6533b82cfe1ef96bd128f331

RESEARCH PRODUCT

Water vapor effect on high-temperature oxidation behavior of Fe3Al intermetallics

Pitor JuzonSebastian ChevalierJ. P. LarpinKazimierz Przybylski

subject

Thermogravimetric analysisMaterials scienceMetallurgyKineticsOxideAnalytical chemistryIntermetallicchemistry.chemical_compoundchemistryGeneral Materials ScienceSpallationLayer (electronics)Water vaporOxidation rate

description

Fe3Al intermetallics (Fe3Al, Fe3Al-Zr, Fe3Al-Zr,Mo and Fe3Al-Zr, Mo, Nb) were oxidized at 950 °C in dry and humid (11 vol% water) synthetic air. Thermogravimetric measurements showed that the oxidation rates of the tested intermetallics were lower in humid air than in dry air (especially for Fe3Al-Zr, Mo and Fe3Al-Zr, Mo, Nb). The addition of small amounts of Zr, Mo or Nb improved the kinetics compared with that of the undoped Fe3Al. Fe3Al showed massive spallation, whereas Fe3Al-Zr, Fe3Al-Zr, Mo and Fe3Al-Zr, Mo, Nb produced a flat, adherent oxide layer. The rapid transformation of transient alumina into alpha alumina may explain the decrease in the oxidation rate in humid air.

https://doi.org/10.1088/1468-6996/10/4/045006