Chapter 11. Oxidation and Transport Phenomena in the Reaction-Bonded Aluminum Oxide (Rbao) Process
- Todd Jessen,
- Ersan Ustundag
Published Online: 28 MAR 2008
DOI: 10.1002/9780470294635.ch11
Copyright © 2000 The American Ceramic Society
Book Title
24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4
Additional Information
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
Publication History
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 2000
Book Series:
ISBN Information
Print ISBN: 9780470375693
Online ISBN: 9780470294635
- Summary
- Chapter
- References
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.