Effect of Pre-Oxidation on a Ti PVD Coated Ferritic Steel Substrate during High-Temperature Aging
Article dans une revue avec comité de lecture
A PVD coating is often applied on the surface of metallic alloys to improve their high-temperature resistance. In the present work, a thin titanium layer (1.2 µm) was deposited by PVD on the surface of a stainless steel substrate before high-temperature exposure (800 °C in ambient air). The underlying idea is that metallic Ti converts into Ti oxide (TiO2) during high-temperature aging at 800 °C, thereby slowing down the substrate oxidation. The stability of the coating with and without substrate pre-oxidation was investigated. Morphological, structural, and chemical characterizations were performed and completed by simulation of the film growth and measurement of the mechanical state of the film and the substrate. In the case of the sample that was not pre-oxidized, the oxidation of the steel was slowed down by the TiO2 scale but spallation was observed. On the other hand, when the steel was pre-oxidized, TiO2 provided more significant protection against high-temperature oxidation, and spalling or cracking did not occur. A combination of different kinds of stress could explain the two different behaviors, namely, the mechanical state of the film and the substrate before oxidation, the growing stress, and the thermal stress occurring during cooling down.
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureARDIGO-BESNARD, Maria-Rosa; BESNARD, Aurélien; MOSER, Mathias; BUSSIÈRE, Florian (MDPI AG, 2021)Spark plasma sintering technique is used for the fabrication of dense materials with a fine-grained microstructure. In this process, a powder is placed into a graphite mold and a uniaxial pressure is applied by two graphite ...
Effect of the microstructure on the tribological properties of HIPed and PTA-welded Fe-based hardfacing alloy Article dans une revue avec comité de lectureARDIGO-BESNARD, Maria-Rosa; TELLIER, Arnold; BESNARD, Aurélien; CHATEAU-CORNU, Jean-Philippe (Elsevier BV, 2021)his work focuses on the comparison of the tribological properties of Norem02, a Fe-based hardfacing elaborated by hot isostatic pressing (HIP), a pressure-assisted sintering technique and by plasma transferred arc welding ...
Comparison of thermal diffusion and interfacial reactions for bulk and sputtered titanium on 316L stainless steel Article dans une revue avec comité de lectureAUGER, Jean-Marc; COTTON, Dominique; NOUVEAU, Corinne; BESNARD, Aurélien; BERNARD, Frédéric; ARDIGO-BESNARD, Maria-Rosa; MONCHOUX, Jean-Philippe; COURS, R.; MARCELOT, Cécile (Elsevier BV, 2023-09-15)As a first step to devise a hybrid process for the production of TiC wear coatings on 316L, consisting of magnetron sputtering followed by titanium carburization, interfacial reactivity between stainless steel and titanium ...
Curvature radius measurement by optical profiler and determination of the residual stress in thin films Article dans une revue avec comité de lectureThe Stoney formula, based on the measurement of the substrate curvature, is often used for the determination of the thin films' residual stress. In this study, titanium nitride coatings were deposited by DC reactive magnetron ...
Article dans une revue avec comité de lectureThin films’ residual stress is often determined by the Stoney formula, using the measurements of the substrate curvature, even if the required hypotheses are not completely respected. In this study, a 2.2 μm titanium nitride ...