Abstract
Spark plasma sintering technique was utilized to densify the hybrid ZrB2-based UHTCs co-toughened with SiC whiskers and different weights of graphite nano-flakes. The role of nano-graphite on the structure, hardness, densification, and toughness characteristics of ZrB2–SiCw–graphite nanocomposites were inspected. Although all UHTC matrix composites approached to full densification, a 100% dense ceramic was obtained by the incorporation of 5 wt% graphite nano-flakes. The grain coarsening phenomenon stopped significantly in the presence of carbonaceous nano-additive. Phase and microstructural investigations revealed that no in-situ phases were formed during the SPS consolidation, owing to the non-reactivity of ZrB2–SiCw–graphite system. The Vickers hardness dropped slightly from 22 to 19.5 GPa with increasing the nano-graphite content. However, the fracture toughness approached 6.2 MPa.m½ by the incorporation of 5 wt% graphite nano-flakes, remarkably tougher than that of graphitic-carbon-free ceramic with a toughness of 4.7 MPa·m½.
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