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| Naji, M. |
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| Azevedo, Nuno Monteiro |
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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
Fracture toughness in some hetero-modulus composite carbides
Abstract
<p>Structure and mechanical characteristics of dense ceramic composites synthesised by reactive hot pressing of TiC–B<sub>4</sub>C powder mixtures at 1800–1950°C under 30 MPa were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM and EDX). The results show that during hot pressing solid-phase chemical reaction 2TiC + B<sub>4</sub>C = 2TiB<sub>2</sub> + 3C has occurred with final products like TiB<sub>2</sub>–TiC–C, TiB<sub>2</sub>–C or TiB<sub>2</sub>–B<sub>4</sub>C–C hetero-modulus composite formation with around one micrometer size carbon precipitates. The fracture toughness depends on the amount of graphite precipitation and has a distinct maximum K1C = 10 MPa m<sup>1/2</sup> at nearly 7 vol.-% of carbon precipitate. The fracture toughness behaviour is explained by the developed model of crack propagation. Within the model, it is shown that pores (voids) and low-modulus carbon inclusions blunt the cracks and can increase ceramic toughness in some cases.</p>