Annealing separator composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet
US-2022074011-A1 · Mar 10, 2022 · US
Water-based alkaline composition for forming an insulating layer of an annealing separator, coated soft magnetic alloy and method for producing a coated soft magnetic strip
US12494309B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12494309-B2 |
| Application number | US-202117554272-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 17, 2021 |
| Priority date | Dec 18, 2020 |
| Publication date | Dec 9, 2025 |
| Grant date | Dec 9, 2025 |
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Abstract
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There is provided a water-based alkaline composition for forming an insulating layer of an annealing separator on a soft magnetic alloy, this composition comprising ceramic particles with a particle size of less than 0.5 μm and at least one polymer dispersion as a binding agent, the polymer dispersion comprising one or more mixed polymerisates from the group made up of acrylate polymers, methacrylate polymers, polyvinyl acetate, polystyrene, polyurethane, polyvinyl alcohol, hydroxylated cellulose ether, polyvinyl pyrrolidone, and polyvinyl butyral, and having a pH value of between 8 and 12, preferably between 9 and 11.
First claim
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The invention claimed is: 1 . A water-based alkaline composition for forming an insulating layer of an annealing separator on a soft magnetic alloy, comprising: ceramic particles with an average particle size of less than 0.5 μm, the ceramic particles including a chemically surface modified boehmite, and at least one polymer dispersion as a binding agent, the at least one polymer dispersion including one or more polymerisate selected from the group consisting of acrylate polymers, methacrylate polymers, and hydroxylated cellulose ether, water, and a pH corrector in an amount which allows the composition to have a pH value of between 8 and 12. 2 . A composition according to claim 1 , wherein the at least one polymer dispersion comprises at least one of the methacrylate polymers including methacrylic acid ester and optionally at least one of the acrylate polymers including acrylic acid ester. 3 . A composition according to claim 1 , wherein the average particle size lies between 10 nm and 300 nm. 4 . A composition according to claim 1 , further comprising at least one rheological additive, wherein the at least one rheological additive contains a hydroxylated cellulose ether. 5 . A composition according to claim 1 , wherein the composition further includes at least one rheological additive. 6 . A composition according to claim 1 further comprising a water-soluble alkanolamine. 7 . A composition according to claim 1 , wherein the pH corrector is aqueous ammonia. 8 . A composition according to claim 1 , wherein the pH value of the composition is between 9 and 11. 9 . A composition according to claim 4 , wherein the at least one rheological additive is in an amount which allows the composition to have a viscosity of greater than 100 Pa*s. 10 . A composition according to claim 5 , wherein the at least one polymer dispersion includes an acrylate polymer and a methacrylate polymer; and said at least one rheological additive includes a hydroxylated cellulose ether. 11 . A composition according to claim 10 , wherein the hydroxylated cellulose ether is an amount which allows the composition to have a viscosity of greater than 100 Pa*s. 12 . A composition according to claim 6 , wherein the water-soluble alkanolamine is 2-amino-2-ethyl-1,3-propanediol or 2-amino-2-methyl-1,3-propanediol. 13 . A coated soft magnetic alloy, wherein the soft magnetic alloy includes surface regions, the surface regions are provided with a coating, the coating has a maximum thickness of 1 μm to 15 μm, and a composition according to claim 1 , and wherein the soft magnetic alloy has the form of a strip. 14 . A coated soft magnetic alloy according to claim 13 , wherein the soft magnetic alloy is completely covered by the coating. 15 . A coated soft magnetic alloy according to claim 13 , wherein 20% to 80%, of a total surface of the soft magnetic alloy is free of the coating. 16 . A coated soft magnetic alloy according to claim 13 , wherein the soft magnetic alloy comprises an alloy selected from the group consisting of iron alloys with at least 99.5 wt % Fe and smelting-induced impurities, FeSi alloys with up to 5 wt % Si, NiFe alloys with 30 to 82 wt % Ni, and FeCo alloys with a Co content of between 4 wt % and 50 wt %. 17 . A coated soft magnetic alloy according to claim 15 , wherein the coating is arranged on the soft magnetic alloy in the form of a pattern, the pattern including stripes, dots, a network, or a grid. 18 . A coated soft magnetic alloy according to claim 17 , wherein a maximum width of the coated surface regions is less than 2 mm. 19 . A method for producing a coated soft magnetic alloy, the method comprising: providing a soft magnetic alloy, coating the soft magnetic alloy with the water-based alkaline composition according to claim 1 , and heat treating the coated soft magnetic alloy, the coating forming an insulating layer. 20 . A method according to claim 19 , wherein the soft magnetic alloy is coated by applying a structure, the structure being formed by a pattern of stripes, dots, a network, or a grid, and between 20% and 80% of the total surface of the soft magnetic remaining free of the coating. 21 . A method according to claim 19 , wherein the alloy has the form of a strip and the method further comprises forming a plurality of individually coated laminations made from the coated strip by cutting, punching or laser cutting. 22 . A method according to claim 19 , wherein the soft magnetic alloy is heat treated at a temperature of above 650° C. 23 . A method according to claim 19 , wherein the soft magnetic alloy has a composition consisting essentially of: 5 wt % ≤ Co ≤ 25 wt % 0.3 wt % ≤ V ≤ 5.0 wt % 0 wt % ≤ Cr ≤ 3.0 wt % 0 wt % ≤ Si ≤ 3.0 wt % 0 wt % ≤ Mn ≤ 3.0 wt % 0 wt % ≤ Al ≤ 3.0 wt % 0 wt % ≤ Ta ≤ 0.5 wt % 0 wt % ≤ Ni ≤ 0.5 wt % 0 wt % ≤ Mo ≤ 0.5 wt % 0 wt % ≤ Cu ≤ 0.2 wt % 0 wt % ≤ Nb ≤ 0.25 wt % 0 wt % ≤ Ti ≤ 0.05 wt % 0 wt % ≤ Ce ≤ 0.05 wt % 0 wt % ≤ Ca ≤ 0.05 wt % 0 wt % ≤
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- What does patent US12494309B2 cover?
- There is provided a water-based alkaline composition for forming an insulating layer of an annealing separator on a soft magnetic alloy, this composition comprising ceramic particles with a particle size of less than 0.5 μm and at least one polymer dispersion as a binding agent, the polymer dispersion comprising one or more mixed polymerisates from the group made up of acrylate polymers, methac…
- Who is the assignee on this patent?
- Vacuumschmelze Gmbh & Co Kg
- What technology area does this patent fall under?
- Primary CPC classification H01F1/18. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 09 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).