Dispersion, Slip Casting and Reaction Nitridation of Silicon

Ramachandra Rao, R and Roopa, HN and Kannan, TS (1999) Dispersion, Slip Casting and Reaction Nitridation of Silicon. Journal of the European Ceramic Society 19 (1999) , 19. pp. 2145-2153. ISSN 0955-2219

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The dispersing behavior of silicon, silicon carbide and their mixtures in aqueous media were monitored by particle size, sedimentation, viscosity and zeta potential analyses as a function of pH of the slurry. The pH values for optimum dispersion were found to be 4 and 8 for silicon, 10 for SiC and 9 for Si+SiC mixtures. Optimum slips of Si+SiC mixtures were slip cast to obtain green compacts which were nitride once at 1450 C for 2 or 4 h or successively and cumulatively for 8 (2+6) and 10 (4+6) h in a resistively heated graphite furnace. The binding phases in the nitride products were found to be brous/needle like a-Si3N4, ¯aky grains of b-Si3N4 and Si2ON2. The products containing 19±47% of silicon nitride as bond/matrix possessed flexural strength (three-point bending values of 50±85 MPa.

Item Type: Article
Uncontrolled Keywords: nitridation, slip casting, suspensions, SiC, Si.
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms Indrani V
Date Deposited: 02 Jan 2014 10:24
Last Modified: 02 Jan 2014 10:24
URI: http://nal-ir.nal.res.in/id/eprint/11884

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