Abstract
Nano-structured Si<sub>2</sub>N<sub>2</sub>O-Sialon composites were prepared by liquid phase sintering method with the amorphous nano-sized Si<sub>3</sub>N<sub>4</sub> and nano-sized AlN powders. Nano-sized Al<sub>2</sub>O<sub>3</sub> and Y<sub>2</sub>O<sub>3</sub> powders synthesized by polyacrylamide gel method were introduced as additives. High relative density 98.6% was observed at low sintering temperature of 1600 °C. XRD analysis indicates that the sintered body consisted of Sialon and Si<sub>2</sub>N<sub>2</sub>O crystalline phases. SEM and TEM examination confirmed the grain size of sintered body was less than 80nm. The high hardness 22.5GPa and high flexural strength 895MPa were obtained.
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