A kind of preparation method of magnetic material

Abstract

The invention relates to a preparation method of composite soft magnetic material. The raw materials of the preparation method are composed of sheet soft magnetic alloy, an insulating medium, a solvent, a dispersing agent and an adhesive. The preparation method comprises the specific steps of mixing and ball-milling the soft magnetic alloy, insulating medium, solvent and dispersing agent for 5-30h; then adding the adhesive, continuously ball-milling for 0.5-10h, and vacuum-degassing to acquire disperse slurry; injecting the disperse slurry into a casting machine, wherein the height of a scraper is 10-500 microns, the speed of the casting machine is controlled to be 0.5-5cm / s; drying at the drying temperature of 20-30 DEG C and the relative humidity of 30-60% to acquire dried and smooth casting belts; and stacking and pressing the dried casting belts, and then cutting to form composite soft magnetic rings with different sizes, wherein the sheet magnetic powder in the acquired magnetic rings is arranged along the ring surface in parallel, and thus the high magnetic conductivity is acquired. The preparation method provided by the invention has the advantages that the magnetic field does not need to be orientated, the orderly arranged sheet structures can be continuously and efficiently prepared by using the casting method, and the magnetic conductivity of the composite material can be effectively improved.

Description

technical field

[0001] The invention relates to a method for preparing a soft magnetic composite material, belonging to the field of magnetic material preparation. Background technique

[0002] Soft magnetic materials are magnetic materials with low coercive force and high magnetic permeability. They are widely used in the fields of electric power, information, energy, transportation and national defense. They are important functional materials and key basic materials of the national economy. With the miniaturization, light weight, high frequency and integration of electric and electronic equipment, the demand for soft magnetic materials is increasing, and soft magnetic materials are also developing in the direction of high permeability, high frequency and low loss. . Metal soft magnetic materials have high saturation flux density and high permeability, which can meet the needs of miniaturization, but they have low resistivity and high-frequency eddy current loss, so they a...

Examples

Embodiment 1

[0040] 1) Raw material preparation

[0041] The main magnetic phase is flake Fe powder;

[0042] The powder is prepared by ball milling method;

[0043] Powder thickness is 1μm, diameter is 40μm;

[0044] Other components include: insulating media, solvents, dispersants and adhesives;

[0045] The insulating medium is: glass powder;

[0046] The solvent is: water;

[0047] The dispersant is: polyacrylic acid;

[0048] The adhesive is: PVA;

[0049] 2) Preparation of slurry

[0050] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 5 h to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 0.5 h, and vacuum degassed , to obtain a dispersed slurry;

[0051]The insulating medium content is 0.5 wt.% of the soft magnetic alloy;

[0052] The dispersant content is 0.1 wt.% of the solvent;

[0053] The binder content is 0.3 wt.% of the solvent;

[0054] The soli...

Embodiment 2

[0062] 1) Raw material preparation

[0063] The main magnetic phase is flake Fe-Si powder;

[0064] The powder is prepared by ball milling method;

[0065] Powder thickness is 2μm, diameter is 60μm;

[0066] Other components include: insulating media, solvents, dispersants and adhesives;

[0067] The insulating medium is: water glass;

[0068] The solvent is: water;

[0069] The dispersant is: polymethacrylic acid;

[0070] The adhesive is: acrylic emulsion;

[0071] 2) Preparation of slurry

[0072] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 8 hours to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 1 hour, and vacuum degassed. Obtain a dispersed slurry;

[0073] The insulating medium content is 0.8 wt.% of the soft magnetic alloy;

[0074] The dispersant content is 0.5 wt.% of the solvent;

[0075] The binder content is 0.5 wt.% of the solven...

Embodiment 3

[0084] 1) Raw material preparation

[0085] The main magnetic phase is flake Fe-Ni powder;

[0086] The powder is prepared by ball milling method;

[0087] Powder thickness is 4μm, diameter is 100μm;

[0088] Other components include: insulating media, solvents, dispersants and adhesives;

[0089] The insulating medium is: MgO;

[0090] The solvent is: ethanol;

[0091] The dispersant is: herring oil;

[0092] The adhesive is: polyvinyl acetate;

[0093] 2) Preparation of slurry

[0094] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 10 h to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 2 h, and vacuum degassed. Obtain a dispersed slurry;

[0095] The insulating medium content is 1.0 wt.% of the soft magnetic alloy;

[0096] The dispersant content is 1 wt.% of the solvent;

[0097] The binder content is 0.8 wt.% of the solvent;

[0098] The soli...

technical field

[0001] The invention relates to a method for preparing a soft magnetic composite material, belonging to the field of magnetic material preparation. Background technique

[0002] Soft magnetic materials are magnetic materials with low coercive force and high magnetic permeability. They are widely used in the fields of electric power, information, energy, transportation and national defense. They are important functional materials and key basic materials of the national economy. With the miniaturization, light weight, high frequency and integration of electric and electronic equipment, the demand for soft magnetic materials is increasing, and soft magnetic materials are also developing in the direction of high permeability, high frequency and low loss. . Metal soft magnetic materials have high saturation flux density and high permeability, which can meet the needs of miniaturization, but they have low resistivity and high-frequency eddy current loss, so they a...

Examples

Embodiment 1

[0040] 1) Raw material preparation

[0041] The main magnetic phase is flake Fe powder;

[0042] The powder is prepared by ball milling method;

[0043] Powder thickness is 1μm, diameter is 40μm;

[0044] Other components include: insulating media, solvents, dispersants and adhesives;

[0045] The insulating medium is: glass powder;

[0046] The solvent is: water;

[0047] The dispersant is: polyacrylic acid;

[0048] The adhesive is: PVA;

[0049] 2) Preparation of slurry

[0050] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 5 h to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 0.5 h, and vacuum degassed , to obtain a dispersed slurry;

[0051]The insulating medium content is 0.5 wt.% of the soft magnetic alloy;

[0052] The dispersant content is 0.1 wt.% of the solvent;

[0053] The binder content is 0.3 wt.% of the solvent;

[0054] The soli...

Embodiment 2

[0062] 1) Raw material preparation

[0063] The main magnetic phase is flake Fe-Si powder;

[0064] The powder is prepared by ball milling method;

[0065] Powder thickness is 2μm, diameter is 60μm;

[0066] Other components include: insulating media, solvents, dispersants and adhesives;

[0067] The insulating medium is: water glass;

[0068] The solvent is: water;

[0069] The dispersant is: polymethacrylic acid;

[0070] The adhesive is: acrylic emulsion;

[0071] 2) Preparation of slurry

[0072] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 8 hours to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 1 hour, and vacuum degassed. Obtain a dispersed slurry;

[0073] The insulating medium content is 0.8 wt.% of the soft magnetic alloy;

[0074] The dispersant content is 0.5 wt.% of the solvent;

[0075] The binder content is 0.5 wt.% of the solven...

Embodiment 3

[0084] 1) Raw material preparation

[0085] The main magnetic phase is flake Fe-Ni powder;

[0086] The powder is prepared by ball milling method;

[0087] Powder thickness is 4μm, diameter is 100μm;

[0088] Other components include: insulating media, solvents, dispersants and adhesives;

[0089] The insulating medium is: MgO;

[0090] The solvent is: ethanol;

[0091] The dispersant is: herring oil;

[0092] The adhesive is: polyvinyl acetate;

[0093] 2) Preparation of slurry

[0094] The flaky soft magnetic alloy powder was mixed with insulating medium, solvent, dispersant and binder for 10 h to prepare a slurry with low viscosity and high solid phase fraction; then the binder was added, ball milled for 2 h, and vacuum degassed. Obtain a dispersed slurry;

[0095] The insulating medium content is 1.0 wt.% of the soft magnetic alloy;

[0096] The dispersant content is 1 wt.% of the solvent;

[0097] The binder content is 0.8 wt.% of the solvent;

[0098] The soli...