Electrical steel sheet and method for manufacturing same
US-12163066-B2 · Dec 10, 2024 · 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
US2022199304A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022199304-A1 |
| Application number | US-202117554272-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 17, 2021 |
| Priority date | Dec 18, 2020 |
| Publication date | Jun 23, 2022 |
| Grant date | — |
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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 0.5pm 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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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 and at least one polymer dispersion as a binding agent, the polymer dispersion being made up of one or more mixed polymerisates from the group consisting 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. 2 . A composition according to claim 1 , wherein the polymer dispersion comprises methacrylic acid ester and optionally acrylic acid ester. 3 . A composition according to claim 1 , wherein the ceramic particles comprise metal oxide hydrates or metal oxides or metal hydroxides. 4 . A composition according to claim 1 , wherein the ceramic particles comprise a chemically surface modified boehmite. 5 . A composition according to claim 1 , wherein the average particle size lies between 10 nm and 300 nm. 6 . A composition according to claim 1 , further comprising at least one rheological additive, wherein the rheological additive comprises an acrylic- and methacrylic-acid-ester-based polymer that contains carboxyl groups and is water soluble in the alkaline range. 7 . A composition according to claim 1 , further comprising at least one rheological additive, wherein the rheological additive contains a hydroxylated cellulose ether. 8 . A coated soft magnetic alloy, wherein in the surface regions provided with the coating, the coating has a maximum application thickness of 1 μm to 15 μm, and a composition according to claim 1 , wherein the soft magnetic alloy has the form of a strip. 9 . A coated soft magnetic alloy according to claim 8 , wherein the soft magnetic alloy is completely covered by the coating. 10 . A coated soft magnetic alloy according to claim 8 , wherein 20% to 80%, of the total surface of the soft magnetic alloy is free of the coating. 11 . A coated soft magnetic alloy according to claim 10 , wherein the coating is arranged on the soft magnetic alloy in the form of a pattern, the pattern taking the form of stripes or dots or a network or a grid. 12 . A coated soft magnetic alloy according to claim 11 , wherein the maximum width of the coated regions is less than 2 mm. 13 . A coated soft magnetic alloy according to claim 8 , wherein the soft magnetic alloy comprises one of 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 %. 14 . A method for producing a coated soft magnetic alloy, the method comprising: providing a soft magnetic alloy, coating the soft magnetic alloy with a water-based alkaline composition according to claim 1 , heat treating the coated soft magnetic alloy, the coating forming an insulating layer of ceramic particles that functions as an annealing separator. 15 . A method according to claim 14 , wherein the soft magnetic alloy is coated by applying a structure, the structure being formed by a pattern of stripes or dots or a network or a grid, between 20% and 80%, of the total surface of the soft magnetic remaining free of the coating. 16 . A method according to claim 15 , wherein the coating is applied to the soft magnetic alloy using profile rollers. 17 . A method according to claim 14 , 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 means of cutting, punching or laser cutting. 18 . A method according to claim 17 , wherein the laminations are stacked to form a stack and the stack is heat treated. 19 . A method according to claim 17 , wherein the laminations are joined together to form a laminated core, the laminations being joined together to form a laminated core by means of welding, laser welding or in-die stacking, and the laminated core is heat treated. 20 . A method according to claim 14 , wherein the soft magnetic alloy is heat treated at a temperature of above 650° C. 21 . A method according to claim 14 , 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 % ≤ Mg ≤ 0.05 wt % 0 wt % ≤ C ≤ 0.02 wt % 0 wt %
Assignees
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Classifications
containing aluminium · CPC title
Application of a separating or insulating coating · CPC title
Treatments in a special environment · CPC title
Stabilisers against degradation by oxygen, light or heat · CPC title
Additives being defined by their particle size in general · CPC title
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- What does patent US2022199304A1 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 0.5pm 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, methacr…
- 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 Thu Jun 23 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).