Reaction sintered β′-sialon ceramics Si6-zAlzOzN8-z, were prepared by slip casting from α-Si3N4, Al2O3, and AlN starting powders. The mechanical properties and microstructures of sintered bodies were investigated as a function of composition (varying the z value). The maximum value of the flexural strength, ∼ 600 MPa, and fracture toughness, ∼ 4.1 MPa m1/2 were observed in the z range of 0.5–1. In the z value range of 2–4, the mechanical properties decreased drastically. This phenomenon is attributed to the variation of fracture energy, which is greatly affected by the sintered crystallite size.
Fracture Toughness Crystallite Size Fracture Energy Sialon Fracture Face
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