Reaction Hot-Pressed Sintering of Grain-Refined TiB2-TiC Composites by AlN-SiC Solid Solution

Grain-refined TiB2-TiCx composites were designed and fabricated by reaction hot pressing under 30 MPa at 1800 °C choosing 4.8 Ti-B4C material system with Al, C and Si3N4 as additives. The microstructure of the resultant was homogeneously grain-refined TiB2-TiCx matrix reinforced by AlN-SiC solid solution particles that were embedding tiny TiB2-TiCx crystals. The obtained specimen showed relative high flexural strength of 860±30 MPa and fracture toughness of 13.6±0.3 MPa·m1/2, which can be explained by several toughening mechanisms.

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