GB1077377A - Improvements in or relating in ferro-magnetic core laminations and process for production thereof - Google Patents

Improvements in or relating in ferro-magnetic core laminations and process for production thereof

Info

Publication number
GB1077377A
GB1077377A GB3007963A GB3007963A GB1077377A GB 1077377 A GB1077377 A GB 1077377A GB 3007963 A GB3007963 A GB 3007963A GB 3007963 A GB3007963 A GB 3007963A GB 1077377 A GB1077377 A GB 1077377A
Authority
GB
United Kingdom
Prior art keywords
laminations
glass
coating
range
ferro
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
GB3007963A
Inventor
Peter William Mcmillan
Graham Partridge
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.)
English Electric Co Ltd
Original Assignee
English Electric Co Ltd
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 English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB3007963A priority Critical patent/GB1077377A/en
Priority to FR982910A priority patent/FR1402402A/en
Priority to CH997164A priority patent/CH433507A/en
Publication of GB1077377A publication Critical patent/GB1077377A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/087—Chemical composition of glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Glass Compositions (AREA)

Abstract

Ferro-magnetic core laminations for electrical apparatus are provided with a coating of glass or glass-ceramic, the coating being fired on and having a coefficient of linear expansion lower than that of the laminations so that, on cooling after firing, the laminations are stressed in tension. The glass composition may be within the following range of percentages by weight: .SiO2.30.0-65.0 .B2O3.0-25.0 .Al2O3.0-15.0 .ZnO.0-14.5 .BaO.0-36.0 .MgO.0-4.0 .CaO.0-10.0 .K2O.0-11.0 .Na2O.3.5-19.5 .Li2O.0-2.4 .CoO.0-0.5 .NiO.0-0.5 the total divalent metal oxides being within the range 5.5-50.5% and the total monovalent metal oxides being within the range 11.0-20.0%. The glass is formed into frit which is powdered and added to water with an anti-setting agent or methylated spirits to form a suspension. Aluminium oxide, zirconium oxide or calcined clay may be added to the suspension which is applied to the laminations by spraying or dipping. Alternatively, dry glass powder may be applied to the laminations electrostatically. The laminations may be of 3% silicon iron and may be fired whilst stacked together, possibly in a reducing or non-oxidizing atmosphere so that the powder coating may be fused and bond the laminations together, the temperature being chosen, if desired, so that annealing of the laminations is also effected. Six examples using varying glass compositions and melting and firing temperatures &c., and giving different tensile stresses in the laminations, are described.
GB3007963A 1963-07-30 1963-07-30 Improvements in or relating in ferro-magnetic core laminations and process for production thereof Expired GB1077377A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB3007963A GB1077377A (en) 1963-07-30 1963-07-30 Improvements in or relating in ferro-magnetic core laminations and process for production thereof
FR982910A FR1402402A (en) 1963-07-30 1964-07-24 Ferro-magnetic core sheets and method of manufacture
CH997164A CH433507A (en) 1963-07-30 1964-07-30 Sheet for ferromagnetic core and method for its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3007963A GB1077377A (en) 1963-07-30 1963-07-30 Improvements in or relating in ferro-magnetic core laminations and process for production thereof

Publications (1)

Publication Number Publication Date
GB1077377A true GB1077377A (en) 1967-07-26

Family

ID=10301928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3007963A Expired GB1077377A (en) 1963-07-30 1963-07-30 Improvements in or relating in ferro-magnetic core laminations and process for production thereof

Country Status (2)

Country Link
CH (1) CH433507A (en)
GB (1) GB1077377A (en)

Cited By (1)

* 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

Cited By (1)

* 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

Also Published As

Publication number Publication date
CH433507A (en) 1967-04-15

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