Abstract—
We have studied the desilicidation of Ti3SiC2 MAX phase powder at 1600°C in a CO + xSiO (x = 0, 1, 1.5, 2, 3) gas atmosphere. The required gaseous atmosphere was generated using granulated powder mixtures containing commercial carbon, TiO2, SiO2, and SiC, which released CO and SiO gases during heating as a result of oxide reduction reactions. Ti3SiC2 desilicidation was sensitive to the gas phase composition and occurred only if the CO : SiO ratio exceeded 1 : 3 (x < 3). The Ti3SiC2 desilicidation process was shown to be reverse of TiC silicidation with SiO gas and could be described by the following chemical reaction scheme: Ti3SiC2 + CO(g) = 3TiC + SiO(g).
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ACKNOWLEDGMENTS
In this study, we used equipment at the Khimiya Shared Research Facilities Center, Institute of Chemistry, Komi Scientific Center, Ural Branch, Russian Academy of Sciences.
Funding
This work was supported by the Russian Foundation for Basic Research, grant no. 19-08-00131.
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Translated by O. Tsarev
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Istomina, E.I., Istomin, P.V., Nadutkin, A.V. et al. Desilicidation of the Ti3SiC2 MAX Phase in a CO and SiO Atmosphere. Inorg Mater 56, 1217–1224 (2020). https://doi.org/10.1134/S0020168520120079
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DOI: https://doi.org/10.1134/S0020168520120079