Fabrication of refractory insulating materials consisting essentially of a carbon matrix containing a dispersion of SiC- or Si.sub.3 N.sub.4 -lined voids
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United States of America Patent
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Sep 6, 1988
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N/A
app pub date -
Jul 28, 1986
filing date -
Jul 28, 1986
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Expired
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Abstract
A process for fabrication of refractory insulating materials wherein essentially pure silica shells are mixed with a polymeric graphite precursor dissolved in a solvent. The resulting slurry is placed in a forming mold, and the solvent is evaporated to form a polymeric matrix containing the shells as a dispersion. This matrix is pyrolized under an inert or reducing atmosphere to decompose the polymer and form a first product consisting essentially of a carbon matrix containing a dispersion of silica shells. To enhance refractory characteristics, such first product is fired at high temperature in an inert or reducing atmosphere to form a second product consisting of a carbon matrix containing a dispersion of SiC-lined voids, or in a nitrogen atmosphere to form a third product consisting of the carbon matrix containing a dispersion of Si.sub.3 N.sub.4 -lined voids.
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