Abstract
Dispersion of nano-sized silicon carbide powders in silicon nitride was examined. Zeta potential was measured over a range of pH values and the aqueous dispersion of nano-sized silicon carbide powders in silicon nitride matrix was optimised. Ultrafine silicon carbide, 30-200 nm, which had agglomerated in organic media leading to a degradation in strength, was well dispersed and acted to reinforce silicon nitride matrix material. Densification of these nanocomposites was also examined. They were densified to 98-99% theoretical density by hot pressing, gas pressure sintering and pressure less sintering. Flexural strengths were measured and nanocomposites densified by the different routes were compared. Gas pressure-sintered nanocomposites had strengths comparable to the hot pressed materials. Gas pressure sintering was identified as a viable densification route for these materials as it does not have the size and shape limitations associated with hot pressing.
Original language | English |
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Pages (from-to) | 1917-1923 |
Number of pages | 7 |
Journal | Journal of the European Ceramic Society |
Volume | 17 |
Issue number | 15-16 |
DOIs | |
Publication status | Published - 1997 |