Volume 11, Issue 40 (8-2021)
مهندسی خوردگی 2021, 11(40): 65-76 |
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The Early Oxidation of Vacuum Heat
Treated Nanostructured NiCoCrAlY
Coatings. مهندسی خوردگی 2021; 11 (40) :65-76
URL: http://journal.ica.ir/article-1-159-en.html
URL: http://journal.ica.ir/article-1-159-en.html
Abstract: (284 Views)
Conventional and vacuum heat treated nanostructured NiCrAlY coatings were applied using the high-velocity
oxy-fuel (HVOF) process. The microstructural examinations of the as-received and nanostructured powders as
well as their developed coatings were then analyzed using field emission scanning electron microscope (FESEM)
equipped with energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM) and X-ray
photoelectron spectroscopy (XPS) analyses. For investigating oxidation behavior, the coated specimens were
subjected to isothermal oxidation testing at 1050 ºC up to 5 h under air atmosphere. The results indicated that the
nanostructured NiCrAlY coating has a lower oxide growth rate compared with the conventional coating due to
the controlling the diffusion of Al-ions by the higher volume fraction of grain boundaries in the coating structure.
oxy-fuel (HVOF) process. The microstructural examinations of the as-received and nanostructured powders as
well as their developed coatings were then analyzed using field emission scanning electron microscope (FESEM)
equipped with energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM) and X-ray
photoelectron spectroscopy (XPS) analyses. For investigating oxidation behavior, the coated specimens were
subjected to isothermal oxidation testing at 1050 ºC up to 5 h under air atmosphere. The results indicated that the
nanostructured NiCrAlY coating has a lower oxide growth rate compared with the conventional coating due to
the controlling the diffusion of Al-ions by the higher volume fraction of grain boundaries in the coating structure.
Type of Study: Research |
Subject:
General
Received: 2023/01/28 | Accepted: 2023/01/30 | Published: 2023/01/30
Received: 2023/01/28 | Accepted: 2023/01/30 | Published: 2023/01/30
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