Elongation of α-SiC Particles in Spark Plasma Sintered α-SiAlON/α-SiC Composites


  • R. Shuba—contributing editor

  • This work was financially supported by China National Science Foundation under Grant No. 50632020, and China Postdoctoral Science Foundation under Grant No. 20090450957.

†Author to whom correspondence should be addressed. e-mail: liulimeng@hit.edu.cn


α-SiAlON/α-SiC composites with 0–40 wt%α-SiC were synthesized by spark plasma sintering for 5 min at 1800°C under 20 MPa pressure. A self-reinforcing microstructure with both elongated α-SiAlON and α-SiC grains, was formed. Flexural strength and fracture toughness were significantly improved due to the in situ reinforcement. High fracture toughness up to 8.2 MPa·m1/2 was obtained in the 40 wt% SiC composition.