科研之友
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摘要
Without impurity phases detected, fully dense (TiB2 + SiC)/Ti3SiC2 composites have been successfully synthesised by in-situ reaction hot pressing. The effect of TiB2 content on phase composite, sintering properties, microstructure, and mechanical properties of the composites were thoroughly investigated. With TiB2 content increasing from 0 to 50 vol.-%, the flexural strength increases first and then decreases, whereas fracture toughness, hardness and modulus show a linear increase. The maximum strength of 826 MPa was obtained at 20 vol.-% TiB2. On the whole, the (TiB2 + SiC)/Ti3SiC2 composites exhibit a superior comprehensive mechanical properties superior to other reported Ti3SiC2-based composites reinforced by singular reinforcement. The significant strengthening and toughening effect induced by the in-situ incorporated TiB2 can be ascribed to the unique properties of TiB2 and the synergistic action of many mechanisms including particle reinforcement, pulling out of grains, crack deflection and grain refinement strengthening.
