Abstract
A ZrB 2 ceramic containing 20 vol.% SiC and 10 vol.% graphite flake (ZrB 2–SiC–G) was fabricated by hot pressing. It was shown that the fracture toughness was improved due to the introduction of graphite flake, whereas the flexure strength and hardness decreased slightly. The fracture toughness of ZrB 2–SiC–G composite was 6.1 ± 0.3 MPa·m 1/2, which was much higher than that of monolithic ZrB 2, ZrB 2–SiC composite and similar ZrB 2–SiC–C composite. The toughening mechanisms are crack deflection and branching as well as stress relaxation near the crack tip. The results here pointed to a potential method for improving fracture toughness of ZrB 2-based ceramics.
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