Abstract
Tantalum diboride (TaB2) is an important transition metal (TM) diboride that has attracted considerable scientific and industrial interest. Herein, we fabricated TaB2 ceramic samples by combining high-pressure sintering with high-energy ball milling (HEBM) and investigated their microstructure and mechanical properties under high pressure at different sintering temperatures; these results were also compared with those of the bulk TaB2 ceramic. Thus, we evaluated the Vickers hardness, fracture toughness, Young's modulus, and relative density of our TaB2 ceramic at 1200 °C, under 5.5 GPa, to be 26 GPa, 3.8 MPa m1/2, 402 GPa, and 95.11%, respectively. Furthermore, we observed that the Vickers hardness, thermal stability, and fracture toughness are critically controlled with grain size and microstructures of the samples. These observations provide not only useful insights into the physical properties of TaB2 under high pressure and temperatures, but also avenues for the synthesis and design of novel functional ceramics.
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