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An in-situ passivation insulation coating treatment method of a metal soft magnetic composite material

A composite material and insulating coating technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of low bonding strength of insulating film and uneven coating layer, and achieve large-scale industrial production, low preparation cost and strong bonding. Effect

Inactive Publication Date: 2019-01-15
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defects of low bonding strength and uneven coating layer of the current soft magnetic composite material, the invention provides an in-situ passivation insulation coating treatment method for the metal soft magnetic composite material. Cover one deck with the passivation film of high thermal stability and high resistivity, the technical scheme of the present invention is as follows:

Method used

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  • An in-situ passivation insulation coating treatment method of a metal soft magnetic composite material
  • An in-situ passivation insulation coating treatment method of a metal soft magnetic composite material
  • An in-situ passivation insulation coating treatment method of a metal soft magnetic composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 6 g of concentrated sulfuric acid to 30 g of absolute ethanol and stir for 15 min to obtain a passivation solution. After sieving 15 g of iron powder for particle size ratio, add it to the passivation solution, stir evenly for 20 min, then filter and dry to obtain passivated magnetic powder. Add a binder accounting for 1.0% of the mass of the passivated magnetic powder into the passivated magnetic powder, and stir fully under heating conditions until the mixture is dry and uniformly mixed, and the binder is epoxy resin. Finally, in the passivated magnetic powder, add a release agent accounting for 0.5% of the total weight of the passivated magnetic powder and mix evenly. The release agent is zinc stearate to obtain the magnetic powder to be formed. The magnetic powder to be molded was pressed under a pressure of 800 MPa to form an annular soft magnetic composite material with an outer diameter of 23.4 mm, an inner diameter of 14.4 mm, and a height of 8.8 mm. Nitroge...

Embodiment 2

[0030] Add 5 g of concentrated nitric acid into 25 g of absolute ethanol and stir for 20 min to obtain a passivation solution. Sieve 10 g of sendust powder for particle size ratio, add it into the passivation solution, and stir evenly for 10 min, then filter and dry to obtain passivated magnetic powder. Add a binder accounting for 0.5% of the mass of the passivated magnetic powder into the passivated magnetic powder, and stir fully under heating conditions until the mixture is dry and uniformly mixed, and the binder is a phenolic resin. Finally, in the passivated magnetic powder, add a release agent accounting for 1.0% of the total weight of the passivated magnetic powder and mix evenly. The release agent is calcium stearate to obtain the magnetic powder to be formed. The magnetic powder to be molded was pressed under a pressure of 1800 MPa to form an annular soft magnetic composite material with an outer diameter of 23.4 mm, an inner diameter of 14.4 mm, and a height of 8.8 m...

Embodiment 3

[0038] Add 10 g of concentrated nitrous acid into 40 g of absolute ethanol and stir for 10 min to obtain a passivation solution. After sieving 20 g of iron-nickel powder for particle size ratio, add it to the passivation solution, stir evenly for 15 minutes, then filter and dry to obtain passivated magnetic powder. Add a binder accounting for 1.5% of the mass of the passivated magnetic powder into the passivated magnetic powder, and stir fully under heating conditions until the mixture is dry and uniformly mixed, and the binder is silicone resin. Finally, in the passivated magnetic powder, add a release agent accounting for 0.5% of the total weight of the passivated magnetic powder and mix evenly. The release agent is barium stearate to obtain the magnetic powder to be formed. The magnetic powder to be molded is pressed under a pressure of 1400 MPa to form an annular soft magnetic composite material with an outer diameter of 23.4 mm, an inner diameter of 14.4 mm, and a height ...

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Abstract

The invention discloses an in-situ passivation coating treatment method of a metal soft magnetic composite material. In-situ passivation method was used to insulate the metal magnetic powder, and thenthe target product was obtained by bonding, pressing, heat treatment and spraying. A lay of dense passivation film is generated on that surface of the magnetic pow in situ by an in-situ passivation method, the passivation film is uniformly coated, the thickness is controllable, the resistivity is high, the thermal stability and the bonding strength are good, and the passivation film has excellentmagnetic and mechanical properties; In-situ passivation method was used to coat a layer of oxide passivation film on the surface of metal magnetic powder. The coating effect was better than that of the existing method, and it was easy to be operated and mass produced. The effective permeability of soft magnetic composites is greatly improved and the core loss is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic materials, in particular to an in-situ passivation insulation coating treatment method for metal soft magnetic composite materials. Background technique [0002] Metal soft magnetic composite materials are made by mixing and pressing metal magnetic powder and insulating medium. The particle size of the metal magnetic powder is small, and the skin effect is not obvious, so the frequency stability of the magnetic permeability is high. At the same time, the metal soft magnetic composite material also has a high resistivity and can be applied to medium and high frequencies. It can be processed into various complex shapes by powder metallurgy technology. It has the characteristics of low coercive force and low loss, making the soft magnetic composite material as a filter. , inductors, choke coils, etc. are widely used in electronic communications and power switches and other fields. ...

Claims

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Application Information

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IPC IPC(8): H01F1/26
CPCH01F1/26
Inventor 刘冬高善民王峰钟琳琳刘桂静
Owner SHANDONG UNIV OF TECH
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