Titanization of C/SiC composite fibers in KCl–LiCl–K2TiF6 salt melt and production of ceramics from them

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Abstract

Titanisation of C/SiC composite fibres with core-shell structure was carried out by synthesis in molten salts. A mixture of salts KCl, LiCl and K2TiF6 was used as the reaction medium, and metallic titanum powder was used as the titanising agent. The titanisation was carried out at a temperature of 800°C in a stationary argon atmosphere. Ceramic material was obtained from titanised fibres by hot pressing. The microstructure and phase composition of the fibres and hot pressed samples were investigated. It was found that Ti5Si3 and TiC phases are formed during titanation, and during hot pressing the Ti5Si3 phase reacts with the carbon core of C/SiC composite fibres to give titanium carbide TiC as a titanium-containing product. It was found that increasing the degree of titanisation leads to a decrease in porosity and an insignificant increase in strength of the obtained material.

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About the authors

E. I. Istomina

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Author for correspondence.
Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

P. V. Istomin

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

A. V. Nadutkin

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

V. E. Grass

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

I. M. Belyaev

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

O. G. Baeva

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

V. O. Tarasov

Institute of Chemistry of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

E. M. Tropnicov

Institute of Geology of Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”

Email: istomina-ei@yandex.ru
Russian Federation, Syktyvkar, 167982

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Supplementary files

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2. Fig. 1. Schematic diagram of a reactor for siliconizing carbon fibers [13,14]: a cylindrical corundum crucible with slit-shaped channels located along the entire height of the side wall (1); a sealing lid made of graphite foil (2); cylindrical corundum crucibles (3–5).

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3. Fig. 2. General scheme for obtaining a ceramic composite material from C/SiC fibers.

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4. Fig. 3. X-ray diffraction patterns of samples: original carbon fibers (a); C/SiC composite fibers (b); fibers titanated using salt composition A (c); fibers titanated using salt composition B (d); ceramic sample GP-A (d); ceramic sample GP-B (e).

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5. Fig. 4. Micrograph of a C/SiC composite fiber bundle in cross section and X-ray microanalysis spectra.

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6. Fig. 5. Electron microimage and X-ray diffraction spectra of titanated C/SiC fibers before the stage of washing the salt melt.

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7. Fig. 6. Electron microimages of titanated fibers and X-ray microanalysis spectra.

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8. Fig. 7. Electron microimages and X-ray diffraction spectra of a sample obtained by hot pressing of C/SiC composite fibers pre-titaniumized in a salt melt of composition A: microimage and X-ray diffraction spectra (a); elemental mapping (b–d).

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9. Fig. 8. Electron microimages and X-ray diffraction spectra of a sample obtained by hot pressing of C/SiC composite fibers pre-titaniumized in a salt melt of composition B: microimage and X-ray diffraction spectra (a); elemental mapping (b–d).

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10. Fig. 9. Electron microimage of the contact area of ​​titanated fibers after hot pressing for the GP-B sample.

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