Chapter 3. Effects of Oxidation-Reduction Reactions in Magnesia-Graphite Compositions

  1. William Smothers
  1. Yu-Lian Lin and
  2. Charles E. Semler

Published Online: 28 MAR 2008

DOI: 10.1002/9780470320310.ch3

Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2

Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2

How to Cite

Lin, Y.-L. and Semler, C. E. (1986) Effects of Oxidation-Reduction Reactions in Magnesia-Graphite Compositions, in Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320310.ch3

Author Information

  1. Ohio State Univ. Dept. of Ceramic Eng. 2041 College Rd., Columbus, OH 43210

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780470374443

Online ISBN: 9780470320310

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Keywords:

  • oxidation-reduction reaction;
  • grading;
  • microstructure;
  • thermal shock resistance;
  • MgO zone

Summary

The microstructural effects associated with oxidation-reduction reaction in seawater magnesite-graphite compositions have been studied. Selected compositions of coarse, intermediate, and fine particle size grading were fired at 1600° and 1650°C with various hold times at temperature and controlled variation of the firing atmosphere. Evaluation of the fired samples included percent oxidation, weight loss, dense zone, and characterization of the MgO dense zone microstructure. The progressive sample bloating that was observed for various materials and firing conditions are illustrated. The mechanism(s) and rate of dense zone formation is discussed. The effect of particle size and atmosphere variation in controlling decarbonization is considered.