Abstract
Three B4C-based composites with 10, 20 and 30 vol% ZrB2-ZrC were prepared by reactive hot-pressing of Zr and B4C powders at 1900°C for 2 h under 20 MPa in Ar. Relative density of ∼96 % was obtained for 10 vol% ZrB2-ZrC, while relative density of >99 % was obtained for 20 and 30 vol% ZrB2-ZrC. The resulting composites were composed of B4C, ZrB2 and ZrC. The elastic moduli and hardness were insensitive to the ZrB2-ZrC content, whereas the fracture toughness increased with increasing ZrB2-ZrC content. In addition, the three compositions were fractured in four-point flexure at temperatures ranging from room temperature to 1600°C. At or below 1500°C, only linear stress-strain response was observed for each composition. Nonlinear response was observed in the stress-strain curves for temperature at 1600°C. The strength displayed by the three compositions was closely associated with the amount and characterization of ZrB2 and ZrC phases formed during the sintering.
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