GB572491A - Improved method of treating sheets of ferrous silicon magnetic material to produce an electrically insulating film on the surfaces of the sheet - Google Patents
Improved method of treating sheets of ferrous silicon magnetic material to produce an electrically insulating film on the surfaces of the sheetInfo
- Publication number
- GB572491A GB572491A GB139944A GB139944A GB572491A GB 572491 A GB572491 A GB 572491A GB 139944 A GB139944 A GB 139944A GB 139944 A GB139944 A GB 139944A GB 572491 A GB572491 A GB 572491A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- metal
- composition
- sheet
- glaze
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
572,491. Vitreous enamel insulation. SHEPHERD, G. R. (Westinghouse Electric International Co.). Jan. 25, 1944, No. 1399. [Class 56] [Also in Group XXXV] A method of treating ferrous silicon magnetic material to produce an electrical insulating surface film comprises applying a refractory coating composition to the surface of the unoxidized sheet, the composition of the coating comprising magnesium oxide, silica and an oxidizing agent, and heat treating at a temperature of 1150‹ C. to 1300‹ C: The oxidizing agent produces an oxide film on the metal which reacts with the coating composition to form a tenaciously adherent insulating glaze. As shown, the metal sheet passes between rolls 12 where the coating in the form of a suspension in water is applied to the upper and lower surfaces, between rolls 22 which adjust the thickness of the coating, through a drier 24, to a furnace 26 where the metal is annealed and glaze formation takes place. Brushes 28 remove any excess coating material. The glaze 62, Fig. 2, is formed only closely adjacent to the surface of the metal 60 ; the remainder of the coating 64 acting as a refractory separator. The coating has the composition 2-10 per cent silica, 2-10 per cent of the carbonate or hydroxide of an alkaline earth metal and the remainder magnesia. The insulated material is then slit at the cutters 30, wound to form a transformer core 34 on a mandrel 32, strain annealed in a furnace 38 and impregnated with a thermoplastic material of the polyvinyl acetate type as described in Specification 553,864, [Group XXXV]. The impregnated core may then be cut into sections by a saw 44 and any burrs removed by a grinding-wheel 48 followed finally by an acid etch.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB139944A GB572491A (en) | 1944-01-25 | 1944-01-25 | Improved method of treating sheets of ferrous silicon magnetic material to produce an electrically insulating film on the surfaces of the sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB139944A GB572491A (en) | 1944-01-25 | 1944-01-25 | Improved method of treating sheets of ferrous silicon magnetic material to produce an electrically insulating film on the surfaces of the sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
GB572491A true GB572491A (en) | 1945-10-10 |
Family
ID=9721313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB139944A Expired GB572491A (en) | 1944-01-25 | 1944-01-25 | Improved method of treating sheets of ferrous silicon magnetic material to produce an electrically insulating film on the surfaces of the sheet |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB572491A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4025379A (en) | 1973-05-03 | 1977-05-24 | Whetstone Clayton N | Method of making laminated magnetic material |
DE3012320A1 (en) * | 1980-03-29 | 1981-10-08 | Forschungsinstitut Prof. Dr.-Ing.habil., Dr.phil.nat. Karl Otto Lehmann, Nachf. GmbH & Cie, 7570 Baden-Baden | Laminated cores for inductive components - where laminations are sepd. from each other by silica grains to form gaps filled with casting resin |
DE19816200A1 (en) * | 1998-04-09 | 1999-10-14 | G K Steel Trading Gmbh | Process for producing a forsterite insulation film on a surface of grain-oriented, anisotropic, electrotechnical steel sheets |
-
1944
- 1944-01-25 GB GB139944A patent/GB572491A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4025379A (en) | 1973-05-03 | 1977-05-24 | Whetstone Clayton N | Method of making laminated magnetic material |
DE3012320A1 (en) * | 1980-03-29 | 1981-10-08 | Forschungsinstitut Prof. Dr.-Ing.habil., Dr.phil.nat. Karl Otto Lehmann, Nachf. GmbH & Cie, 7570 Baden-Baden | Laminated cores for inductive components - where laminations are sepd. from each other by silica grains to form gaps filled with casting resin |
DE19816200A1 (en) * | 1998-04-09 | 1999-10-14 | G K Steel Trading Gmbh | Process for producing a forsterite insulation film on a surface of grain-oriented, anisotropic, electrotechnical steel sheets |
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