Chapter 23. Effect of Co and C on the Formation of TaC in a Lithium Aluminosilicate Glass/Ceramic with Ta2O5 Additions

  1. John B. Wachtman Jr.
  1. G. R. Villalobos and
  2. R. F. Speyer

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch23

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Villalobos, G. R. and Speyer, R. F. (1996) Effect of Co and C on the Formation of TaC in a Lithium Aluminosilicate Glass/Ceramic with Ta2O5 Additions, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch23

Author Information

  1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • atmosphere;
  • thermodynamic;
  • oxidation;
  • crystalline;
  • diffusivity

Summary

A lithium aluminosilicate glass-ceramic having the 1:1:4 mole ratio corresponding to β-spodumene solid solution with 6 weight percent Ta2O5 was heat treated in an atmosphere controlled tube furnace at temperatures of 1100, 1300, and 1400°C. The atmospheres used were CO, argon, and a mixed schedule using both. Powdered batches with and without carbon black additions were investigated. Thermodynamic calculations, confirmed experimentally, indicate the favor ability of Ta2O5 reacting with either CO or carbon to form TaC above 1106°C. There was no evidence of Ta2O5 forming TaC in the sample interiors.