Abstract
ZrB2–SiC ceramic composites were prepared through water-based gelcasting and pressureless sintering. Effects of the pressureless sintering temperature (1500–2000°C), heating rate (5–15°C/min) and soaking time (0.5–2h) on the relative density, microstructure and mechanical properties of the ZrB2–SiC composites were investigated in detail. A sintering temperature of 2000°C, a heating rate of 5°C/min and a soaking time of 2h were found to be the optimal pressureless sintering procedure. The relative density, flexural strength and fracture toughness of the ZrB2–SiC composite prepared under the optimum condition were 97.8%, 403.1±27.8MPa and 4.05±0.42MPa·m1/2, respectively.
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