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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...