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Thermodynamic Analysis of the CaO–Y2O3–ZrO2–Ti–Fe2O3 System as a Precursor for SHS-Produced Pyrochlore-Based Ceramics

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Abstract

The paper reports on the thermodynamic analysis of the CaO–Y2O3–ZrO2–Ti–Fe2O3 system as a precursor for SHS-produced pyrochlore-based ceramics. Adiabatic combustion temperature Tad and equilibrium concentration of pyrochlore were first calculated for the quasi-ternary system Y2O3–ZrO2–(Ti + Fe2O3) containing no CaO. It was found that, in the presence of CaO, a best yield of Zr-enriched pyrochlore ceramic can be reached within the following domain of green compositions (wt %): CaO 2.5–5.0, Y2O3 22.5–35.0, ZrO2 7.5–22.5, and (40% Ti + 60% Fe2O3) 45.0–60.0; within this domain, Tad = 2100–2400°K. Although in control experiments Tad was found to be within the range 1700–1970 K, nevertheless the combustion products always showed the presence of pyrochlore-based ceramic, as predicted by thermodynamic analysis.

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Funding

This work was financially supported by the Belarussian Foundation for Basic Research (project no. Т16Р-055) and the Russian Foundation for Basic Research (project no. 16-53-00084).

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Authors and Affiliations

  1. Physicotechnical Institute, National Academy of Sciences, Minsk, Belarus

    K. B. Podbolotov & B. B. Khina

  2. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow, Russia

    T. V. Barinova

  3. Belarussian State Economical University, Minsk, Belarus

    M. V. Velichko

Authors
  1. K. B. Podbolotov
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  2. T. V. Barinova
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  3. B. B. Khina
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  4. M. V. Velichko
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Correspondence to K. B. Podbolotov, T. V. Barinova or B. B. Khina.

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Translated by Yu. Scheck

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Podbolotov, K.B., Barinova, T.V., Khina, B.B. et al. Thermodynamic Analysis of the CaO–Y2O3–ZrO2–Ti–Fe2O3 System as a Precursor for SHS-Produced Pyrochlore-Based Ceramics. Int. J Self-Propag. High-Temp. Synth. 28, 239–244 (2019). https://doi.org/10.3103/S1061386219040113

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