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Thermal shock resistance and fracture toughness of liquid-phase-sintered SiC-based ceramics

2009; Elsevier BV; Volume: 29; Issue: 11 Linguagem: Inglês

10.1016/j.jeurceramsoc.2009.01.021

1873-619X

Alexandra Kovalčíková, Ján Dusza, Pavol Šajgalı́k,

Metal and Thin Film Mechanics

The effect of the heat treatment on the toughness and thermal shock resistance of the silicon carbide–silicon nitride composites prepared by liquid-phase-sintering was investigated. The fracture toughness has been estimated using the indentation method and the thermal shock resistance was studied using the indentation-quench method. The results were compared to those obtained for a reference silicon carbide material, prepared by the same fabrication route. The indentation toughness increased from 2.88 to 5.39 MPa m1/2 due to the toughening mechanisms (crack deflection, mechanical interlocking and crack branching) occurring in the heat-treated materials during the crack propagation. Similarly the thermal shock resistance increased after the heat treatment of the experimental materials.