Microstructure and Mechanical Properties of Ca-α-Sialon with Low Oxygen Content

Zhang Fu Yang; Hao Wang; Xin Min Min; Wei Min Wang; Zheng Yi Fu

doi:10.4028/www.scientific.net/MSF.658.412

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HomeMaterials Science ForumMaterials Science Forum Vol. 658Microstructure and Mechanical Properties of...

Microstructure and Mechanical Properties of Ca-α-Sialon with Low Oxygen Content

Abstract:

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.