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Добірка наукової літератури з теми "Céramiques projetées plasma"
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Дисертації з теми "Céramiques projetées plasma"
Lestrade, Laurent. "Etude de la fusion superficielle au four solaire de barrières thermiques ZrO2-Y2O3 projetées par plasma." Perpignan, 1996. http://www.theses.fr/1996PERP0241.
Повний текст джерелаLongchamp, Vincent. "Modélisation du comportement de céramiques projetées plasma sous choc par simulation discrète à l'échelle de la microstructure." Electronic Thesis or Diss., Paris, HESAM, 2024. http://www.theses.fr/2024HESAE018.
Повний текст джерелаCeramic coatings obtained by plasma spraying (APS) have a porous, micro-cracked microstructure that has a significant effect on mechanical properties when subjected to micro-debris impact or laser shock.The microstructure attenuates compression waves, which can be useful for protective applications.Consequently, characterization of the microstructure-properties link, under dynamic loading, is necessary to exploit the potential of these materials, but understanding of the mechanisms involved is still limited.This thesis focuses on the possibilities offered by the discrete element method (DEM) for modelling heterogeneous materials such as plasma-sprayed ceramics at the microstructure scale. A strategy for creating 3D numerical domains representing the microstructure is proposed. It is based on the analysis of volume images obtained by FIB-SEM: porosity is detected and then processed according to its scale, in order to be reproduced digitally. Simulations are carried out on the models to study the effect of the microstructure on the propagation of compression waves, to obtain macroscopic behavior laws and to study the induced damage
Ranchy, Éric. "Etude des modes de transfert thermique dans les dépôts céramiques projetés par plasma." Paris 10, 1995. http://www.theses.fr/1995PA100105.
Повний текст джерелаLeclercq, Gaëlle. "Etude du comportement thermomécanique de la YSZ projetée plasma sous vieillissement hydrique." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0002/document.
Повний текст джерелаYttria Stabilized Zirconia (YSZ) coatings, deposited by plasma sprayed process, are refractory ceramics mostly used as the Thermal Barrier Coating (TBC) applications. The low YSZ thermal conductivity associated to the good mechanical resistance ensures a high performances and efficiencies of these TBC. The structure and the complex microstructure are responsible for the mechanical properties and must be controlled. Like brittle ceramic materials, the YSZ is affected by degradation at low temperature due to water vapor. Material ageing results from the progressive degradation of the mechanical properties (such as fracture strength and Young’s modulus), which seem to decrease in time and accelerate depending on temperature. In this study, the mechanical properties have been evaluated by means of three-point bending tests at room temperature. The observations of the structure and the microstructure are respectively investigated by X-ray diffraction and SEM-technique with material ageing. An analytical model is suggested in order to predict the evolution of the properties under humidity atmosphere
Saif, Gausseem. "Mise au point et caractérisation de couches intermédiaires permettant l'accrochage entre un alliage métallique et une céramique projetée plasma." Ecully, Ecole centrale de Lyon, 1991. http://bibli.ec-lyon.fr/exl-doc/TH_T1496_gsaif.pdf.
Повний текст джерелаLukat, Sébastien. "Optimisation de l'adhérence de revêtements d'alumine projetés sur matériaux composites à matrice céramique : application à l'instrumentation extensométrique." Besançon, 2007. http://www.theses.fr/2007BESA2018.
Повний текст джерелаThis study deals with a self-healing multilayer matrix and carbon or silicon carbide fiber-reinforced ceramic matrix composites. Many papers have shown that the adherence of sprayed alumina coatings to such substrates is quite poor. According to a literature survey, two ways were identified to improve the coating bond : enhancing the substrate surface properties, by means of a cumulative laser treatment, and depositing a silicon bond coat, i. E. Implementing a multilayer coating. First the surface modifications of CMC induced by a cumulative laser treatment were studied. Some morphological, elementary and structural analyses of the treated surfaces revealed a microcone morphology and a superficial decarburization, due to laser ablation. The relationships between the surface properties and the adherence of sprayed alumina coatings on CMC were then studied. In the case of alumina deposit after laser treatment, a rather high level of adherence compared to untreated surfaces has been noticed. This might be due to the surface morphology : indeed microcones could favor the mechanical anchorage of the sprayed particles on the substrate. In the case of silicon/alumina multilayer coatings, it was shown that the adherence of silicon coatings prepared by vacuum plasma spraying was higher than that of the coatings prepared by atmospherical plasma spraying. In the former, physico-chemical binds are supposed to develop. Eventually, these results were applied to strain measurement. The feasibility of integrating a free filament strain gage in a sprayed alumina coating on CMC was demonstrated by the preparation of test specimens
Amsellem, Olivier. "Simulations 2D et 3D de microstructure d'alumine projetée plasma pour l'étude de ses propriétés mécaniques et électriques." Phd thesis, École Nationale Supérieure des Mines de Paris, 2008. http://tel.archives-ouvertes.fr/tel-00331802.
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