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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 magnetism of inorganic materials, can solve the problems of poor thermal stability and uneven insulation coating layer, and achieve the effect of excellent coating effect, good oxidation resistance and low temperature

Active Publication Date: 2015-05-27
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 15g of iron powder is sieved for particle size proportioning, weigh 4.0% of the weight of the iron powder Al(NO 3 ) 3 ·9H 2 O, make 400mL Al(NO 3 ) 3 Solution; use glacial acetic acid and CH 3 COONa·3H 2 O was prepared into 400mL of buffer solution with pH=5.0, and iron powder was added to the buffer solution and stirred vigorously to uniformly disperse the iron powder to obtain a suspension; while vigorously stirring, add Al(NO 3 ) 3 Solution, continue to stir for 0.5h, and let stand for 12h at room temperature; Al(OH) is formed 3 The precursor is coated on the surface of the iron powder and calcined at 500oC for 3h; then the coated iron powder is dried at 80oC for 12h; the coated magnetic powder is added to the coated magnetic powder to account for 0.5% of the mass of the coated magnetic powder. The agent is fully stirred under heating until the mixture is dry and evenly mixed. The binder is epoxy resin; 0.5% of the total weight of the coated iron powder is added to...

Embodiment 2

[0033] Pass 20g sendust magnetic powder through a sieve for particle size proportioning, and weigh 3.0% of the weight of the sendust magnetic powder Al(NO 3 ) 3 ·9H 2 O, make 300mL Al(NO 3 ) 3 Solution; use glacial acetic acid and CH 3 COONa·3H 2 O was prepared into 300mL of buffer solution with pH=4.0, the magnetic powder was added to the buffer solution and stirred vigorously to make the magnetic powder uniformly dispersed to obtain a suspension; while vigorously stirring, add Al(NO 3 ) 3 The solution, continue to stir for 20 minutes, stand still at room temperature for 13 hours; then place the coated magnetic powder in a 50oC environment and dry for 20 hours; form Al(OH) 3 The precursor is coated on the surface of the magnetic powder and calcined at 400oC for 5 hours; a binder accounting for 1.5% of the mass of the coated magnetic powder is added to the coated magnetic powder, and the mixture is fully stirred under heating until the mixture is dry and evenly mixed. The binder m...

Embodiment 3

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

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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 method for non-uniform nucleation and insulating coating of metal soft magnetic composite materials. Background technique [0002] The metal soft magnetic composite material is a soft magnetic material that is uniformly pressed by 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, but high temperature heat treatment can also cause the decomposition of the insulating layer and increase the eddy current loss. Therefore, the coating agent with good high temperature stability has gradually become a hot spot of research. Insulation coating is generally divided into organic coating and inorganic coating. The organic coating resin has a low heat resistance temperature and cannot be ...

Claims

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Application Information

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