Abstract
Binderless tungsten carbide with varied amounts of ZrC nano-powder (0–9wt.%) were prepared by spark plasma sintering at 1600°C under an applied pressure of 50MPa. The effect of ZrC nano-powder addition on the densification behavior, phase composition, microstructure and mechanical properties of the composites were investigated. With appropriate amount of ZrC nano-powder, the coarsening and abnormal growth of WC grains were suppressed, resulting in more homogeneous microstructure of the materials. The Vickers hardness, flexural strength and fracture toughness of the as-prepared composites first increased and then decreased with increasing addition fraction of ZrC nano-powder. When the added fraction of ZrC nano-powder was 1wt.%, the hardness and fracture toughness reached their maximum values of about 2800HV10 and 8.1MPa·m1/2, respectively. When the added fraction of ZrC nano-powder was 3wt.%, the flexural strength presented its maximum value of about 1100MPa.
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