Oxidation and transport phenomena in the reaction-bonded aluminum oxide (RBAO) process

Ender Suvaci, George Simkovich, Gary Lynn Messing

Research output: Contribution to journalConference article

Abstract

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.

Original languageEnglish (US)
Pages (from-to)79-86
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume21
Issue number4
StatePublished - Jan 1 2000
Event24th Annual Conference on Composites, Advanced Ceramics, Materials,and Structures:B - Cocoa Beach, FL, USA
Duration: Jan 23 2000Jan 28 2000

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Aluminum Oxide
Aluminum
Oxidation
Oxides
Heat transfer
Densification
Heat transfer coefficients
Thermal conductivity
Alumina
Phase transitions
Experiments

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "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.",
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Oxidation and transport phenomena in the reaction-bonded aluminum oxide (RBAO) process. / Suvaci, Ender; Simkovich, George; Messing, Gary Lynn.

In: Ceramic Engineering and Science Proceedings, Vol. 21, No. 4, 01.01.2000, p. 79-86.

Research output: Contribution to journalConference article

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