A kind of preparation method of iron silicon nickel magnetic powder core

Abstract

The invention discloses a Fe-Si-Ni magnetic powder core and a preparation method thereof.The method comprises the following steps of: 1) smelting a Fe-Si-Ni alloy cast ingot with a vacuum induction furnace, 2) mechanically crushing the alloy cast ingot and ball-milling into powder for annealing treatment in an argon shield atmosphere, 3) taking Fe-Si-Ni powder for particle size distribution in a certain proportion, 4) adding a passivating agent into the prepared Fe-Si-Ni powder for passivating treatment, 5) adding magnetic particle glue and an insulating agent diluted by acetone, and uniformly stirring for insulating adhesion and coating, 6) then adding a lubrication releasing agent, mixing uniformly, and conducting pressure forming, and 7) placing a compression molding sample in a shielding gas atmosphere for annealing treatment, furnace cooling and spraying, and obtaining a target product.According to the method, a Ni content in the alloy powder is lower, so that the cost is lower; the packing density can be maximized by the reasonable particle size distribution of the alloy powder; the saturation induction density of the magnetic powder core is improved; and power loss of the magnetic powder core is reduced.

Description

technical field

[0001] The invention relates to the technical field of manufacturing magnetic materials, in particular to a method for preparing a FeSiNi magnetic powder core. Background technique

[0002] Metal magnetic powder core is a magnetic element made by mixing and pressing ferromagnetic particles and insulating coating agent. The magnetic powder is separated by a non-magnetic insulating medium, and the particles are insulated. Therefore, the eddy current loss of the magnetic powder core at medium and high frequencies It is very small, its magnetic permeability is small but it has good linearity, and it has high saturation magnetic induction, which can be applied to high frequency occasions. The magnetic properties of the magnetic powder core are related to various factors such as the material of the magnetic powder itself, the particle size of the magnetic powder, the type and amount of the insulating coating agent, the pressing pressure and the heat treatment proce...

Examples

Embodiment 1

[0028]Put the iron-silicon-nickel powder (containing Si 5%, Ni 20%, Al 0.01%, Ca 0.05%, C 0.02%, and the balance is Fe) prepared by dry grinding process in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 700 °C and the annealing time was 1 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 30% of the total; -200 mesh to +300 mesh particles account for 40% of the total; -300 mesh to +400 mesh Purpose particles account for 20% of the total; the rest are -400 mesh particles, accounting for 10% of the total. Add phosphoric acid accounting for 1.8% of the mass of the iron silicon nickel powder to the prepared iron silicon nickel powder for passivation treatment, then add magnetic powder glue acetone solution accounting for 0.5% of the mass of the iron silicon nickel powder, and 0.8% of the mass of the iron silicon nickel po...

Embodiment 2

[0033] The FeSiNi powder (containing 10% Si, 15% Ni, 0.2% Al, 0.01% Ca, 0.05% C, and the balance is Fe) prepared by dry grinding process is placed in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 400 °C and the annealing time was 5 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 10% of the total; -200 mesh to +300 mesh particles account for 35% of the total; -300 mesh to +400 mesh Purpose particles accounted for 35% of the total; the remaining -400 mesh particles accounted for 20% of the total. Divide the prepared ferrosilicon nickel powder into 5 parts on average, numbered 1~5, add chromic acid accounting for 0.2%, 0.6%, 1.0%, 1.4% and 1.8% of the mass of the ferrosilicon nickel powder for passivation treatment, and then add Acetone solution of magnetic powder glue accounting for 1.0% of the mass of sendustrine ...

Embodiment 3

[0038] Put the ferrosilicon nickel powder (containing 20% ​​Si, 8% Ni, 0.05% Al, 0.2% Ca, 0.02% C, and the balance is Fe) prepared by the wet grinding process in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 500 °C and the annealing time was 3 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 20% of the total; -200 mesh to +300 mesh particles account for 50% of the total; -300 mesh to +400 mesh Purpose particles accounted for 15% of the total; the remaining -400 mesh particles accounted for 15% of the total. Add hydrogen peroxide accounting for 0.2% of the mass of iron silicon nickel powder to the prepared iron silicon nickel powder for passivation treatment, then add magnetic powder glue acetone solution accounting for 1.5% of the mass of iron silicon nickel powder, and 0.02% of the mass of iron silicon nickel powd...

technical field

[0001] The invention relates to the technical field of manufacturing magnetic materials, in particular to a method for preparing a FeSiNi magnetic powder core. Background technique

[0002] Metal magnetic powder core is a magnetic element made by mixing and pressing ferromagnetic particles and insulating coating agent. The magnetic powder is separated by a non-magnetic insulating medium, and the particles are insulated. Therefore, the eddy current loss of the magnetic powder core at medium and high frequencies It is very small, its magnetic permeability is small but it has good linearity, and it has high saturation magnetic induction, which can be applied to high frequency occasions. The magnetic properties of the magnetic powder core are related to various factors such as the material of the magnetic powder itself, the particle size of the magnetic powder, the type and amount of the insulating coating agent, the pressing pressure and the heat treatment proce...

Examples

Embodiment 1

[0028]Put the iron-silicon-nickel powder (containing Si 5%, Ni 20%, Al 0.01%, Ca 0.05%, C 0.02%, and the balance is Fe) prepared by dry grinding process in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 700 °C and the annealing time was 1 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 30% of the total; -200 mesh to +300 mesh particles account for 40% of the total; -300 mesh to +400 mesh Purpose particles account for 20% of the total; the rest are -400 mesh particles, accounting for 10% of the total. Add phosphoric acid accounting for 1.8% of the mass of the iron silicon nickel powder to the prepared iron silicon nickel powder for passivation treatment, then add magnetic powder glue acetone solution accounting for 0.5% of the mass of the iron silicon nickel powder, and 0.8% of the mass of the iron silicon nickel po...

Embodiment 2

[0033] The FeSiNi powder (containing 10% Si, 15% Ni, 0.2% Al, 0.01% Ca, 0.05% C, and the balance is Fe) prepared by dry grinding process is placed in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 400 °C and the annealing time was 5 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 10% of the total; -200 mesh to +300 mesh particles account for 35% of the total; -300 mesh to +400 mesh Purpose particles accounted for 35% of the total; the remaining -400 mesh particles accounted for 20% of the total. Divide the prepared ferrosilicon nickel powder into 5 parts on average, numbered 1~5, add chromic acid accounting for 0.2%, 0.6%, 1.0%, 1.4% and 1.8% of the mass of the ferrosilicon nickel powder for passivation treatment, and then add Acetone solution of magnetic powder glue accounting for 1.0% of the mass of sendustrine ...

Embodiment 3

[0038] Put the ferrosilicon nickel powder (containing 20% ​​Si, 8% Ni, 0.05% Al, 0.2% Ca, 0.02% C, and the balance is Fe) prepared by the wet grinding process in a heat treatment furnace with a nitrogen protective atmosphere for annealing The annealing temperature was 500 °C and the annealing time was 3 h. The iron-silicon-nickel powder after annealing is proportioned according to the following particle size: -100 mesh to +200 mesh particles account for 20% of the total; -200 mesh to +300 mesh particles account for 50% of the total; -300 mesh to +400 mesh Purpose particles accounted for 15% of the total; the remaining -400 mesh particles accounted for 15% of the total. Add hydrogen peroxide accounting for 0.2% of the mass of iron silicon nickel powder to the prepared iron silicon nickel powder for passivation treatment, then add magnetic powder glue acetone solution accounting for 1.5% of the mass of iron silicon nickel powder, and 0.02% of the mass of iron silicon nickel powd...

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