Study of the oxidation mechanism at high temperature of nanofiber textured AlTiCrN coatings produced by physical vapor deposition using high-resolution characterization techniques. (June 2022)

• Record Type: Journal Article
• Authors: Alhafian, M-R.; Chemin, J-B.; Valle, N.; El Adib, B.; Penoy, M.; Bourgeois, L.; Ghanbaja, J.; Barrirero, J.; Soldera, F.; Mücklich, F.; Choquet, P.
• Is Part Of: Corrosion science. Volume 201(2022)
• Publication Date: 2022-06
• Subjects: Hybrid HiPIMS Hybrid High-Power Impulse Magnetron Sputtering -- dcMS direct-current Magnetron Sputtering -- FE-SEM Field Emission Scanning Electron Microscopy -- EDS Energy Dispersive X-ray Spectroscopy -- TEM Transmission Electron Microscopy -- SAED Selected Area Electron Diffraction -- HRTEM High Resolution Transmission Electron Microscopy -- APT Atom Probe Tomography -- D-SIMS Dynamic Secondary Ion Mass Spectrometry; High-Power Impulse Magnetron Sputtering (HiPIMS) -- Aluminium-titanium-chromiumnitride (AlTiCrN) coatings -- Oxidation resistance -- Thermal stability -- Oxygen isotopic analysis; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110226
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: AlTiN coatings with a NaCl structure have onset point of oxidation around 850 °C. To withstand oxidation above 850 °C, we studied the influence of Cr addition on the structure, mechanical properties and oxidation resistance of different AlTiCrN coatings. The structural evolution during the annealing of the AlTiCrN coating was revealing that all coatings kept the NaCl structure up to 950 °C. The oxidized coatings shown that the addition of Cr promoted the formation of a TiO2 layer over a gradient CrAl2 O3 layer. This last layer is very rich in aluminum under the TiO2 layer and richer in chromium at the nitride-oxide interphase. Graphical Abstract: ga1 Highlights: Al0.45 Ti0.29 Cr0.26 N coating kept the single-phase cubic structure up to 950 °C. Cr content can stabilize the hardness and the elastic modulus independently of the Al/Ti ratio in the as-deposited coating. The addition of Cr to AlTiN coating promoted the formation of a TiO2 layer over a gradient (Crx Aly )2 O3 layer at 950 °C. The oxidation mechanism is controlled by the cationic diffusion of oxygen to the oxide-nitride coating interface and by the anionic grain-boundary diffusion of titanium at the external surface.