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WC-10 wt.% Si 3 N 4  composites toughened with ultrafine porous boron nitride nanofiber (0, 0.01, 0.05, 0.1, and 0.15 wt.%) were prepared for the first time by spark plasma sintering. Compared with the WC-Si 3 N 4  composite sintered in the same condition, the obtained WC-10 wt.% Si 3 N 4  composites with ultrafine porous boron nitride were found to possess better hardness and fracture toughness. In addition, the Si 3 N 4  phase in the UPBNNF toughened composites did not exhibit traditional catastrophic fracture as indicated in most investigations. In this study, the phenomena are discussed, and a probable mechanism is elucidated. It is deduced that the approach could be extended to materials with a feature of internal liquid phase during the sintering process and could improve hardness and fracture toughness.

Mechanical Properties of WC-Si3N4 Composites With Ultrafine Porous Boron Nitride Nanofiber Additive