Sol-Gel Processing of SiC-Whisker-Reinforced Silica-Based Ceramic Composites

SiC whiskers were added to reinforce a gel‐derived SiO2–Al2O3–Cr2O3 matrix. Alumina and chromia were added to induce reaction sintering of the composites. A maximum of ∼90% of theoretical density was achieved after firing in argon for 2 h at 1400°C. The optimum amounts of alumina, chromia, and SiC w...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1989-12, Vol.72 (12), p.2381-2385
Main Authors: Lee, Burtrand I., Park, Seung-Yong
Format: Article
Language:English
Subjects:
alumina
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
composites
Exact sciences and technology
silicon carbide
sintering
Technical ceramics
whiskers
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Summary:SiC whiskers were added to reinforce a gel‐derived SiO2–Al2O3–Cr2O3 matrix. Alumina and chromia were added to induce reaction sintering of the composites. A maximum of ∼90% of theoretical density was achieved after firing in argon for 2 h at 1400°C. The optimum amounts of alumina, chromia, and SiC were 26.5, 1.6, and 4.1 vol%, respectively. It was shown that the chromium acetate hydroxide, used as a precursor for chromia, acted as a gelling agent and as a sintering additive. The effect of producing gaseous products such as SiO, CO and/or CrO3 became significant above 1400°C where mullite formation also occurred. However, the measured mechanical properties were remarkable, considering the experimental conditions applied.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1989.tb06096.x