Abstract
FeSi/Si3N4 composites were synthesized in situ by hot pressing of a powder mixture of Si3N4 and Fe3Al under a pressure of 40MPa at a temperature of 1750°C for 1h, resulting in the formation of FeSi. The effect of the addition of Fe3Al to the raw material on the fracture toughness, densification, hardness and grain size of the composites was investigated. The microstructure analysis, compositional investigation as well as mechanical characterization have been performed. The experimental results showed that Si3N4 composites with 4wt.% Fe3Al in the prematerial powder mixture possessed the most superior fracture toughness within the experimental range. Crack bridging, crack deflection and grains pull-out were identified as toughening mechanisms for the FeSi/Si3N4 composites.
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