GB587374A - Improvements in or relating to magnetic members and material and to coating compositions for use therewith - Google Patents

Improvements in or relating to magnetic members and material and to coating compositions for use therewith

Info

Publication number
GB587374A
GB587374A GB22101/44A GB2210144A GB587374A GB 587374 A GB587374 A GB 587374A GB 22101/44 A GB22101/44 A GB 22101/44A GB 2210144 A GB2210144 A GB 2210144A GB 587374 A GB587374 A GB 587374A
Authority
GB
United Kingdom
Prior art keywords
magnesia
silicate
calcium
per cent
members
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
GB22101/44A
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 GB587374A publication Critical patent/GB587374A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)

Abstract

A composition for application to ferrous members which are to be heat treated in contact with each other for the manufacture of magnetic cores, the composition serving to prevent the members welding together and to react during heating to form a tenacious insulating coating, comprises a minor proportion, e.g., 2-20 per cent., of barium, beryllium, zirconium, calcium, or magnesium meta-silicate and a major proportion of magnesia. The ferrous material is preferably a silicon-iron material which is heated to 1,000-1,250 DEG C. to develop magnetic characteristics. Ordinary magnesia may be used as a basis, but if it be particularly pure 2-5 per cent. of an alkaline earth oxidizing-agent such as calcium or barium oxide may be added. The magnesia and the silicate are finely powdered and are stirred into water, acetone, or ethyl alcohol, the mixture being then applied by roll coating or spraying. The sheet material is dried at 200-300 DEG C. and is then placed in an annealing furnace at 700-1,250 DEG C. in an atmosphere of hydrogen.
GB22101/44A 1943-11-10 1944-11-09 Improvements in or relating to magnetic members and material and to coating compositions for use therewith Expired GB587374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US587374XA 1943-11-10 1943-11-10

Publications (1)

Publication Number Publication Date
GB587374A true GB587374A (en) 1947-04-23

Family

ID=22018623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22101/44A Expired GB587374A (en) 1943-11-10 1944-11-09 Improvements in or relating to magnetic members and material and to coating compositions for use therewith

Country Status (1)

Country Link
GB (1) GB587374A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985855A (en) * 1957-01-11 1961-05-23 Allis Chalmers Mfg Co Coating for sheet steel in transformer cores
FR2296701A1 (en) * 1973-06-26 1976-07-30 Merck & Co Inc COATINGS FOR SILICON STEEL
US4025379A (en) 1973-05-03 1977-05-24 Whetstone Clayton N Method of making laminated magnetic material
EP0020844A1 (en) * 1978-06-09 1981-01-07 CENTRO SVILUPPO MATERIALI S.p.A. Improvement in the manufacture of oriented grain electrical steel sheet
EP0290196A2 (en) * 1987-05-04 1988-11-09 Marine Magnesium Company Method for improving magnesium oxide steel coatings using non-aqueous solvents

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985855A (en) * 1957-01-11 1961-05-23 Allis Chalmers Mfg Co Coating for sheet steel in transformer cores
US4025379A (en) 1973-05-03 1977-05-24 Whetstone Clayton N Method of making laminated magnetic material
FR2296701A1 (en) * 1973-06-26 1976-07-30 Merck & Co Inc COATINGS FOR SILICON STEEL
EP0020844A1 (en) * 1978-06-09 1981-01-07 CENTRO SVILUPPO MATERIALI S.p.A. Improvement in the manufacture of oriented grain electrical steel sheet
EP0290196A2 (en) * 1987-05-04 1988-11-09 Marine Magnesium Company Method for improving magnesium oxide steel coatings using non-aqueous solvents
EP0290196A3 (en) * 1987-05-04 1989-02-22 Marine Magnesium Company Method for improving magnesium oxide steel coatings using non-aqueous solvents
AU613620B2 (en) * 1987-05-04 1991-08-08 Cph Sub, Inc. Method for improving magnesium oxide steel coatings using non-aqueous solvents

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