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

O. Popov, V. Vishnyakov, S. Chornobuk, I. Totsky, I. Plyushchay

Research output: Contribution to journalArticle

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Abstract

Reactive hot pressing of TiC–B4C precursors was undertaken at 1800 °C to produce TiB2 with carbon inclusions. Atomic mechanisms of titanium diboride nucleation, as well as sponge-like carbon inclusions and submicron platelets of graphite precipitation have been investigated. Precursor grain size, green body composition and synthesis time were varied to analyze phase transformation. The carbon left after B4C high temperature decomposition is shown remaining as graphite sponge-like inclusions. 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 submicron platelets.

Original languageEnglish
Pages (from-to)16740-16747
Number of pages8
JournalCeramics International
Volume45
Issue number14
Early online date22 May 2019
DOIs
Publication statusPublished - 1 Oct 2019

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Graphite
Nucleation
Carbon
Platelets
Temperature
Boron
Hot pressing
Tensile stress
Titanium
Phase transitions
Decomposition
Atoms
Chemical analysis

Cite this

Popov, O. ; Vishnyakov, V. ; Chornobuk, S. ; Totsky, I. ; Plyushchay, I. / Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction. In: Ceramics International. 2019 ; Vol. 45, No. 14. pp. 16740-16747.
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Mechanisms of TiB2 and graphite nucleation during TiC–B4C high temperature interaction. / Popov, O.; Vishnyakov, V.; Chornobuk, S.; Totsky, I.; Plyushchay, I.

In: Ceramics International, Vol. 45, No. 14, 01.10.2019, p. 16740-16747.

Research output: Contribution to journalArticle

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AB - Reactive hot pressing of TiC–B4C precursors was undertaken at 1800 °C to produce TiB2 with carbon inclusions. Atomic mechanisms of titanium diboride nucleation, as well as sponge-like carbon inclusions and submicron platelets of graphite precipitation have been investigated. Precursor grain size, green body composition and synthesis time were varied to analyze phase transformation. The carbon left after B4C high temperature decomposition is shown remaining as graphite sponge-like inclusions. 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 submicron platelets.

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