Various contents of TiB2 particles were added to Si3N4 with 6 wt.% Y2O3 and 2 wt.% Al2O3 as sintering additives. Samples were sintered at different temperatures (1850, 1800 and 1750°C) ad in different atmospheres (9 atm N2, 1 atm N2 and 1 atm argon) to investigate the effects of sintering conditions. TiN was found in every TiB2-containing sample through the reaction between N2 and TiB2 near TiB2 surfaces. This reaction becomes more prominent as the temperature or N2 pressure increases. The source of nitrogen gas for the reaction could be the dissociation of Si3N4 or the ambient atmosphere. Micropores are commonly observed near the reaction zone. Further chemical characterization and mechanical testing work should be conducted in order to understand more about the chemical reaction and to investigate its effects on mechanical properties.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering