Improving the high-temperature oxidation resistance of a β-γ TiAl alloy by a Cr2AlC coating

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Q. M. Wang - , Brandenburg University of Technology, CAS - Institute of Metal Research, Pusan National University (Author)
  • R. Mykhaylonka - , Brandenburg University of Technology (Author)
  • A. Flores Renteria - , Brandenburg University of Technology (Author)
  • J. L. Zhang - , Brandenburg University of Technology (Author)
  • C. Leyens - , Institute of Materials Science, Chair of Materials Technology, Brandenburg University of Technology, TUD Dresden University of Technology (Author)
  • K. H. Kim - , Pusan National University (Author)

Abstract

A Cr2AlC coating was deposited on a β-γ TiAl alloy. Isothermal oxidation tests at 700°C and 800°C, and thermocyclic oxidation at 800°C were performed in air. The results indicated that serious oxidation occurred on the bare alloy. Thick non-protective oxide scales consisting of mixed TiO2+α-Al2O3 layers formed on the alloy surface. The coated specimens exhibited much better oxidation behaviour by forming an Al-rich oxide scale on the coating surface during the initial stages of oxidation. This scale acts as diffusion barrier by effectively blocking the ingress of oxygen, and effectively protects the coated alloys from further oxidation.

Details

Original languageEnglish
Pages (from-to)3793-3802
Number of pages10
JournalCorrosion Science
Volume52
Issue number11
Publication statusPublished - Nov 2010
Peer-reviewedYes

Keywords

ASJC Scopus subject areas

Keywords

  • A. Ceramic, A. Intermetallics, A. Sputtered films, B. SEM, B. XRD, C. Oxidation