The influence of high pressure on TiC-B4C reaction kinetics

Popov, Oleksii; Klepko, Alexandra; Lutsak, E. M.

doi:10.1016/j.ijrmhm.2018.05.004

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…As has been shown earlier [19,21], TiC-B4C high temperature reaction starts with boron evaporation from boron carbide surface. It can be seen from Fig.…”

Section: Discussionsupporting

confidence: 58%

“…This suggests that the carbon crystallization is a relatively slow process which continues after the main reaction completion. Hence, here we can see the initial stage, as shown in [19,21] Foam-like carbon cannot prevent transportation of sublimated boron. As the result, green body boron carbide grain size distribution does not affect the speed of decomposition.…”

Section: Evolution Of B4c During High Temperature Decomposition and Mmentioning

confidence: 77%

“…One of the most valuable ways to create the mentioned ceramics is the reactive hot pressing of TiC-B4C precursors [18]. The process bases on quick (for 1 min at 1800 °C [19]) precursor disappearance accompanied with TiB2 and graphite solid phase synthesizing. During the process, titanium diboride forms the material hard matrix, while graphite can be observed as (i) 2 -4 μm sponge-like areas or (ii) submicron platelets [18].…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction

Popov

Vishnyakov

Chornobuk

et al. 2019

Ceramics International

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Reactive hot pressing of TiC-B4C precursors was undertaken at 1800 ℃ to produce TiB2 with carbon inclusions. Atomic mechanisms of titanium diboride nucleation, as well as spongelike carbon inclusions and submicron platelets of graphite precipitation has been investigated. Precursor grain size, green body composition and synthesis time were varied to analyse phases transformation. Boron from B4C grain sublimation is shown to result in carbon-based foam formation. Ab-initio calculations confirm that the boron atoms accumulation on (111) TiC plains leads to tensile stress. The developed stress cleaves TiC grains and enhances further reaction. Most of carbon expelled from TiC during its transformation into TiB2 forms graphite platelets.

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“…As has been shown earlier [19,21], TiC-B4C high temperature reaction starts with boron evaporation from boron carbide surface. It can be seen from Fig.…”

Section: Discussionsupporting

confidence: 58%

Section: Evolution Of B4c During High Temperature Decomposition and Mmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction

Popov

Vishnyakov

Chornobuk

et al. 2019

Ceramics International

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“…Chornobuk et al [18] created TiB2-SiC-C composites via hot pressing of a TiC-B4C-Si precursor powder mixture at 2150°C for 8 min. Recent investigations of the TiC-B4C high temperature interaction [19,20,21] however showed that the reaction can be finalized in 1-2 minutes at 1800°C.…”

Section: Introductionmentioning

confidence: 99%

Reactive sintering of TiB2-SiC-CNT ceramics

Popov

Zhang

Huseynov³

et al. 2019

Ceramics International

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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 in-situ exothermic reactions between TiC, B4C and Si accelerated the densification and produced nonporous TiB2-SiC ultrahigh-temperature ceramics within one minute at 1800 °C. Although the toughness of the ceramic was not significantly affected by the CNT addition, remaining around 6 MPa•m 1/2 , the CNT presence resulted in a substantial improvement in TiB2-SiC thermal shock resistance. The Vickers hardness decreased from 27GPa for the CNT-free matrix to 21GPa for ceramic with maximum CNT content (7.4 wt.%).

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“…A simple method to improve toughness for ceramics in general is to create composites. Moreover, ceramic composites with sophisticated microstructure can be sintered at reduced temperature compared to monolithic ceramics [2,8,20,21]. In B 4 C based ceramic composites, a secondary phase, such as boride and carbide, added in the B 4 C matrix can serve as reinforcing and toughening phase, which can also reduce the sintering temperature [2,8,10].…”

Section: Introductionmentioning

confidence: 99%

Reactive sintering of B4c-TiB2 composites from B4 and TiO2 precursors

Švec

Gábrišová

Brusilová

2020

PAC

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The effect of sintering temperature in the interval from 1775 to 1850?C on the density, microstructure, hardness and fracture toughness of ceramic composites consisting of a boron carbide matrix and titanium diboride secondary phase was studied. The composites were hot pressed using in situ reaction between boron carbide and 40 wt.% of titanium dioxide additive. The samples were hot pressed at different temperatures but for the constant time of 60min, under the pressure of 35MPa in vacuum of 10 Pa. Both Vickers hardness and fracture toughness of the composites increased with the sintering temperature.Maximal hardness of 29.8GPa and fracture toughness of 6.9MPa?m1/2 were achieved for the composite with 29.6 vol.% of titanium diboride secondary phase sintered at the highest sintering temperature of 1850?C.

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The influence of high pressure on TiC-B4C reaction kinetics

Cited by 14 publications

References 18 publications

Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction

Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction

Reactive sintering of TiB2-SiC-CNT ceramics

Reactive sintering of B4c-TiB2 composites from B4 and TiO2 precursors

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