Enhanced dielectric strength mica tapes
AssigneeSiemens Westinghouse Power Corporation
InventorsJames D. B. Smith, Franklin T. Emery
Life of this patent
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Abstract
A flexible insulating tape (16) contains a flexible backing (18) and a mica or mica-like silicate matrix (20) with insulating resin (17) and intercalated metal ions (12) between the matrix (2) where the resin (17) and the ions (12) are intimately disposed next to the mica (20).
Claims14
A flexible electrically insulating mica tape, comprising a flexible backing and a mica matrix structure bonded to the backing, where the mica tape also contains insulating resin and intercalated metal ions selected from the group consisting of Cr, Sn, Zn and mixtures thereof, where resin and metal ions are intimately disposed around and within the mica matrix structure.
A method of making a flexible electrically insulating mica tape suitable for use as an electrical insulation, comprising the steps of:
- (A) providing a mixture of mica, liquid resin and ions selected from the group consisting of Cr, Sn, Zn and mixtures thereof;
- (B) applying the mixture to a backing so that a mica matrix forms on and bonds to the backing where the resin and metal ions are intimately disposed adjacent to the mica;
- (C) wrapping the mica tape around an electrical conductor;
- and
- (D) curing the resin.
Dependencies are inferred from the claim text.