Relationship between Microstructure, Toughening Mechanisms, and Fracture Toughness of Reinforced Silicon Nitride Ceramics

1995/10/01 by Pavol Šajgalik, Pavol Šajgalı́k, J. Dusza +3 · 4 citations
Materials Science · Engineering · #Advanced ceramic materials synthesis #Advanced materials and composites #Metal and Thin Film Mechanics

paper · doi:10.1111/j.1151-2916.1995.tb08031.x

Abstract

Different microstructures in Si 3 N 4 ceramics containing Y 2 O 3 and Al 2 O 3 as sintering additives were prepared by two‐step sintering. Pull‐out and elastic bridging were most frequently observed as the toughening mechanisms in samples with fine‐grained microstructures having needlelike β‐Si 3 N 4 grains with diameters of <1 μm. Crack deflection was the main toughening mechanism observed in samples with coarse‐grained microstructures having grains with diameters of >1 μm. The values of fracture toughness were varied from 6.1 to 8.2 MPa·m 1/2 with respect to the microstructural characteristics, characterized by the volume fraction of needlelike grains and their diameter.

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