Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Utilizing sol or gel
Patent
1997-08-28
2000-11-07
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Utilizing sol or gel
264642, 264643, 427226, 427314, 427375, 4273761, 4273762, 4273722, C04B 36624
Patent
active
061432393
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.
REFERENCES:
patent: 5120576 (1992-06-01), Goldsmith
patent: 5268199 (1993-12-01), Brown, Jr.
Abstract of JP 62123949 Nov. 25, 1998.
WPIDS Copyright 1997 Derwent Information Ltd.
Effect of Siloxane Infiltration of Green Samples on Properties of RBSN, In European Ceramic Society 10, 1992, pp. 205-211.
Sol-Gel Preparation of Ceramics and Glasses in Met. Mater,14,1988, pp. 748-751.
Low-Shrinkage refractories by An Infiltration Technique, In European Ceramic Society, 14, 1994.
Derrington James
W. Haldenwanger Technische Keramik GmbH & Co. KG
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