Method for manufacturing an anti-oxidation system for porous ceramics on the basis of SIC and Si.sub.3 N.sub.4
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United States of America Patent
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Nov 7, 2000
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N/A
app pub date -
Aug 28, 1997
filing date -
Aug 28, 1996
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Abstract
The invention relates to a method of manufacturing an anti-oxidation system for porous ceramics on the basis of SiC or Si.sub.3 N.sub.4. By means of infiltration into the pore inner spaces of a sol containing at least one metal component, conversion of the sol to a gel (sol-gel process) and a subsequent high-temperature treatment, it is possible successfully to provide a crystalline anti-oxidation layer, which is resistant to temperatures of up to at least 1650.degree. C. even under cyclic temperature stresses, and reveals a heat expansion behavior adapted to the SiC or Si.sub.3 N.sub.4 over the entire temperature range used.
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