Chapter 11. Directed Nitridation of Liquid Aluminum Alloy: Growth Process and Modeling

  1. John B. Wachtman Jr.
  1. Y. Kagawa1,
  2. S. C. Khatri2 and
  3. M. J. Koczak2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314234.ch11

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10

How to Cite

Kagawa, Y., Khatri, S. C. and Koczak, M. J. (1993) Directed Nitridation of Liquid Aluminum Alloy: Growth Process and Modeling, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch11

Author Information

  1. 1

    Institute of Industrial Science, The University of Tokyo, 7–22–1, Roppongi, Minato-ku, Tokyo 106, Japan

  2. 2

    Department of Materials Engineering, Drexel University Philadelphia, PA, U.S.A.

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375273

Online ISBN: 9780470314234

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Keywords:

  • characteristic;
  • nitridation;
  • oxidation;
  • additive element;
  • liquid aluminum alloys

Summary

The nitridation of AI-Si-Mg alloys was carried out at temperatures ranging from 970 to 1373 K under high purity nitrogen gas atmosphere. The nitridation process is divided into three characteristic stages. Stage I corresponds to formation of a porous AIN layer above the liquid aluminum alloy. After stage I, bulk AINIAI-Si alloy composite forms and the nitridation rate shows the maximum value. The nitridation rate at stage II is constant. During stage III, the nitridation rate constantly decreases. The decreased nitridation rates are due to increased melt viscosity, higher diffusion distances for aluminum and depletion of aluminum alloy reservoir. In this paper, experimental evidence of the growth process and a preliminary analysis are presented.