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Oxidation behaviors of porous Haynes 214 alloy at high temperatures

Journal Article


Abstract


  • The oxidation behaviors of porous Haynes 214 alloy at temperatures from 850 to 1000 °C were investigated. The porous alloys before and after the oxidation were examined by optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) analyses, and X-ray photoelectron spectroscopy (XPS). The oxidation kinetics of the porous alloy approximately follows a parabolic rate law and exhibits two stages controlled by different oxidation courses. Complex oxide scales composed of Cr2O3, NiCr2O4 and Al2O3 are formed on the oxidized porous alloys, and the formation of Cr2O3 on its outer layer is promoted with the oxidation proceeding. The rough surface as well as the micropores in the microstructures of the porous alloy caused by the manufacturing process provides fast diffusion paths for oxygen so as to affect the formation of the oxide layers. Both the maximum pore size and the permeability of the porous alloys decrease with the increase of oxidation temperature and exposure time, which may limit its applications.

UOW Authors


  •   Wang, Yan (external author)
  •   Liu, Yong (external author)
  •   Tang, Hui-Ping (external author)
  •   Li, Weijie

Publication Date


  • 2015

Citation


  • Wang, Y., Liu, Y., Tang, H. & Li, W. (2015). Oxidation behaviors of porous Haynes 214 alloy at high temperatures. Materials Characterization, 107 283-292.

Scopus Eid


  • 2-s2.0-84939445137

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4452

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 283

End Page


  • 292

Volume


  • 107

Place Of Publication


  • United States

Abstract


  • The oxidation behaviors of porous Haynes 214 alloy at temperatures from 850 to 1000 °C were investigated. The porous alloys before and after the oxidation were examined by optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) analyses, and X-ray photoelectron spectroscopy (XPS). The oxidation kinetics of the porous alloy approximately follows a parabolic rate law and exhibits two stages controlled by different oxidation courses. Complex oxide scales composed of Cr2O3, NiCr2O4 and Al2O3 are formed on the oxidized porous alloys, and the formation of Cr2O3 on its outer layer is promoted with the oxidation proceeding. The rough surface as well as the micropores in the microstructures of the porous alloy caused by the manufacturing process provides fast diffusion paths for oxygen so as to affect the formation of the oxide layers. Both the maximum pore size and the permeability of the porous alloys decrease with the increase of oxidation temperature and exposure time, which may limit its applications.

UOW Authors


  •   Wang, Yan (external author)
  •   Liu, Yong (external author)
  •   Tang, Hui-Ping (external author)
  •   Li, Weijie

Publication Date


  • 2015

Citation


  • Wang, Y., Liu, Y., Tang, H. & Li, W. (2015). Oxidation behaviors of porous Haynes 214 alloy at high temperatures. Materials Characterization, 107 283-292.

Scopus Eid


  • 2-s2.0-84939445137

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4452

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 283

End Page


  • 292

Volume


  • 107

Place Of Publication


  • United States