The oxidation mechanism of θ-Al2O3 scales

B. A. Pint, J. R. Martin, L. W. Hobbs

Research output: Contribution to journalArticlepeer-review

221 Scopus citations

Abstract

A nearly single-phase θ-Al2O3 scale has been grown on two FeCrAl alloys, according to a time-temperature-transformation relationship for the formation of external alumina scales. SIMS sputter depth profiles of the 18O 16O distribution consistently indicate that θ-Al2O3 scales grow primarily by the outward transport of Al. This mechanism is consistent with the observed scale microstructure and is significantly different from tracer profiles for α-Al2O3 scales.

Original languageEnglish
Pages (from-to)99-107
Number of pages9
JournalSolid State Ionics
Volume78
Issue number1-2
DOIs
StatePublished - May 1995
Externally publishedYes

Funding

The authors are very grateful to J. Doychak at NASA Lewis, W. Lipscomb at Into and B. Jonsson at Kanthal for providing materials. Among our colleagues at MIT, thanks goes to J. Adario for his assistancew ith the GAXRD measurements,a nd to G. Arndt and R. Perilli for assistancew ith the oxidation equipment and tracer experiments.T he Electric Power Research Institute provided financial support for this research under contract #RP242644. The ASE Facility and SIMS are supportedb y NSF grant #DMR90-22933. BAP and LWH dedicatet his paper to our friend and co-author John R. Martin, whose untimely death on August 15, 1994 cut short the productive career of a talented scientist.

Keywords

  • O/SIMS
  • Oxide scales
  • Phase transformation

Fingerprint

Dive into the research topics of 'The oxidation mechanism of θ-Al2O3 scales'. Together they form a unique fingerprint.

Cite this