GB639844A - Improvements in or relating to electrical insulation - Google Patents

Improvements in or relating to electrical insulation

Info

Publication number
GB639844A
GB639844A GB9011/47A GB901147A GB639844A GB 639844 A GB639844 A GB 639844A GB 9011/47 A GB9011/47 A GB 9011/47A GB 901147 A GB901147 A GB 901147A GB 639844 A GB639844 A GB 639844A
Authority
GB
United Kingdom
Prior art keywords
phosphoric acid
silicon compound
ferrous
mixture
fine silica
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
GB9011/47A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International Co
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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB639844A publication Critical patent/GB639844A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets
    • H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

A ferrous metal, e.g. in the form of wires, bars, strips and sheets is provided with a coating of high electrical resistance by a process which comprises treating the member with a solution comprising phosphoric acid, e.g. orthophosphoric acid and a silicon compound capable of liberating microscopically fine silica when heated and heat treating the coated member at a temperature of from 300 DEG to 950 DEG C. whereby the phosphoric acid reacts with the ferrous metal and fine silica is simultaneously liberated from the silicon compound. Specified silicon compounds are tetraethyl, tetrabutyl, methyl, glyceryl, diglycol, ethylene glycol and hexa-ethyl silicates. Suitable solvents are water or an aliphatic alcohol, e.g. ethanol, propanol, isopropanol, butanol, diethylene glycol and propylene glycol, or a mixture. The alcohol in the mixture may be replaced wholly or in part by diethyl ether or acetone. Chromic acid may replace phosphoric acid in amounts up to 35 per cent of the latter. The solution may be applied by dipping, spraying or flowing. The ferrous member may be a continuous strip which after treatment is wound into a core, annealed, impregnated with a resin and cut to the desired shapes, e.g. transformer cores. The ferrous material may contain silicon, aluminium, nickel or cobalt.ALSO:Ferrous metal is provided with a coating of high electrical resistance by treatment with a solution of phosphoric acid, e.g., orthophosphoric acid, and a silicon compound capable of liberating microscopically fine silica when heated, and heat treating the coated member at a temperature of from 300-950 DEG C whereby the phosphoric acid reacts with the ferrous metal and fine silica is simultaneously liberated from the silicon compound. The silicon compound may be tetraethyl, tetrabutyl, methyl, glyceryl, diglycol, ethylene glycol or hexa-ethyl silicate, or a mixture of these compounds. The solvent may be water or an aliphatic alcohol, e.g., ethanol, propanol, isopropanol, butanol, diethylene glycol, propylene glycol, or mixtures, or the alcohol in the mixture may be replaced wholly or in part by diethyl ether or acetone. Chromic acid may replace phosphoric acid in amounts up to 35 per cent. The solution may be applied by diping, spraying or flowing. The ferrous member may be a continuous strip which after treatment is wound into a core, annealed, impregnated with a resin and cut to desired shapes, e.g., transformer cores, and may contain silicon, aluminium, nickel or cobalt.
GB9011/47A 1946-04-03 1947-04-02 Improvements in or relating to electrical insulation Expired GB639844A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US659415A US2484242A (en) 1946-04-03 1946-04-03 Coating ferrous metal sheets with an insulating film

Publications (1)

Publication Number Publication Date
GB639844A true GB639844A (en) 1950-07-05

Family

ID=24645318

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9011/47A Expired GB639844A (en) 1946-04-03 1947-04-02 Improvements in or relating to electrical insulation

Country Status (5)

Country Link
US (1) US2484242A (en)
CH (1) CH265313A (en)
FR (1) FR946474A (en)
GB (1) GB639844A (en)
NL (1) NL66964C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811473A (en) * 1953-12-07 1957-10-29 United States Steel Corp Composition and method for increasing surface resistivity of silicon steel

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645716A (en) * 1948-08-24 1953-07-14 Westinghouse Air Brake Co Electron tube circuits
NL80923C (en) * 1951-08-29
US2835618A (en) * 1954-03-09 1958-05-20 Parker Rust Proof Co Solution and method for producing heat resistant electrical insulation coatings on ferrous surfaces
US2920296A (en) * 1955-01-07 1960-01-05 Gen Electric Reduction of transformer noise due to magnetostrictive effects
US2935422A (en) * 1955-10-28 1960-05-03 Poor & Co Corrosion preventing coatings and coating compositions
US2879183A (en) * 1955-12-15 1959-03-24 Bell Telephone Labor Inc Insulating coatings and a method for their production
US2978349A (en) * 1957-07-03 1961-04-04 Eastern Prod Corp Soil proofing
US2909454A (en) * 1957-12-04 1959-10-20 United States Steel Corp Process for producing core-plated electrical steel strip
US3104993A (en) * 1960-09-20 1963-09-24 Inland Steel Co Galvanizing process
US3276923A (en) * 1961-04-17 1966-10-04 Gen Electric Reduction in magnetic losses in electrical induction apparatus
US3138492A (en) * 1961-10-11 1964-06-23 Allegheny Ludlum Steel Insulating coating for magnetic steel
US3207636A (en) * 1962-06-26 1965-09-21 Yawata Iron & Steel Co Method for coating silicon steel transformer sheets and composition
FR1427315A (en) * 1964-02-24 1966-02-04 Yawata Iron & Steel Co Process for the formation of electrically insulating coatings on electric sheets
DE1249965B (en) * 1964-08-12
DE2145553C3 (en) * 1971-09-11 1979-07-19 Loi Industrieofenanlagen Gmbh, 4300 Essen Process for the production of laminated cores for the field-leading parts of electrical machines and devices
JPS5652117B2 (en) * 1973-11-17 1981-12-10
EP3937347A1 (en) * 2020-07-08 2022-01-12 Siemens Aktiengesellschaft Material layer for a laminated core of an electric machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750270A (en) * 1927-06-13 1930-03-11 Parker Rust Proof Co Coated iron and steel articles and method of making the same
US1889654A (en) * 1928-01-14 1932-11-29 Ohio Sanitary Engineering Corp Fertilizer
FR679083A (en) * 1928-12-03 1930-04-08 Parker Ste Continentale Surface coating process for iron or steel objects
BE356718A (en) * 1928-12-18 1929-01-31 La Societe Continentale Parker PROCESS FOR SURFACE COATING OF IRON OR STEEL OBJECTS
US2161319A (en) * 1935-04-29 1939-06-06 Ig Farbenindustrie Ag Well-covering coating composition
US2144425A (en) * 1936-12-09 1939-01-17 Sterling Varnish Company Insulating composition
US2413949A (en) * 1942-12-23 1947-01-07 Gen Electric Treating silicon steel strip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811473A (en) * 1953-12-07 1957-10-29 United States Steel Corp Composition and method for increasing surface resistivity of silicon steel

Also Published As

Publication number Publication date
FR946474A (en) 1949-06-03
US2484242A (en) 1949-10-11
CH265313A (en) 1949-11-30
NL66964C (en)

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