Chapter 5. Effect of Process Variables on Formation of a TaC Second Phase in a Lithium Aluminosilicate Glass-Ceramic

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

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Villalobos, G. R. and Speyer, R. F. (1995) Effect of Process Variables on Formation of a TaC Second Phase in a Lithium Aluminosilicate Glass-Ceramic, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch5

Author Information

  1. School of Materials Science and Engineering Georgia Institute of Technology Atlanta, GA 30332-0245

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • commercialization;
  • resistance;
  • illustrated;
  • photomicrograph;
  • composition

Summary

Tantalum oxide was added to a Li2O.Al2O3.4SiO2 batch and melted to form a glass. This glass was ground and exposed to secondary heat treatment in flowing CO. Heat treatment at or above 1300°C caused the particles to fuse, and a TaC-rich shell formed around the agglomerate via reaction between Ta2O5 and CO. No TaC formed in the interior, implying a diffusion barrier to soluble CO in the glass. When carbon was added to the crushed glass, small individually TaC-coated agglomerates formed. The agglomerate size distribution was inversely related to the amount of carbon added since coherent TaC shells around fluid glass particles prohibited agglomeration.