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A process for production of titanium aluminide: Reaction mechanism

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Abstract

A new combustion synthesis process for production of TiAl from TiO2, Al, Ca and KClO4 has been developed. In a closed reaction vessel, this process gets started at about 505°C with the reaction between Ca and KClO4 yielding CaO and KCl. Subsequent two-stage reaction between TiO2 and Al leads to formation of titanium aluminides and α-Al2O3. Then the reaction between α-Al2O3 and CaO results in formation of CaAl4O7 (grossite). The overall reaction scheme can be represented as 6TiO2 + 22Al + 4KClO4 + 4Ca = 6TiAl + 4CaAl4O7 + 4KCl. The temperature reached in the process (1950°C) is high enough for the melting of TiAl and CaAl4O7 and evaporation of KCl.

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Authors and Affiliations

  1. Department of Materials and Metallurgy Engineering, Iran University of Science and Technology, Tehran, Iran

    A. R. Kamali & H. Razavizadeh

  2. Department of Mining, Amir Kabir University, Tehran, Iran

    S. M. M. Hadavi

Authors
  1. A. R. Kamali
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  2. H. Razavizadeh
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  3. S. M. M. Hadavi
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Correspondence to A. R. Kamali.

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Kamali, A.R., Razavizadeh, H. & Hadavi, S.M.M. A process for production of titanium aluminide: Reaction mechanism. Int. J Self-Propag. High-Temp. Synth. 16, 119–124 (2007). https://doi.org/10.3103/S106138620703003X

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  • DOI: https://doi.org/10.3103/S106138620703003X

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