Remaining Fatigue Life Assessment of Plasma Sprayed Thermal Barrier Coatings |
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Authors: | Philippe Robin François Gitzhofer Pierre Fauchais Maher Boulos |
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Affiliation: | 1.Centro de Nanociencias y Nanotecnología (CNyN),Universidad Nacional Autónoma de México,Ensenada,Mexico;2.Centre de Recherche en Energie Plasma et Electrochimie (CREPE),Université de Sherbrooke,Sherbrooke,Canada;3.Sciences des Procédés Céramiques et Traitements de Surface (SPCTS),Université de Limoges,Limoges,France;4.Tekna Plasma Systems Inc.,Sherbrooke,Canada |
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Abstract: | Ceramic functional coatings are frequently applied to structural materials, covering a wide range of thermomechanical and electrochemical applications. The main limiting feature is their reliability when subjected to cyclic transient thermal stresses. The study described in this article is a continuation of earlier research study focused on acoustic emission (AE) monitoring of the thermomechanical aging effects in ceramic coatings. Here, emphasis is placed on the usefulness of combining AE short-term monitoring with finite element modeling (FEM) to predict the performance of such coatings when subjected to cyclic thermal loads. The FEM study presented in this article is based on a three-dimensional, time-dependent approach, of the stress fields that developed within the coatings during the post-deposition cooling step and the thermal cycling. Experiments were conducted using yttrium-stabilized zirconia (YSZ) and Alumina (Al2O3) ceramic coatings combined with a NiCr-based intermetallic bond coat. |
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