A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation

A. Zakeri, E. Bahmani, A. Sabour Rouh Aghdam, B. Saeedi, Mingwen Bai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The present investigation is focusing on the high-temperature oxidation behavior of conventional and nano-CeO 2 modified MCrAlY alloys, in the form of powders and coatings. Emphasis is placed upon the influence of MCrAlY alloy form on the oxidation performance. The NiCoCrAlY- CeO 2 nanocomposite powders were prepared by mechanical milling and were subsequently thermally sprayed by high velocity oxygen-fuel (HVOF) technique. Isothermal oxidation tests were carried out at 1000 °C for up to 100 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) experimental analyses with thermodynamic equilibrium calculations were used for analysis of the oxide scales. The results indicated that the effect of nano-CeO 2 addition on the oxidation properties was more pronounced in the form of coating. Moreover, the oxidation rate of the nano-CeO 2 modified coating was found to be 87% lower than that of conventional coating, which was suggested to be related to the incorporation of nano-sized CeO 2 dispersion into the Al 2O 3 scale. The different oxidation mechanisms were discussed.

Original languageEnglish
Article number155319
Pages (from-to)(In-Press)
JournalJournal of Alloys and Compounds
Volume835
Early online date30 Apr 2020
DOIs
Publication statusPublished - 15 Sep 2020
Externally publishedYes

Keywords

  • MCrAlY
  • NiCoCrAlY
  • Nanocomposite
  • HVOF
  • Mechanical milling
  • High-temperature oxidation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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