| Résumé | This study analyzed the characterization of high temperature strength of Si₃N₄ composite ceramics additive based on variations in the amount of nano colloidal SiO₂ added. Semi-elliptical cracks about 100 m length were obtained from a Vickers indenter using a load of 24.5 N. The results showed μ that the heat-treated smooth specimens with SiO₂ nano colloidal coating exhibited the highest bending strength at 0.0 wt% SiO₂ nano colloidal added, which is amounted to a 187 % increase over that of smooth specimen. Limiting temperature for bending strength of crack-healed zone for bending strength was about 1273 K. However, the bending strength of SSTS-3 and SSTS-4 was considerably increased while that of SSTS-1 and SSTS-2 was decreased at a temperature of 1,573K. |
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