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Huseynov, Asgar
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article
Reactive sintering of TiB2-SiC-CNT ceramics
Abstract
TiB2-SiC ceramics with multi-wall carbon nanotubes (MW-CNT) were reactively hot pressed at 1800 °C and 30 MPa. Carbon nanotubes survived the process and could be clearly observed in the sintered ceramics. The insitu exothermic reactions between TiC, B4C and Si accelerated the densification and produced nonporous TiB2- SiC ultrahigh-temperature ceramics within 1 min at 1800 °C. Although the toughness of the ceramic was not significantly affected by the CNT addition, remaining around 6 MPam1/2, the CNT presence resulted in a substantial<br/>improvement in TiB2-SiC thermal shock resistance. The Vickers hardness decreased from 27 GPa for the CNT-free matrix to 21 GPa for ceramic with maximum CNT content (7.4 wt%).