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Artykuły w czasopismach na temat "Nitrures de vanadium"
Villarreal-López, Jesús David, William Arnulfo Aperador-Chaparro i Jairo Rafael Cortes-Lizarazo. "Análisis del Mecanizado en herramientas de acero rápido recubiertas con nitruro de vanadio". Respuestas 21, nr 2 (1.07.2016): 103. http://dx.doi.org/10.22463/0122820x.784.
Pełny tekst źródłaReal, C., M. A. Roldán, M. D. Alcalá i A. Ortega. "Síntesis y caracterización del nitruro ternario de titanio y vanadio (TixV1-xN)". Boletín de la Sociedad Española de Cerámica y Vidrio 50, nr 1 (28.02.2011): 31–40. http://dx.doi.org/10.3989/cyv.052011.
Pełny tekst źródłaGonzález Hernandez, Rafael Julián, Jairo Arbey Rodríguez Mártinez i William Rafael López Pérez. "Estudios AB-INITIO de las propiedades estructurales y electrónicas del nitruro de vanadio". Ciencia e Ingeniería Neogranadina 17, nr 1 (1.06.2007): 23–33. http://dx.doi.org/10.18359/rcin.1082.
Pełny tekst źródłaNavarro-Devia, John H., Willian A. Aperador i Arnoldo Delgado. "Mecanizado de Acero AISI1020, Utilizando Buriles con Recubrimiento Monocapa de Nitruro de Vanadio". Información tecnológica 28, nr 1 (2017): 77–86. http://dx.doi.org/10.4067/s0718-07642017000100008.
Pełny tekst źródłaRozprawy doktorskie na temat "Nitrures de vanadium"
BEAUPREZ, ERIC. "Structure electronique des nitrures de titane et de vanadium sous-stoechimetriques". Paris 6, 1989. http://www.theses.fr/1989PA066031.
Pełny tekst źródłaBonnefond, Pierre. "Elaboration à basse température par MOCVD de revêtements de nitrures et carbonitrures de vanadium à partir du tetrakis (diethylamido) vanadium". Toulouse, INPT, 1997. http://www.theses.fr/1997INPT014G.
Pełny tekst źródłaLaurent, François. "Précurseurs organométalliques de nitrure et de carbure de titane et de vanadium". Toulouse 3, 1992. http://www.theses.fr/1992TOU30226.
Pełny tekst źródłaAcevedo, Reyes Daniel. "Evolution de l'état de précipitation au cours de l'austénitisation d'aciers microalliés au vanadium et au niobium". Lyon, INSA, 2007. http://theses.insa-lyon.fr/publication/2007ISAL0008/these.pdf.
Pełny tekst źródłaGrain size control during heat treatments in austenite can be ensured by vanadium and niobium carbonitrides. However, the evolution of the precipitation state must be known to optimise the austenisation treatment, and no quantitative characterisation of this kind is available nowadays. This study deals with the dissolution kinetics of vanadium and niobium carbonitrides in austenite, for two high purity model alloys FeCV and FeCVNb, and a commercial alloy designed for springs fabrication. The characterisation combines several experimental techniques : structure and chemical composition of precipitates are established by transmission electronic microscopy and related techniques (EDS analysis, HAADF), particle size distribution is measured by means of scanning electronic microscopy (using a STEM detector), and volume fraction of precipitates is estimated by dosing the precipitated phases after an electrolytic dissolution of the matrix. In order to predict the evolution of the precipitation state during an austenitisation treatment, a precipitation-dissolution model has been developed. The modelling approach used in this work allows the description of (i) a non stoichiometric binary precipitate, the coexistence of two independent binary precipitates, (iii) the evolution of a single family of homogeneous ternary precipitates with varying chemical composition (VxNb1-xC). These different approaches were calibrated and validated on model alloys, then applied to the industrial alloy
Acevedo, Reyes Daniel Epicier Thierry Perez Michel. "Evolution de l'état de précipitation au cours de l'austénitisation d'aciers microalliés au vanadium et au niobium". Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=acevedo_reyes.
Pełny tekst źródłaMorel, Alban. "Matériaux nanocomposite pour le stockage de l'énergies". Nantes, 2015. https://archive.bu.univ-nantes.fr/pollux/show/show?id=98e08281-f7e6-4d77-bbab-26384f79814f.
Pełny tekst źródłaThis thesis is specifically aimed at studying the feasibility and the performance of a hybrid device VN/KOHaq/Co3O4 so as to enhance the volumetric energy and power density of electrochemical capacitor (ECs). The two electrode materials present a density 8 times larger than the usual capacitive carbon material, used in ECs, as well as a larger capacity per mass unit due to their pseudocapacitive (VN) and faradaic (C0304) properties. Considering that high power density and long cycle life make ECs attractive for some applications, it is important to ensure that each material fulfills these specifications. As a first step, the feasibility of establishing a molecular bridge between Co3O4 nanoparticles and carbon fibers and its effect on the electrochemical performance of the nanocomposite material were investigated. In a second phase, this films of vanadium nitride were prepared in order to determine the suitable conditions required to ensure a long cycle life of the electrode. Moreover, the charge storage processes of these VN electrodes were investigated in different electrolytes. Finally, a VN/KOHaq lCo3O4 microdevice was realized and electrochemically characterized
García, Wong Alexis. "Oxidation of vanadium nitrides thin films : a novel method to form efficient thermochromic VO₂". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0098.
Pełny tekst źródłaIn this thesis, we study the formation of vanadium dioxide (VO₂) from a two-step procedure. We demonstrate for the first time that high-quality thermochromic VO₂ can be obtained from the air oxidation of sputter-deposited VN and V₂N polycrystalline films. Depending on the annealing conditions (duration and temperature) VO₂ and V₂O₅ are the two principal phases formed during the oxidation process of the nitride films. The first oxide obtained is VO₂(M), which coexists with the precursor for a prolonged period at 450°C or suddenly disappeared at 525 and 550°C. For optimized durations at each temperature VO₂(M) is the predominant phase. For higher durations, the VO₂ phase is oxidized into V₂O₅. The thermochromic performance of the vanadium oxide films is strongly influenced by the oxidation duration. TEM analysis indicates that both VN and V₂N precursors follow different oxidation kinetics. Concerning the VN oxidation, there is an abrupt interface between the polycrystalline VN films and the formed VO₂. On the other hand, EELS results for the V₂N oxidation evidence a formation of a VN layer at the interface between the remaining V₂N layer and the growing VO₂ one. Besides, the influence of the V₂N thickness on the optical modulation properties of the formed VO₂(M) is studied. The oxidation of 100 nm-thick V₂N films on Si substrate yields a negative emissivity switch (Δε). On the contrary, the annealing of 445 nm V₂N samples produces a positive value for Δε. These findings indicate the possibility to control the sign of the optical modulation of the formed VO₂ depending on the initial thickness of the V₂N precursor. Furthermore, we investigate the oxidation of epitaxial VN thin films, which follow a different path than polycrystalline VN films, caused by the absence of grain boundaries in the epitaxial layers. This process depicts the epitaxial growth of a VO₂(B) layer on the remaining VN, as shown by TEM results. Finally, we apply a simple criterion to transpose the deposition conditions between the two sputtering machines used in the thesis based on the thermochromic performance
Dinh, Khac Huy. "Fabrication of solid state Micro-Supercapacitors based on transition metal nitride thin films for powering the Internet of Things". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN021.pdf.
Pełny tekst źródłaThe rapid growth of Internet of Things (IoT) applications has led in an increased demand for energy storage devices. Micro-supercapacitors (MSCs) have emerged as promising candidates for high-speed applications due to their high-rate capabilities, long cycle life and environmental friendliness. However, the main challenge to be addressed for the widespread industrial use of MSCs is their relatively low energy density. To address this issue, various solutions have been explored to increase the capacitance or the cell voltage by playing with the electrolyte used, electrode materials and device topologies to achieve high-performance MSCs. This work focuses on the investigation of thin film electrode materials prepared by magnetron sputtering deposition. In particular, vanadium tungsten nitride (VWN) and ruthenium nitride (RuN) have been investigated as efficient pseudocapacitive electrode materials. This work was carried out in the frame of the CAMISOL project selected by the Lille university through the PEARL program (Program for EArly-stage Researchers in Lille) cofunded by the European Commission, where the motivation was to fabricate solid-state VN (or VWN) // RuN asymmetric micro-supercapacitors (AMSC). VWN thin films were synthesized using co-sputtering and nanolaminate approaches and demonstrated excellent performance challenging the best multicatonic materials reported for MSCs. Advanced characterization mapping techniques were used to explore the correlation between the structural, electrical, mechanical, and electrochemical properties of the films. This approach offers new perspectives and provides a powerful characterization tool for the next generation of electrochemical materials fabricated by thin film deposition methods at Lille University.In the following part of the thesis, RuN films were investigated as efficient electrode materials, and solid-state VN // RuN AMSC was presented as a proof of concept. Sputtering parameters were carefully optimized to maximize the film porosity while maintaining high electrical conductivity. Various advanced techniques were employed to reveal the complexity of the structure and charge storage mechanism of RuN films. Taking advantage from the complementary working window of VN and RuN films in a 1M KOH aqueous electrolyte, the cell voltage of the VN // RuN AMSC device was significantly increased, reaching up to 1.15 V. As a result, the VN // RuN AMSC exhibited one of the highest areal energy densities reported so far for AMSCs based on transition metal nitride thin films. Finally, the study of the use of solid-state electrolyte, PVA/KOH hydrogel electrolyte and ionic liquids in the fabrication of all-solid-state AMSCs was presented
Robert, Kévin. "Vers la fabrication collective de micro-supercondensateurs à électrodes interdigitées à base de nitrure de vanadium déposé en technologie couche mince". Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I082/document.
Pełny tekst źródłaThe mobile connected devices have a prominent place in our everyday life but energy autonomy is limited. Thus, the development of efficient and miniaturized energy storage devices is an expanding field. The performance of these systems depends on the used electrode materials and the electrolyte. This thesis is focused on the fabrication of micro-supercapacitors with interdigitated electrodes composed of sputtered vanadium nitride (VN) thin films. The modulation of the deposition parameters allows densifying the thin films in order to increase their electrical conductivity or, on the contrary, leads to the synthesis of porous thin films to increase the surface capacitance. X-ray absorption spectroscopy of VN thin films tested in aqueous KOH in operando configuration coupled with surfaces analyses (XPS/ ToF-SIMS) show that the high capacitance of the VN is due to the presence of thin layer of vanadium oxide at the VN surface. Micro-supercapacitors reporting state-of-art performance in interdigitated or face/face topologies were fabricated using optimized VN films: the film thickness was varied to increase the energy density. The Atomic Layer Deposition of VN layers was also achieved in the frame of this study in order to ensure the formation of thin layers on high specific surface area 3D substrates. Finally, different ionic liquids have been tested as electrolyte, the purpose being solid electrolyte formation based on ionogels technology
Cyr-Athis, Olivier. "Composés organométalliques précurseurs de carbure et de nitrure de vanadium par dépôt chimique en phase vapeur". Toulouse, INPT, 1994. http://www.theses.fr/1994INPT021G.
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