A new process of preparing SiC-TiB2 particulate-reinforced composite by in-situ synthesis has been developed TiB2 particles were formed in situ by chemical reaction between TiH2, Si and B4C; the particle size of the TiB2 is usually about 2 mu m. The composite containing 30 vol% TiB2 exhibited a facture toughness of 6.21 MPa m(1/2) and a flexural strength of 400 MPa. It was suggested that the main toughening mechanisms are the thermal residual stress field, crack bridging by TiB2 particles and crack deflection around TiB2 particles.
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