Centrifugal casting of graphite for rigid insulation
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United States of America Patent
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Issued Date -
Jan 1, 2004
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2002
priority date (Note) -
Abandoned
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Abstract
Cylindrical castings (174), suited to thermal insulation applications at high temperatures, are formed by a centrifugal casting process. A mixture of carbon-containing fibers, such as isotropic pitch fibers, and a suitable aqueous binder, such as a sugar solution, is supplied to a rotating drum (12). The mixture is supplied via a feed pipe (18) concentrically aligned with a screen (66) of the drum. The fibers and binder collect on a filter cloth (102) supported by an inner surface of the screen. Excess binder flows through the filter cloth and passes through adjacent apertures (100) in the screen. When a cylindrical preform of sufficient thickness has built up, the drum is disassembled. The preform is dried, to drive off excess water, and heated to a temperature of about 900.degree. C.-2000.degree. C. to form the casting.
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