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Abstract
Abstract
Effect of nano-TiN particles on the microstructure and mechanical properties of Si3N4 based cearmics were investigated. The nanocomposites were fabricated by hot pressing Si3N4 and TiN nanopowders. The main phases in nanocomposites were α-Si3N4, β-Si3N4, Si2N2O and TiN. Proper addition of TiN nanoparticles can significantly increase the flexural strength and the fracture toughness. The maximum values of the fracture toughness and the flexural strength were obtained when the content of TiN particles was 10 and 15 wt-% respectively. The hardness of the nanocomposite slightly decreased with the addition of nano-TiN particles. The main strengthening and toughening mechanisms are the crack tip bridging and the crack deflection by TiN particles.