Oxidation mechanisms of lanthanum-alloyed Mo-Si-B

Sanjib Majumdar, Bronislava Gorr, Hans-Jürgen Christ, Daniel Schliephake, Martin Heilmaier

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32 Citations (Scopus)

Abstract

High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2at.% La was studied between 750 and 1400°C in static air. Isothermal thermogravimetric analysis for up to 72h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000°C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa2O3{dot operator}yMoO3), which reduces the evaporation of MoO3 below 1000°C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations.

Original languageEnglish
Pages (from-to)360-371
Number of pages12
JournalCorrosion Science
Volume88
DOIs
Publication statusPublished - 1 Nov 2014
Externally publishedYes

Keywords

  • A. Rare earth elements
  • B. SEM
  • B. TEM
  • C. High temperature corrosion
  • C. Oxidation

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