Silicon nitride-silicon carbide nanocomposites prepared by water processing of commercially available powders

T. Kennedy, M. Poorteman, F. Cambier, S. Hampshire

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)1917-1923
Number of pages7
JournalJournal of the European Ceramic Society
Volume17
Issue number15-16
DOIs
Publication statusPublished - 1997

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