Microstructure and Mechanical Properties of Ca-α-Sialon with Low Oxygen Content
Ca-α-sialons with low oxygen content were fabricated at 1800°C by hot pressing. The phase and microstructure were characterized by XRD and SEM. The calculated lattice parameter reveals that 20~30% Ca2+ ions still exist in the grain boundary phase of Ca-α′. A large amount of Ca-containing liquid phase efficiently promotes the anisotropic growth of α′ grains in Ca-rich composition. Reinforced only by elongated α′ grains, the fracture toughness of Ca-α′ can reach 4.96 MPa•m1/2.
Hyungsun Kim, JianFeng Yang, Tohru Sekino, Masakazu Anpo and Soo Wohn Lee
Z. F. Yang et al., "Microstructure and Mechanical Properties of Ca-α-Sialon with Low Oxygen Content", Materials Science Forum, Vol. 658, pp. 412-415, 2010