Chapter 11. Oxidation and Transport Phenomena in the Reaction-Bonded Aluminum Oxide (Rbao) Process

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Ender Suvacr,
  2. George Simkovich and
  3. Gary L. Messing

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch11

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

How to Cite

Suvacr, E., Simkovich, G. and Messing, G. L. (2008) Oxidation and Transport Phenomena in the Reaction-Bonded Aluminum Oxide (Rbao) Process, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch11

Author Information

  1. Department of Materials Science and Engineering and Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 USA

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

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Keywords:

  • alpha alumina phase;
  • homogeneous oxidation;
  • reaction based processes;
  • aluminum;
  • RBAO process

Summary

The RBAO process involves compact oxidation, alpha alumina phase transformation and densification. Homogeneous compact oxidation is critical for densification and is controlled by heat transfer. Our studies show the process is controlled by convective heat transfer. The estimated effective thermal conductivity and heat transfer coefficient of 60% dense RBAO compact containing 55 vol% α-Al2O3 and 45 vol% Al are 0.65 W/m°K and 11.2 W/m2°K, respectively. Low heat transfer from the surface results in too rapid oxidation and the core-shell oxidation of the compact. Based on experiments and process modeling, we show how to obtain homogeneous oxidation of RBAO compacts.