Chapter 83. Kinetics and Phase Evolution During Carbothermal Synthesis of Titanium Carbide

  1. J. P. Singh
  1. Rasit Koc

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch83

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Koc, R. (1997) Kinetics and Phase Evolution During Carbothermal Synthesis of Titanium Carbide, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch83

Author Information

  1. Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • pyrolitic carbon;
  • purification;
  • activation energy;
  • endothermic;
  • carbothermal synthesis

Summary

The kinetics and phase evolution of the TiC formation process by carbothermal reduction of carbon coated titania (TiO2) (surface area of 64 m2/g) and TiO2/carbon black (surface area of 220 m2/g) mixture were studied using TGA, XRD, and chemical analysis (oxygen and total carbon content). A higher reactivity of the carbon coated titania precursor as compared to the titania/carbon black mixture was observed. The TiC synthesis from the carbon coated titania proceeded via forming titanium oxycarbide (TiCxOy) followed by its purification toward titanium carbide (TiC). The formation of TiCxOy was achieved via two routes. The uniformly coated pyrolitic carbon on fine titania particles formed the first TiCxOy phase at 1000°C. The additional TiCxOy formed from Ti3O5 as temperature increased. The activation energy of the additional TiCxOy formation process was calculated to be 278.1 kJ/mole. The TiC synthesis from titania/carbon black mixture started with reduction of TiO2 to Ti2O3 via an unidentified phase (possibly one of the Magneli phases). Then Ti3O5 was further reduced to Ti2O3, followed by the formation of TiCxOy phase and its purification toward TiC. The activation energy for the formation of Ti2O3 (from Ti3O5) and TiCxOy (from Ti2O3) phase were calculated to be 415.6 and 264.3 kJ/mole, respectively.