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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 soft magnetic composite materials, which overcomes the defects of low bonding strength and uneven coating of the insulating coating layer of soft magnetic composite materials

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

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Embodiment 1

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

[0023] (1) The sendust magnetic powder is mixed 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 acidic (pH 3-5) silica sol and acidic (pH 3-5) aluminum sol at a volume ratio of 4:1, and add 0.1% dichromic acid of magnetic powder mass Potassium, add sendust magnetic powder into the mixed solution, stir evenly at 70°C and dry to obtain insulating powder;

[0025] (3) Bonding treatment: adding 1.0% water glass binder of magnetic powder weight and 0.15% solidifying agent silicon tripolyphosphate of magnetic powder weight and 1% magnetic powder weight to the above-mentioned dry insulating powder is silicon micropowder of 5 microns Filler, stir evenly at 120°C and dry, add lubricating powder to the dried magnetic powder and sti...

Embodiment 2

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

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

[0032] (2) Coating treatment: mix alkaline (pH 8-10) silica sol and alkaline (pH 7-9) aluminum sol at a volume ratio of 1:1, and add 0.3% of the mass of magnetic powder Potassium chromate, adding magnetic powder into the mixed solution, stirring evenly at 120°C and drying to obtain insulating powder;

[0033] (3) adding the water glass binder of magnetic powder weight 1.0% and the curing agent silicon tripolyphosphate of magnetic powder weight 0.1% to the insulating powder of above-mentioned drying and the particle diameter of magnetic powder weight 0.8% is the alumina filler of 3 microns, at 100 Stir evenly at ℃ and dry, add lubricating ...

Embodiment 3

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

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

[0040] (2) Coating treatment: mix alkaline (pH 8-10) silica sol and alkaline (pH 7-9) aluminum sol at a volume ratio of 3:1, and add 0.1% of the mass of magnetic powder Potassium chromate, adding magnetic powder into the mixed solution, stirring evenly at 100°C and drying to obtain insulating powder;

[0041] (3) Bonding treatment: adding 0.5% of the water glass binder of the magnetic powder weight and 0.05% of the magnetic powder weight of the solidifying agent silicon tripolyphosphate and 0.5% of the magnetic powder weight to the above-mentioned dry insulating powder is silicon micropowder of 2.6 microns filler. Stir evenly and dry at 120°C, add lubr...

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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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