Добірка наукової літератури з теми "Revêtements protecteurs – Propriétés thermiques"
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Дисертації з теми "Revêtements protecteurs – Propriétés thermiques":
Irigoyen, Maylis. "Durabilité des revêtements organiques anticorrosion : caractérisation de la dégradation." Toulon, 2002. http://www.theses.fr/2002TOUL0013.
Faugeroux, Olivier. "Caractérisation thermophysique de revêtements de protection thermomécanique par méthode photothermique impulsionnelle." Perpignan, 2001. http://www.theses.fr/2001PERP0459.
Guinard, Caroline. "Influence des propriétés morphologiques et mécaniques des barrières thermiques sur la fissuration interfaciale induite par perçage laser impulsionnel." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM068/document.
Many aircraft engines parts such as combustion chambers are drilled with numerous cooling holes. These holes, generally performed by a high power laser machine can induce damages in the part materials. On thermal barrier coatings systems, cracking can lead to spalling of the coating occurs at the ceramic / bond-coat layer interface during laser drilling. This thesis presents elements of understanding of the interfacial crack formation end propagation phenomena. In this purpose, a specific protocol was used, consisting of interrupted drilling process. Moreover, in order to understand the influence of the bond coat and the ceramic / bond coat interface on cracking, a wide range of samples with specific morphological and mechanical properties were selected. With this in mind, the bond coat was modified by varying spraying parameters, spraying process and also by post treatments on the bond coat. The link between these interfaces and the associated damages due to laser drilling are presented through 2D and 3D observations, destructive and non-destructive, as well as the study of residual stress modification before and after laser drilling for several thermal barrier coatings systems. For further reducing the interfacial crack, several drilling strategies are considered through the laser peak power variation between the different laser pulses needed to drill through the multi-layer material. The results offer interesting perspectives for improving crack resistance of aeronautical engines parts
Boissonnet, Germain. "Factors influencing the thermal insulation potential of different thermal barrier coating systems." Thesis, La Rochelle, 2019. http://www.theses.fr/2019LAROS007.
In aeronautical gas turbine engines, the metallic materials employed in the hottest sections are subject to very harsh chemical environments at high pressures and temperatures. Therefore, thermal barrier coating systems (TBCs) are applied onto nickel-based superalloy substrates. These multi-layered systems (ceramic yttria-stabilized zirconia (YSZ) / MCrAl or NiPtAl bond coats / cooled substrate) lower the temperature at the components surface, which ensures an adequate thermomechanical behaviour and reduces the oxidation/corrosion rates. However, the increase of the turbine inlet temperature (increased engine performance) brings about new degradation phenomena (e.g. CMAS) and loss of efficiency of the current TBCs. Therefore, understanding the evolution of the insulation ability of TBCs in such harsh environments is key from both the scientific and technological perspectives to estimate the lifetime of these coatings, hence that of the engines. Based on current plasma-sprayed (PS) and electron-beam physical vapour deposited (EB-PVD) YSZ coatings, this thesis seeks to provide a better comprehension on the relationships between the intrinsic properties of the current TBCs and their thermal insulation capacity as a basis for the development of future coatings. Also, this work studies an alternative solution to create a TBC made of hollow alumina microspheres by the slurry route. We will show that the sintering of the YSZ, the evolution of crystal phases, the reactions between YSZ and CMAS and the growth of thermal oxides alter the thermal diffusivity to different extents. In contrast, the evolution of the thermal diffusivity with temperature is less marked with the slurry alumina coatings, which appear more stable when hybrid Ar/air annealing atmospheres are employed upon their synthesis
Thibault, Marc. "Élaboration et caractérisation de revêtements formés par hydrolyse et condensation d'alcoxysilanes sur tôles magnétiques à grains orientés et non orientés." Lille 1, 1995. http://www.theses.fr/1995LIL10110.
Ravaux, Alice. "Réalisation et étude de dépôts composites multi-échelle élaborés par projection plasma pour applications tribologiques à hautes températures." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0077/document.
Nowadays, tribology has a high energetic impact on economic and industrial areas. Thus, reducing wear and friction of mechanical parts has become a real stakes for various industries. This study is focused on the wear prevention of mechanical parts subjected to severe operating conditions like high temperatures.The realization of protective ceramic-metal coatings is thus particularly appropriated to improve corrosion resistance induced by the high temperatures, with a suitable alloy, and the wear resistance, thanks to the ceramics hardness. Furthermore, researches development in the nanoscale field have shown the interest of scale reduction on the improvement of coatings tribological properties. Thermal spraying is then the most appropriate process for the realization of such coatings.In this work, multi-components (ceramic-metal) and multi-scales (micrometric-nanometric) coatings are developed by plasma spraying in order to give an answer to the high temperature tribological resistance issue. Coatings are realized using a three-cathodes plasma gun (TriplexPro-200) which provides a more stable plasma jet and offers wide possibilities by an extended operating window. First, the special features of this kind of plasma gun will be studied in order to adjust the process to the complex realization of multi-scale coatings. An innovative approach using a hybrid spraying process was thus developed, combining conventional micrometric powder spraying and suspension of nanoscale powders spraying. In a second time, the steps leading to the production of such coatings will be detailed, and finally, their main properties and their tribological behavior will be studied
Saïdi, Salima. "Synthèse et formulation de résines fluorées : étude des propriétés antigraffiti." Nice, 2002. http://www.theses.fr/2002NICE5750.
Boudot, Aline. "Propriétés des revêtements de protection haute température pour pales de turbine haute pression." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT034G.
The aim of this work was the characterization of the vacuum plasma sprayed or electrodeposited NiCoCrA1YTa coating, used for protection of H. P. Turbine blade. First, both massive coatings were characterized in terms of physico-chemical and mechanical properties. The electrodeposited alloy shows a less homogenous distribution of β and γ phases and, in this coating, yttrium is segregated in the material as oxides and precipitates. These distinctive features induce mechanical spallation of the oxide scales and lower mechanical properties for the electrodeposited coating. Then, influence of protective coatings on nickel-base single crystal superalloy was characterized. Few differences were observed between the vacuum plasma sprayed coating and the electrodeposited one. The coating effect is mainly dependant on its ductile or brittle behaviour. If the mechanical solicitations of the substrate/coating system are applied in the brittle field of the coating, this one presents a detrimental effect. In the other case, a positiv effect of the coating is observed which comes from the protection of substrate against environmental degradation
Gomart, Hector. "Modélisation des propriétés thermo-radiatives de revêtements à haute efficacité énergétique." Orléans, 2008. http://www.theses.fr/2008ORLE2050.
Veys, Delphine. "Évolution des propriétés physico-chimiques de surface des matériaux quasicristallins lors de sollicitations électrochimiques." Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL076N.
The main goal of this study is to understand how the surface properties of quasicrystalline and approximant alloys are modified when submitted to various kinds of electrochemical stress. The alloys are Al-based complex intermetallic phases of the AI-(Cu)-Fe-Cr system, submitted to either corrosion test in aggressive media or simply to oxidation and ageing in ambient conditions. Ln a first part, bulk alloys of the AI-(Cu)-Fe-Cr system were synthesized and their atomic structure was characterised. Then, the corrosion behaviour of these alloys was investigated with a view to identify the role of the chemical composition and of the crystallographic structure on their ability to resist corrosion attack in a medium containing citric acid and chloride anions. This work bas allowed us to âetermine the corrosion mechanisms and to identify some alloy compositions which demonstrate high-resistance against corrosion. The last part focusses on the evolution of surface structure and chemistry as a function of electrochemical stress. The topography, composition and structure of corroded samples were analysed. Ln addition, for AICrFe samples, we have highlighted an ageing phenomenon of the surfaces in ambient conditions. We have proposed a model describing the surface of these materials as a stacking of several layers with different chemistry. The surface ageing is modelled and related to the observed modifications of the chemical reactivity