Full-inorganic high-temperature-resistant insulating bonding method for iron-based metal soft magnetic composite material

A soft magnetic composite material, inorganic high-temperature-resistant technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of low bonding strength and uneven coating of the insulating coating layer, and achieve excellent magnetic properties Performance and mechanical properties, the effect of improving mechanical properties and facilitating mass production

Active Publication Date: 2020-04-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an all-inorganic high-temperature-resistant insulation bonding method for iron-based metal

Method used

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  • Full-inorganic high-temperature-resistant insulating bonding method for iron-based metal soft magnetic composite material
  • Full-inorganic high-temperature-resistant insulating bonding method for iron-based metal soft magnetic composite material
  • Full-inorganic high-temperature-resistant insulating bonding method for iron-based metal soft magnetic composite material

Examples

Experimental program
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Example Embodiment

[0021] Example 1:

[0022] An iron-based metal soft magnetic composite material all-inorganic high temperature resistant insulation bonding method, comprising the following steps:

[0023] (1) The particle size ratio of the iron-silicon-aluminum magnetic powder is carried out according to the weight ratio of 150-200 mesh: 200-300 mesh: 300-400 mesh: 400 mesh or more, 1:3:3:2.5;

[0024] (2) Coating treatment: Mix the acidic (pH: 3-5) silica sol with the acidic (pH: 3-5) aluminum sol according to the volume ratio of 4:1, and add 0.1% dichromic acid by mass of the magnetic powder. potassium, adding iron-silicon-aluminum magnetic powder into the mixed solution, stirring uniformly at 70°C and drying to obtain insulating powder;

[0025] (3) Bonding treatment: Add 1.0% by weight of magnetic powder as a water glass binder, 0.15% by weight of magnetic powder as a curing agent silicon tripolyphosphate, and 1% by weight of magnetic powder as a silicon micropowder with a particle size ...

Example Embodiment

[0029] Example 2:

[0030] An iron-based metal soft magnetic composite material all-inorganic high temperature resistant insulation bonding method, comprising the following steps:

[0031] (1) The particle size ratio of the iron-silicon magnetic powder is 1:3:3:3 according to the weight ratio of 150-200 mesh: 200-300 mesh: 300-400 mesh: 400 mesh or more;

[0032] (2) Coating treatment: Mix alkaline (pH: 8-10) silica sol and alkaline (pH: 7-9) aluminum sol according to the volume ratio of 1:1, and add 0.3% of the magnetic powder by weight. Potassium chromate, add magnetic powder into the mixed solution, stir evenly at 120°C and dry to obtain insulating powder;

[0033] (3) Add 1.0% by weight of magnetic powder as water glass binder, 0.1% by weight of magnetic powder as curing agent silicon tripolyphosphate and 0.8% by weight of magnetic powder and alumina filler with a particle size of 3 microns to the above-mentioned dry insulating powder, at 100 Stir evenly at ℃ and dry, ad...

Example Embodiment

[0037] Example 3:

[0038] An iron-based metal soft magnetic composite material all-inorganic high temperature resistant insulation bonding method, comprising the following steps:

[0039] (1) The particle size ratio of the iron-nickel magnetic powder is carried out according to the weight ratio of 150-200 mesh: 200-300 mesh: 300-400 mesh: 400 mesh or more, 1.5:3:3:2.5;

[0040] (2) Coating treatment: Mix alkaline (pH: 8-10) silica sol and alkaline (pH: 7-9) aluminum sol according to the volume ratio of 3:1, and add 0.1% of the weight of the magnetic powder. Potassium chromate, add the magnetic powder into the mixed solution, stir evenly at 100°C and dry to obtain insulating powder;

[0041] (3) Bonding treatment: Add 0.5% by weight of magnetic powder as water glass binder, 0.05% by weight of magnetic powder as curing agent silicon tripolyphosphate, and 0.5% by weight of magnetic powder and silicon micropowder with a particle size of 2.6 microns to the above-mentioned dry ins...

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Abstract

The invention provides a full-inorganic high-temperature-resistant insulating bonding method for an iron-based metal soft magnetic composite material, and relates to the technical field of iron-basedmetal soft magnetic composite materials. The method comprises the following steps: 1) sieving iron-based magnetic powder to carry out size grading; (2) compounding silica sol and alumina sol, carryingout insulation coating on the prepared magnetic powder and drying; and 3) mixing the dried magnetic powder with a binder and a filler and then drying; and adding demolding powder, carrying out dry pressing molding, and carrying out thermal treatment under the protection of nitrogen to obtain the magnetic powder core. The mixed sol is used for coating the magnetic powder, the coating layer is uniform, the thickness is controllable, the thermal stability is high, the resistivity is high, the loss is low, and the magnetic property and the mechanical property are excellent; and the mixed sol is adopted to insulate and coat the magnetic powder so that the operability is high and batch production is facilitated.

Description

technical field [0001] The invention relates to the technical field of iron-based metal soft magnetic composite materials, in particular to an all-inorganic high-temperature-resistant insulation bonding method for iron-based metal soft magnetic composite materials. Background technique [0002] Metal soft magnetic composite material is a new type of soft magnetic functional material obtained by using iron-based alloy powder as raw material, coating the surface of the particles with insulating medium, pressing and forming, and annealing after heat treatment. Among them, insulation coating is the key link, which plays a decisive role in improving the overall resistivity, reducing eddy current loss, and improving the comprehensive electro-magnetic properties. The insulation coating of magnetic powder has the following requirements: (1) The coating material has high resistivity, which can effectively reduce the eddy current loss; (2) The coating material has high thermal stabili...

Claims

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Application Information

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IPC IPC(8): H01F41/02
CPCH01F41/02
Inventor 郑翠红檀杰林娜方道来冒爱琴俞海云刘国忠
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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