Abstract
A new Si 3N 4/Ti 3SiC 2 laminated composite which was manufactured by the powder metallurgy method is presented. The work of fracture was measured in four-point bending at a crosshead speed of 0.05 mm/min. The results show that the mechanical properties of multilayered composites consisting of Ti 3SiC 2 layers in Si 3N 4 were significantly enhanced. Three-step toughening behaviors were found in the material. The crack deflection is regarded as a dominant toughening mechanism, meanwhile the unique microstructure and properties of Ti 3SiC 2 contributed to the improvement, thus preventing catastrophic failure.
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