes in the acetone solution of the organic silicon resin through ultrasonic oscillation and mechanical stirring to formthe composite binder. Organic silicon resin molecules in the composite binder are adhered to the surfaces of the carbon nanotubes to form a net-shaped structure, and after coating with the composite binder, a net-shaped coating structure can be formed on the surface of iron powder, so that the volatility of the composite binder and a lubricating agent adhered to the net-shaped structure during annealing can be obviously reduced, a diffusion channel is provided for steam to enter a magnet, organic matters can be more effectively removed, a uniform and complete oxidation strengthening layer is formed, and the mechanical strength of the SMC magnet is greatly improved.

Description

technical field [0001] The invention relates to the technical field of soft magnetic material preparation, and specifically provides a composite binder and a method for preparing soft magnetic composite materials using the same. Background technique [0002] Soft magnetic composite materials (SMC materials for short) can achieve high resistivity and low loss by coating the surface of each iron powder particle with a high-resistivity insulating coating layer. These high-resistivity insulating layers are equivalent to magnets. Evenly distributed air gaps. Different from the laminated silicon steel sheets in the laminated structure, this uniformly distributed air gap in the magnet brings good magnetocaloric three-dimensional isotropy to the SMC material, which makes the two-dimensional magnetic circuit structure made of laminated silicon steel sheets For magnetic devices such as motor stators and reactors, new three-dimensional magnetic circuit structures can be designed by us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F3/10B22F3/24H01F1/26H01F41/02
CPCB22F3/1021B22F3/24H01F1/26H01F41/02B22F2003/248B22F1/102B22F1/103B22F1/145
Inventor 梁丽萍孙蕾邵国庆吴玉明刘琪任晓琳
Owner 山东精创磁电产业技术研究院有限公司
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