Reaction-bonded aluminium oxide (RBAO) process: II, the solid-state oxidation of RBAO compacts

Ender Suvaci, George Simkovich, Gary L. Messing

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The oxidation kinetics and the fraction of aluminum that is oxidized via solid-gas reaction in reaction-bonded aluminum oxide (RBAO) compacts are shown to be strongly dependent on the oxidation temperature and the characteristics (size and green density) of the RBAO compact. Based on the Biot number, the oxidation process of RBAO compacts is controlled by convective heat transfer. Low heat transfer from the surface of the compact results in too-rapid oxidation, thermal gradients, and core-shell oxidation of the compacts. Uniform oxidation of RBAO compacts is possible by oxidizing at low temperatures (400 °-470 °C), where slow surface reaction of the aluminum particles controls the oxidation of the compact. A grain model is presented to cover both linear and nonlinear oxidation regimes during the oxidation of a RBAO compact, and this model predicts the experimental results when surface reaction of the aluminum particles is the rate-controlling mechanism and oxidation of the compact occurs uniformly.

Original languageEnglish (US)
Pages (from-to)1845-1852
Number of pages8
JournalUnknown Journal
Volume83
Issue number8
DOIs
StatePublished - Aug 2000

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Reaction-bonded aluminium oxide (RBAO) process: II, the solid-state oxidation of RBAO compacts'. Together they form a unique fingerprint.

  • Cite this