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Insulative adhesive for preparing metallic and soft magnetic composite material and using method thereof

A composite material and metal soft magnetic technology, which is applied in adhesives, adhesive additives, and the magnetism of inorganic materials, can solve problems such as not being able to promote magnetic powder compression molding well, affecting the thermal stability of magnetic powder cores, and high thermal stability. Improve the coating effect, improve thermal stability and insulation effect, improve the effect of mechanical strength

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

Although the use of this all-inorganic binder has a certain insulating bonding effect, it affects the magnetic properties because it cannot promote the compression molding of the magnetic powder very well.
There are also some patents that use water glass as a binder. Patent CN 100999021A uses water glass to coat Fe-Ni50 magnetic powder. The heat treatment temperature reaches 700 ° C. However, sodium silicate will decompose at high temperature, which will affect the thermal stability of the magnetic powder core.
[0005] At present, there is no effective binder that can have a good bonding effect like organic resins and have relatively high thermal stability.

Method used

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  • Insulative adhesive for preparing metallic and soft magnetic composite material and using method thereof
  • Insulative adhesive for preparing metallic and soft magnetic composite material and using method thereof
  • Insulative adhesive for preparing metallic and soft magnetic composite material and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Take an appropriate amount of pure iron powder and mix iron powders of different meshes. The iron powder powder with a particle size of -100 mesh to +200 mesh accounts for 10% of the total mass, and the iron powder powder of -200 mesh to +400 mesh It accounts for 60% of the total mass, and iron powder with a mesh size of 400 or more accounts for 30% of the total mass.

[0025] 2) Passivate the configured iron powder with phosphoric acid, stir and dry in a water bath at 60°C to obtain passivated iron powder. The mass of phosphoric acid accounts for 0.6% of the total mass of iron powder.

[0026] 3) First mix the prepared insulating adhesive with xylene, mix evenly, then heat and stir with passivated iron powder, mix evenly and then dry. The quality of the insulating bonding particles is 3% of the total mass of the magnetic powder, and the mass percentage of the composite insulating bonding particles is 40% silicone resin, 60% Al 2 o 3 Inorganic Nanodispersion.

[...

Embodiment 2

[0032] (1) Take an appropriate amount of sendust magnetic powder, mix sendust magnetic powder with different meshes, the particle size of the sendust magnetic powder can reach -100 mesh~+200 mesh, account for 30% of the total mass, and -200 mesh~+ 400 mesh sendust magnetic powder accounts for 40% of the total mass, and sendust magnetic powder above 400 mesh accounts for 30% of the total mass.

[0033] (2) Passivate the configured sendust magnetic powder with phosphoric acid, and the mass of phosphoric acid accounts for 0.6% of the total mass of sendust magnetic powder.

[0034](3) Mix the prepared insulating binder with xylene first, mix evenly, then heat and stir with passivated sendust magnetic powder, mix evenly and then dry. The quality of the insulating bonding particles is 1% of the total mass of the magnetic powder, and the mass percentage of the composite insulating bonding particles is 65% silicone resin, 35% SiO 2 Inorganic nanopowder.

[0035] (4) Add a release ag...

Embodiment 3

[0040] (1) Take an appropriate amount of iron-nickel-molybdenum magnetic powder (containing iron 17.0%, Mo2.0%, Cu1.0%, Al+Si<1.0%, the rest is Ni), and mix iron-nickel-molybdenum magnetic powder with different meshes The iron-nickel-molybdenum magnetic powder with a particle size of -100 mesh to +200 mesh accounts for 20% of the total mass, and the iron-nickel-molybdenum magnetic powder powder with a particle size of -200 mesh to +400 mesh accounts for 60% of the total mass. 25% of the total mass.

[0041] (2) Passivate the configured iron-nickel-molybdenum magnetic powder with chromic acid, and the mass of chromic acid accounts for 0.4% of the total mass of the iron-nickel-molybdenum magnetic powder.

[0042] (3) First mix the prepared insulating binder with xylene, mix evenly, then heat and stir with passivated iron-nickel-molybdenum magnetic powder, mix evenly and then dry. The quality of the insulating bonding particles is 2.5% of the total mass of the magnetic powder, a...

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Abstract

The invention discloses an insulative adhesive for preparing a metallic and soft magnetic composite material and a using method thereof. The insulative adhesive disclosed by the invention is a nano-modified organic silicon resin insulative adhesive which comprises organic silicon resin and an inorganic nano dispersion liquid. The insulative adhesive greatly improve the heat-resisting temperature of the organic silicon resin and improve the mechanical strength of a magnetic powder core, is reasonable in component selection and good in using effect and has a good insulative adhering effect to Fe-based, nickel-based and metallic soft magnetic powder of other metals. The magnetic powder core prepared by the insulative adhesive prepared by the invention has excellent magnetic performance and mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to an insulating binder for preparing metal soft magnetic powder cores and a method for using the same. Background technique [0002] Metal soft magnetic composite material (also known as magnetic powder core) is a kind of soft magnetic material made of metal soft magnetic powder by powder metallurgy process. The rapid development of information technology and electromechanical industry requires high frequency, miniaturization, intelligence and low loss of magnetic devices. Compared with the commonly used silicon steel sheet and soft ferrite, the metal soft magnetic powder core has great advantages in these aspects. Magnetic powder core has many advantages, such as high magnetic flux density, high magnetic permeability and low cost, so it is widely used, but in practical applications, the resistivity of metal magnetic powder core is too low, result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/04H01F1/22
Inventor 严密黄茂勤吴琛
Owner ZHEJIANG UNIV
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