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Inhomogeneous nucleation insulation coating processing method of metal soft magnetic composite material

A technology of non-uniform nucleation and composite materials, applied in the direction of magnetic properties of inorganic materials, can solve the problems of non-uniform insulation coating and poor thermal stability, and achieve controllable coating thickness, excellent coating effect, and easy batching. production effect

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at defects such as uneven insulating coating layer and poor thermal stability of current soft magnetic composite materials, the present invention provides a non-uniform nucleation insulating coating treatment method for metal soft magnetic composite materials. The technical scheme of the present invention is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After sieving 15g of iron powder for particle size ratio, weigh 4.0% of the iron powder weight Al(NO 3 ) 3 9H 2 O, use distilled water to make 400mL of Al(NO 3 ) 3 solution; with glacial acetic acid and CH 3 COONa·3H 2 O to make 400mL of buffer solution with pH=5.0, add iron powder into the buffer solution and stir vigorously to disperse the iron powder evenly to obtain a suspension; while stirring vigorously, add Al(NO 3 ) 3 solution, continue to stir for 0.5h, and stand at room temperature for 12h; form Al(OH) 3 The precursor was coated on the surface of the iron powder and calcined at 500oC for 3h; then the coated iron powder was dried at 80oC for 12h; 0.5% of the mass of the coated magnetic powder was added to the coated magnetic powder agent, fully stirred under heating conditions until the mixture is dry and uniformly mixed, the binder is epoxy resin; add molybdenum disulfide accounting for 0.5% of the total weight of the coated iron powder to the coated ir...

Embodiment 2

[0033] Sieve 20g sendust magnetic powder for particle size ratio, weigh 3.0% Al(NO 3 ) 3 9H2 O, use distilled water to make 300mL of Al(NO 3 ) 3 solution; with glacial acetic acid and CH 3 COONa·3H 2 O to make 300mL buffer solution with pH=4.0, add magnetic powder into the buffer solution and stir vigorously to disperse the magnetic powder evenly to obtain a suspension; while stirring vigorously, add Al(NO 3 ) 3 Solution, continue to stir for 20min, and let it stand at room temperature for 13h; then place the coated magnetic powder in an environment of 50oC and dry for 20h; form Al(OH) 3 The precursor was coated on the surface of the magnetic powder, and calcined at 400oC for 5h; a binder accounting for 1.5% of the mass of the coated magnetic powder was added to the coated magnetic powder, and the mixture was fully stirred under heating conditions until the mixture was dry and evenly mixed. The binder described above is phenolic resin; add a release agent accounting for ...

Embodiment 3

[0040] Sieve 10g of iron-nickel magnetic powder (the mass content of iron and nickel is 50% each) for particle size ratio, and weigh 2.5% of the weight of the iron-nickel magnetic powder. 3 ) 3 9H 2 O, use distilled water to make 500mL Al(NO 3 ) 3 solution; with glacial acetic acid and CH 3 COONa·3H 2 O to make 500mL of buffer solution with pH=4.5, add the magnetic powder into the buffer and stir vigorously to disperse the magnetic powder evenly to obtain a suspension; while stirring vigorously, add Al(NO 3 ) 3 Solution, continue to stir for 40min, and let it stand at room temperature for 15h; then place the coated magnetic powder in an environment of 100oC and dry for 10h; form Al(OH) 3 The precursor was coated on the surface of the magnetic powder, and calcined at 700oC for 2 hours; a binder accounting for 2.5% of the mass of the coated magnetic powder was added to the coated magnetic powder, and the mixture was fully stirred under heating conditions until the mixture ...

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Abstract

The invention discloses an inhomogeneous nucleation insulation coating processing method of a metal soft magnetic composite material. The method includes the following steps that (1) particle size distribution is conducted on metal magnetic powder after sieving is conducted; (2) insulation coating is conducted on the distributed metal powder through an inhomogeneous nucleation method, and then the metal powder is dried; (3) the dried magnetic powder and a binding agent are evenly fixed, a release agent is added to conduct dry pressing and forming, and the mixture is pressed to form blank samples; (4) heat preservation is conducted on the blank samples for half an hour to two hours in a protective atmosphere, and air cooling and spray coating are conducted to obtain the target product. The composite powder prepared through the inhomogeneous nucleation method is even and compact in coating and controllable in coating layer thickness, and has high oxidation resistance, high resistivity, high saturation magnetization intensity, the good magnetic property and the good mechanical property; the surface of the metal magnetic powder is evenly coated with an A12O3 insulation layer through the inhomogeneous nucleation method, so that the coating effect is superior to that of an existing method, the operability is high and volume production is facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic materials, in particular to a non-uniform nucleation insulation coating treatment method for metal soft magnetic composite materials. Background technique [0002] The metal soft magnetic composite material is a soft magnetic material formed by uniformly pressing ferromagnetic particles coated with an insulating medium. In the preparation process of magnetic powder cores, high-temperature annealing treatment can effectively reduce residual stress and defects, thereby reducing hysteresis loss. However, high-temperature heat treatment will also cause the decomposition of the insulating layer and increase eddy current loss. Therefore, the coating agent with good high temperature stability has gradually become a research hotspot. Insulation coating is generally divided into organic coating and inorganic coating. The heat-resistant temperature of the organic coating resin is low, so i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F1/24
Inventor 严密刘冬吴琛张念伟
Owner ZHEJIANG UNIV
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