GB592987A - Improvements in or relating to the surface treatment of laminations of ferrous magnetic material - Google Patents

Improvements in or relating to the surface treatment of laminations of ferrous magnetic material

Info

Publication number
GB592987A
GB592987A GB8290/45A GB829045A GB592987A GB 592987 A GB592987 A GB 592987A GB 8290/45 A GB8290/45 A GB 8290/45A GB 829045 A GB829045 A GB 829045A GB 592987 A GB592987 A GB 592987A
Authority
GB
United Kingdom
Prior art keywords
phosphoric acid
per cent
magnesia
treatment
heat
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
GB8290/45A
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 GB592987A publication Critical patent/GB592987A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • H01F1/16—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 in the form of sheets
    • H01F1/18—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 in the form of sheets with insulating coating

Landscapes

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

Abstract

In the treatment of ferrous magnetic sheet in order to produce thereon a surface film which is insulating and at the same time heat resistant to subsequent strain annealing, the sheet is treated with an aqueous solution containing from 5-60 per cent phosphoric acid and from 2-5 per cent magnesia dissolved therein, and heat-treated to a temperature of 700-900 DEG C. to cause a reaction of the phosphoric acid with the ferrous metal to give an insulating film of phosphate embodying refractory particles of p the precipitated magnesia. The amount of magnesia employed is greatest for high temperature of subsequent strain annealing, and a typically suitable solution contains 30 per cent phosphoric acid and 5 per cent MgO. The heat treatment of the surface film takes place in a neutral or slightly reducing atmosphere of, e.g. 10-20 per cent hydrogen and the balance nitrogen. The Specification as open to inspection under Sect. 91 also describes the application of phosphoric acid and at least one finely divided refractory material of the group magnesia, silica, mica, talc and alumina, the refractory material being applied as a suspension in an aqueous phosphoric acid solution, or being applied after treatment of the surface with the phosphoric acid solution, separating, and either with or without a subsequent heat-treatment. This subject-matter does not appear in the Specification as accepted.
GB8290/45A 1944-04-08 1945-04-04 Improvements in or relating to the surface treatment of laminations of ferrous magnetic material Expired GB592987A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US592987XA 1944-04-08 1944-04-08

Publications (1)

Publication Number Publication Date
GB592987A true GB592987A (en) 1947-10-06

Family

ID=22022086

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8290/45A Expired GB592987A (en) 1944-04-08 1945-04-04 Improvements in or relating to the surface treatment of laminations of ferrous magnetic material

Country Status (1)

Country Link
GB (1) GB592987A (en)

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