GB807527A - Improvements in insulated coatings for magnetic sheet material - Google Patents

Improvements in insulated coatings for magnetic sheet material

Info

Publication number
GB807527A
GB807527A GB34315/55A GB3431555A GB807527A GB 807527 A GB807527 A GB 807527A GB 34315/55 A GB34315/55 A GB 34315/55A GB 3431555 A GB3431555 A GB 3431555A GB 807527 A GB807527 A GB 807527A
Authority
GB
United Kingdom
Prior art keywords
suspension
silica
colloidal silica
per cent
weight
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
GB34315/55A
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Publication of GB807527A publication Critical patent/GB807527A/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
    • 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)
  • Inorganic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Paints Or Removers (AREA)

Abstract

A composition for use in preventing magnetic sheet material from sticking during annealing comprises a water suspension of refractory oxides, the suspension containing colloidal silica obtained by an ion-exchange process and having a SiO2 to Na2O ratio of between 75 and 95 to 1 and at least one other refractory oxide, preferably magnesium oxide, whereby after drying the suspension and annealing the sheet a thin, tightly adherent, electrically insulating coating is formed on the sheet. The colloidal silica may have a size to provide for silica micelles containing about 33,000 silica nuclei. The suspension, which may contain instead of magnesia, lime, alumina, zirconia or calcined dolomite, is coated on to a plate, e.g. of silica steel, dried, and the plate annealed, which results in the desired coating. The colloidal silica may be present in amount 1.5-6 per cent by weight of the total suspension and the refractory oxide in 2-7 per cent by weight of the total suspension.ALSO:A composition for use in preventing magnetic sheet material from sticking during annealing comprises a water suspension of refractory oxides, the suspension containing colloidal silica obtained by an ion exchange process and having a SiO2 to Na2O ratio of between 75 and 95 to 1 and at least one other refractory oxide, preferably magnesium oxide, whereby after drying the suspension and annealing the sheet, a thin, tightly adherent electrically insulating coating is formed on the sheet. The colloidal silica may have a size to provide for silica nicelles containing about 33,000 silica nuclei. The suspension which may contain, instead of magnesia, lime, alumina, zironia or calcined dolomite, is coated on to a plate, e.g., of silicon steel, dried and the plate annealed which results in the formation of the desired coating. The colloidal silica may be present in amount 1.5 per cent by weight of the total suspension and the refractory oxide in 2-7 per cent. by weight of the total suspension.
GB34315/55A 1954-12-02 1955-11-30 Improvements in insulated coatings for magnetic sheet material Expired GB807527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US807527XA 1954-12-02 1954-12-02

Publications (1)

Publication Number Publication Date
GB807527A true GB807527A (en) 1959-01-14

Family

ID=22159383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34315/55A Expired GB807527A (en) 1954-12-02 1955-11-30 Improvements in insulated coatings for magnetic sheet material

Country Status (1)

Country Link
GB (1) GB807527A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125809A (en) * 1982-07-16 1984-03-14 Osaka Soda Co Ltd Antifouling coating compositions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125809A (en) * 1982-07-16 1984-03-14 Osaka Soda Co Ltd Antifouling coating compositions

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