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Popov, O.
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Publications (4/4 displayed)
- 2021Thermal conductivity and thermal shock resistance of TiB2-based UHTCs enhanced by graphite plateletscitations
- 2019Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interactioncitations
- 2017Structure formation of TiB2-TiC-B4C-C hetero-modulus ceramics via reaction hot pressingcitations
- 2017Fracture toughness in some hetero-modulus composite carbidescitations
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article
Thermal conductivity and thermal shock resistance of TiB2-based UHTCs enhanced by graphite platelets
Abstract
<p>TiB<sub>2</sub>-SiC-C and TiB<sub>2</sub>-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B<sub>4</sub>C-Si and TiC-B<sub>4</sub>C precursors at 1830 °C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B<sub>4</sub>C-Si green body create submicron (100–400 nm) TiB<sub>2</sub> crystals inside silicon carbide grains as well as B<sub>x</sub>Si<sub>y</sub>C<sub>z</sub> nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets are formed within the hard matrix during the in-situ exothermic reaction. “Soft-hard” grain combination produces substantially improved fracture toughness (up to 9 MPa m<sup>1/2</sup>). The materials also demonstrate high thermal conductivity (up to 120 W/m∙K) and high thermal shock resistance. The thermal shock crack growth is arrested by the graphite platelets.</p>