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Zeynalov, Eldar
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article
Reactive hot pressing route for dense ZrB2-SiC and ZrB2-SiC-CNT ultra-high temperature ceramics
Abstract
<p>The in-situ exothermic reactions between ZrC<sub>0.8</sub>, B<sub>4</sub>C and Si have assisted densification and allowed to obtain fully dense ZrB<sub>2</sub>-31 wt.%SiC ultra-high temperature ceramics within 6 min at 1750 °C. The use of zirconium carbide instead of metallic zirconium in the green body obviated the possibility of in-situ SHS process and allowed to apply the pressure at low temperatures. The latter provided a first densification stage just above 1050 °C. A slight carbon excess was created in the green body to preserve the carbon nanotubes. The developed reactive hot pressing route (1830 °C, 3 min, 30 MPa) has been successfully used to obtain ZrB<sub>2</sub>-SiC ceramics containing 8 vol.% of multi-wall carbon nanotubes (MW-CNT). The carbon nanotubes survived the thermal cycle and could be clearly observed in the sintered ceramics. The CNT addition improved the fracture toughness of the composite from 4.3 MPa m<sup>1/2</sup> for ZrB<sub>2</sub>-31 wt.%SiC to 6.8 MPa m<sup>1/2</sup> for ZrB<sub>2</sub>-29 wt.%SiC-CNT.</p>