Colloidal processing of SiC whisker composites
- Shanghai Institute of Ceramics (China)
In the present study, the dispersion processing and the characterization of the dispersity of SiC whiskers for reinforced ceramic-based composites were studied. Two kinds of methods were used to determine the dispersity of SiC whiskers. First, the sedimentation density was employed to directly characterize the dispersity of the SiC whiskers. The other is an indirect characterization. The dispersity and the distribution of the SiC whisker in a ceramic matrix were analyzed and characterized indirectly with SEM observation and the determination of the relative density. By means of the colloidal processing of the whiskers in which electrostatic and steric interaction were used to counteract the attractive forces between whiskers, four dispersion processing routes were used to mix the SiC whisker into the Al{sub 2}O{sub 3} powder. The sedimentation results indicated that, with aluminum alkoxide as a dispersant, SiC whiskers were completely deflocculated and the sedimentation density increased twofold from 8.5% to 24% of theoretical density, and both the homogeneous distribution of SiC whiskers and densification of the 30 vol% SiC whisker-reinforced Al{sub 2}O{sub 3} (AS) were achieved by hot pressing. The relative density of the AS composites was more than 99,7%. SEM observation showed no agglomeration of SiC whiskers.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 106017
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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