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 sheet

Info

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
Application number
GB139944A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEORGE RAYMOND SHEPHERD
Original Assignee
GEORGE RAYMOND SHEPHERD
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GEORGE RAYMOND SHEPHERD filed Critical GEORGE RAYMOND SHEPHERD
Priority to GB139944A priority Critical patent/GB572491A/en
Publication of GB572491A publication Critical patent/GB572491A/en
Expired legal-status Critical Current

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)
  • Chemical Treatment Of Metals (AREA)
  • Soft Magnetic Materials (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.
GB139944A 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 Expired GB572491A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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