Abstract
ZrB2 powder was successfully densified with Mo, Fe and carbon as sintering aid by pressure-less sintering method. Effects of the above additives were investigated on the densification, microstructure and mechanical properties (hardness, fracture toughness and compressive strength) of sintered samples. It was observed that the ZrB2 samples with 10wt%Fe and 15wt%Mo with 1wt%C had the maximum density. The maximum compressive strength and fracture toughness of 425MPa and 12.5MPam1/2 were obtained for ZrB2–10wt%Mo–1wt%C, respectively. Fracture toughness of ZrB2–10wt%Fe was significantly improved at higher carbon content (2wt%).
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