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Добірка наукової літератури з теми "Durabilité du revêtement"
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Статті в журналах з теми "Durabilité du revêtement"
Kramar, Sabina, Mirka Trajanova, Matej Dolenec, Maja Gutman, Mojca Bedjanič, and Ana Mladenovič. "Heritage Stone 7. Pohorje Granodiorite – One of the Most Significant Slovenian Natural Stones." Geoscience Canada 43, no. 1 (March 14, 2016): 79. http://dx.doi.org/10.12789/geocanj.2015.42.077.
Повний текст джерелаGarcia-Talegon, Jacinta, Adolfo C. Iñigo, Santiago Vicente-Tavera, and Eloy Molina-Ballesteros. "Heritage Stone 5. Silicified Granites (Bleeding Stone and Ochre Granite) as Global Heritage Stone Resources from Ávila, Central Spain." Geoscience Canada 43, no. 1 (March 14, 2016): 53. http://dx.doi.org/10.12789/geocanj.2016.43.087.
Повний текст джерелаДисертації з теми "Durabilité du revêtement"
Pouteau, Bertrand. "Durabilité mécanique du collage blanc sur noir dans les chaussées." Nantes, 2004. http://www.theses.fr/2004NANT2138.
Повний текст джерелаFor the last ten years, two new composite pavement structures (whitetopping –i. E. Thin concrete slabs over existing rutted asphalt pavement– and Continuously Reinforced Concrete Pavement, CRCP, over asphalt sub-base) have raised a significant interest. Based on the association of a concrete layer bonded to an asphalt sub-base, they lead to a reduction of the layers thickness and cost. A long-lasting bond is essential. This work deals with the mechanical study of the bond fatigue lifespan. Firstly, the bibliographical analysis focuses on the way this bond is deteriorated in such structures submitted to traffic. Cracks induced by the restrained shrinkage of the concrete layer can initiate and propagate debonding. Secondly, a mechanical fatigue test simulates this way of deterioration in laboratory. Interface blasting leads to a more lasting bond. A mechanical analysis of the test is also proposed. Thirdly, a non destructive survey method of the bond quality, based on the use of mechanical wave propagation, is developed. Eventually, full scale experiments analysis provide two evolution of bond. The RN4 experiment aims to measure the growth of an initial fracture at the interface between the concrete layer and the asphalt sub-base under real traffic conditions. After 2 years of traffic, no propagation of the fracture is noticed. For the second full scale experiment, a pavement structure model, constituted of thin layers and wide opened cracks, the awaited way of deterioration (delamination initiated from the vertical crack) is observed after 1 million cycles applied by the accelerated pavement loading facility FABAC
Perthue, Anthony. "Vers une amélioration des performances et de la durabilité de cellules photovoltaïques organiques par l'application d'un film composite multifonctionnel." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2014. http://tel.archives-ouvertes.fr/tel-01069015.
Повний текст джерелаPigerre, Jacques. "Contribution au développement d'un dispositif utilisant les ultrasons pour qualifier la durabilité de systèmes de peintures sur support métallique : application aux tôles d'acier galvanisé prélaquées." Antilles-Guyane, 2002. http://www.theses.fr/2002AGUY0078.
Повний текст джерелаNumerous testing procedures have been developed in order to qualify adhesion of organic coatings used for protection of metallic surfaces against corrosion. This work deals with the development of a new test based on ultrasonic solicitation of samples of steel substrates coated with paint films which thickness are lying in a range of 20 to 40 um. The various steps of the design of the experimental equipment and the last improvements are described. The aims of the thesis are the characterisation of mechanical behaviour of the protective film under periodic solicitation in wet medium, the monitoring of the reliability of the manufacturer's process and to try to predict the durability of the manufactured products under tropical conditions. The various experiments point out that water takes an important part during the test. The experimental results collected on the various samples make evidence that mechanical properties depend on the water barrier effect and on the exposure time of the organic coating to the tropical conditions. It is finally demonstrated that the durability of the manufactured products can be related to morphological aspects of the damages types undergone by the samples during the test
Labbe, Fabien. "Carbones revêtus de dioxyde d’étain comme supports cathodiques plus durables dans les piles à combustible à membrane échangeuse de protons (PEMFCs)." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM006/document.
Повний текст джерелаThe proton exchange membrane fuel cell’s lifespan is insufficient because of the degradation of carbon used as cathodic catalyst supports. In order to reduce this degradation, a thin tin dioxide coating is synthesized on the surface of different carbonaceous materials (nanotubes, carbon blacks and aerogel). The aim is to combine the morphology and the electric conductivity of the carbon with the thermodynamic stability of the tin dioxide. Carbonaceous materials with different intrinsic properties are chosen for this study to test a wide range of textures and structures. Experimental studies were carried out in order to synthesize a thin, homogeneous and covering tin dioxide coating. The major influences of the texture and structure of carbonaceous materials but also the influence of the pH value on the quantity and quality of the coating are highlighted. It turns out that the mechanism of formation of tin dioxide depends on this pH value. Thanks to the improvement of the interactions between the carbon surface and the reactive species, it was possible, in some cases, to reduce drastically the quantity of precursor. Platinum nanoparticles deposition performed on various materials (raw or coated carbon aerogel) highlights a different platinum behavior. In fact, on the tin dioxide surface, nanoparticles tend to agglomerate together instead of making a homogeneous dispersion. Then, the initial performances and the durability of electrocatalysts tested with two accelerated stress tests (load protocol or start/stop protocol) are evaluated, spotlighting mitigate results
Bernard, Marine. "Durabilité tribologique de revêtements pour applications aéronautiques à haute température." Thesis, Ecully, Ecole centrale de Lyon, 2013. http://www.theses.fr/2013ECDL0006.
Повний текст джерелаIn aeronautics tribology, mechanical parts are required to operate with increasing temperature. The increased functioning temperature of the contacts prone to friction and wear (such as bearings and other structural parts) is a direct consequence of the increasing power of jet engines. In the case of ball bearings, the substrate materials as well as the coating durability are affected by temperature. There is then a pressing need to introduce new coatings demonstrating effective tribological behaviour at high temperature. A PhD research subject was defined in partnership with Airbus Aerospace and SKF Aerospace and conducted at LTDS. The main goal of this research is to study the durability of ball bearings functioning under extreme conditions in terms of temperature and sliding friction. First, SEM/EDX analyses were done on the silver coating deposited in the contact between the ball bearings rings, in order to acknowledge the actual bearings surface damage. Tribological testing of the silver coating was then performed in a standard cylinder-on-flat configuration in order to compare in situ and experimental damages. More than ten different coatings (both soft and hard coatings, with solid lubrication properties and/or wear resistance properties) were then tested in the same configuration and conditions as the silver coating. These tests allowed us to identify the best suitable coatings for the application. An original test rig was also designed in the lab, in order to better simulate the bearings functioning conditions. This tribometer (TRHT) makes it possible to perform tests in ring-on-flat configuration (close contact) and to simultaneously apply a normal force up to 50 kN and a reciprocating rotating motion. Using this tribometer, the final tests were conducted on the best candidates among the different coatings, individually at first to assess their tribological behavior, and then in a configuration as close to reality as possible, with a hard coating covered ring and a soft coating covered flat, the contact between the two being greased or varnished. Finally, several possible solutions were determined, for two different functioning temperatures:160°C (CuNiIn + varnish Everlub / WC-C) and 570°C (stellite + varnish Everlub / TiHfCN)
Heinrich, Lydia Alexandra. "Biosourced Coating Systems for Metallic Substrates." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1004.
Повний текст джерелаMoving away from petroleum and towards biobased materials not only leads to greater sustainability and lower dependence on diminishing fossil resources, but can also catalyse the discovery of new properties. Aliphatic polyesters based on renewable resources have already started to replace traditional products. Within the Sorago project, a fully biobased resin for interior coil coatings has recently been proposed on the market (Estetic® Bio Air, Arcelor Mittal). In order to extend the possible use of the biobased product to exterior applications, an improvement of its resistance to humidity and UV radiation is crucial. This presents two challenges: The limited availability of monomers which provide rigidity in the resin structure and the relationship between the resin composition and its weatherability. Vanillin was chosen as a possible extension to the range of rigid, biobased monomers for polyesterification reactions. The transformation of its aldehyde and its reactivity was studied in terms of catalytic activation and through a series of copolymerisations which revealed the influence of the reaction conditions on the composition of the product. A structure-property relationship concerning the coating glass transition temperature and visco-elastic behaviour of the coating was furthermore established for a series of renewable monomers and contrasted with petroleum based equivalents. Series of prototypes with a wide variety of properties were then subjected to accelerated weathering tests. Their degradation was followed directly by gloss retention and different mechanisms were revealed using FTIR, µ-hardness and film thickness measurements. While the performance of the biobased coating was subpar, no evidence linking its degradation to the presence of renewable monomers was found, suggesting that the creation of a sufficiently durable and renewable exterior coating will be possible
Irigoyen, Maylis. "Durabilité des revêtements organiques anticorrosion : caractérisation de la dégradation." Toulon, 2002. http://www.theses.fr/2002TOUL0013.
Повний текст джерелаJebali, Syrine. "Vers un traitement superhydrophobe, durable et respectueux de l’environnement pour le textile : la solution de la polymérisation plasma." Thesis, Mulhouse, 2021. http://www.theses.fr/2021MULH4345.
Повний текст джерелаThe textile industry has been interested for long in water-repellency and self-cleaning properties. Deposition of fluorinated compounds with long carbon chains on the surface of textiles is currently the most efficient solution to reach such properties. Because of their harmful effects on health and environment, these chemicals have to be replaced in accordance with REACH specifications. During this PhD work, plasma polymerization process has been chosen as a good candidate to engineer durable, superhydrophobic and eco-friendly surface treatments for textiles. In this context, we successfully demonstrated the possibility to control temporally and spatially plasma polymerization kinetics of a model precursor widely studied at the IS2M, namely maleic anhydride, in an original one-meter long reactor. More than that, the possibility to control the chemical and morphological properties of plasma coatings was particularly addressed. Following a similar experimental methodology, the control of plasma polymerization of an organosilicon precursor, namely hexamethyldisiloxane (HMDSO), was investigated to get eco-friendly superhydrophobic coating. A focus was made on the understanding of thin film resistance to washing by characterizing coating cohesion and adhesion to the textile fiber. Finally, a second fluorine-free precursor was tested as an innovative alternative to HMDSO to engineer eco-friendly superhydrophobic coatings. By a fine tuning of temporal and spatial parameters of the plasma discharge, water-repellency performances of plasma polymer coatings and their durability could be significantly modified, highlighting the interesting approach developed during this PhD work
Cantot, Justine. "Contribution à l’étude de la tenue à l’eau des enrobés : Approche expérimentale multi échelle en laboratoire, d’un système modèle aux mélanges compactés." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0009.
Повний текст джерелаPerformance of asphalts pavement are lowered under mechanical and environmental loadings. Among influent factors, water appears to be one of the major element leading to deterioration of the material cohesion. Numerous test in the world are available to evaluate moisture damage in laboratory. However, most of them show poor correlation with field performances. A fundamental understanding is still needed to predict and prevent its effects.Contrary to wetting, stripping is defined as the shrinkage of the bitumen on aggregate surface. It could be one of the road pavement materials moisture damage mechanisms in presence of water. An experimental method was used to characterize the stripping kinetic using a model bitumen/aggregate interface. Additionally, standardized laboratory tests were carried out on loose and compacted mixes. Experimental procedures vary from one to another regarding conditioning process and mechanical loading types. Advantages and limits of these test methods are exposed. Different moisture damage mechanism have been identified using the acquired knowledge from the stripping evaluation on model system. This work also allow to evaluate the discriminating power of test methods. It allows to select the most relevant one able to evaluate several parameter influences on material durability in presence of water,in particular the chemical additivation of bitumen
Qhach, Thi Hai Yen. "Etude de la durabilité d'un primaire epoxy anticorrosion : rôle de l'interphase polymère/métal et conséquence sur l'adhérence." Phd thesis, Université du Sud Toulon Var, 2010. http://tel.archives-ouvertes.fr/tel-00647580.
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