TITLE:
Oxidation Behavior of Nanostructured TiAlN and AlCrN Thin Coatings on ASTM-SA213-T-22 Boiler Steel
AUTHORS:
Vikas Chawla, Amita Chawla, Buta Singh Sidhu, S. Prakash, D. Puri
KEYWORDS:
Nanostructured coating, High temperature oxidation, Oxide Scale, Physical vapourdeposition, Scale morphology
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.11,
November
20,
2010
ABSTRACT: Metals and alloys gets oxidized when exposed to elevated temperatures in air or highly oxidizing
environments, such as combustion gas with excess of air or oxygen. They often rely on the
oxidation reaction to develop a protective oxide scale to resist corrosion attack. In the present
study, nanostructured TiAlN and AlCrN thin films were deposited by physical vapour deposition
process on T-22 boiler steel (ASTM-SA213-T-22). Cyclic oxidation studies in air were conducted
at 900°C temperature in the laboratory using silicon carbide furnace. The weight gain was
measured after each cycle and visually examined the surface morphology of the oxidized samples
was studied using FE-SEM with EDAX attachment and XRD analysis. The results obtained
showed the better performance of AlCrN coated T-22 boiler steels then the TiAlN coated and
uncoated T-22 boiler steel.