| 摘要 |
Electrical insulation which has good dielectric strength, good radiation resistance, and good thermal resistance at temperatures of up to 500 DEG C. and, preferably up to 1700 DEG C., includes a substrate which is flexible, has the form of a filament, sheet, wrapper, tape or sleeve, and consists essentially of inorganic materials selected from the group consisting of inorganic fibers and metals, metalloids, or alloys; and at least one layer of at least one oxide of an alkoxide-forming element provided on the substrate to impregnate and/or coat same. The insulation is prepared by a process including applying a solution containing an alkoxy gel polymer, optionally additionally containing at least one inorganic material in finely divided form, to the substrate to provide a treated substrate useful as a preform when allowed to set under ambient conditions. The preform is applied to a part by, for example, wrapping, and is heated to pyrolyze the alkoxy gel polymer to its oxide and provide electrical insulation consisting essentially of inorganic materials. The application and pyrolysis steps may be repeated to build up the thickness of the at least one oxide.
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