Method of manufacturing inorganic insulation
AssigneeSumitomo Electric Industries, Ltd.
InventorsKazuo Sawada, Shinji Inazawa, Kouichi Yamada
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Abstract
A solution of a ceramics precursor prepared from at last one or two types of metal alkoxides or metal acylates is applied onto a ceramics film having irregularity on its surface, which is formed on a conductor surface, to fill up irregular portions of the surface. This ceramics precursor solution is at least partially changed to a ceramics state by heating. The surface is smoothed by such application of the ceramics precursor solution, and general disadvantages of weakness against rubbing and inferiority in workability can be improved. Further, it is possible to improve an outgassing property.
Claims14
A method for manufacturing on an electrical conductor an inorganic insulation with a smooth surface finish measured as a finish surface roughness Ra2, comprising the following steps:
- (a) forming a ceramic coating film on said electrical conductor, mixing silicone resin with ceramic particles and/or ceramic fibers to form a mixture, applying said mixture to said electrical conductor to form a coating film, first heating said coating film at a first temperature sufficiently low so that said silicone resin is not changed into a ceramic state and then second heating said coating film at a second higher temperature to convert said silicone resin into said ceramic coating film with said ceramic particles and/or fibers embedded in said ceramic coating film, whereby said ceramic coating film has a film surface with an initial surface roughness Ra1,
- (b) preparing a solution of a ceramic precursor selected from the group consisting of metal alkoxides and metal acylates,
- (c) applying said ceramic precursor solution to said film surface of said ceramic coating film, and
- (d) heating said ceramic precursor solution sufficiently to convert said ceramic precursor solution at least partially to a ceramic state, whereby said initial surface roughness Ra1 is reduced and a smooth, dense composite insulator layer is formed on said electrical conductor, wherein said finish surface roughness Ra2 is smaller than said initial surface roughness Ra1.
The method of claim 11, comprising making said electrical conductor of an anodizable metal.
Dependencies are inferred from the claim text.