Abstract
A bulk zirconium–tantalum diboride ceramic composite was consolidated by non-reactive spark plasma sintering (SPS) at 2300°C. In order to consolidate the ZrB2–44wt% TaB2 composite and restrict grain-growth, a special loading procedure was used. Pressure was applied and released at 2150°C and 1250°C, respectively. These SPS conditions allowed us to obtain a crack-free bulk composite with a grain size of 4–8μm. Flexural strength at temperatures up to 1800°C was measured for the ZrB2–TaB2 composite. Importantly, at 1600°C, the strength was 336±23MPa, which is superior to that of monolithic ZrB2. Moreover, the ZrB2–TaB2 composite only showed plastic behavior at 1800°C, a finding that is atypical for ZrB2-based ceramics.
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