Готові списки джерел за темами / Laser hybrid deposition

Добірка наукової літератури з теми "Laser hybrid deposition"

Автор: Grafiati
Опубліковано: 14 жовтня 2022

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  3. Частини книг
  4. Тези доповідей конференцій
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Статті в журналах з теми "Laser hybrid deposition":

1

Mikšovský, Jan, Miroslav Jelínek, Petr Písařík, Tomáš Kocourek, Jan Remsa, and Karel Jurek. "DLC/TI THIN FILMS PROPERTIES PREPARED BY HYBRID LASER TECHNOLOGIES." Acta Polytechnica CTU Proceedings 8 (June 30, 2017): 11–13. http://dx.doi.org/10.14311/app.2017.8.0011.

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Layers of diamond-like carbon are usable in many fields of industry as well as in medicine. Many scientific groups have worked with different types of deposition techniques to prepare DLC layers with improved or unique properties. The DLC properties could be improved by various dopations. In this study, we focused on DLC layers doped by titanium, prepared by hybrid laser depositions. Two techniques were used: Dual pulse laser deposition (DualPLD) and pulse laser deposition in combination with magnetron sputtering (PLD/MS). Preliminary tests for morphology, wettability, adhesion, hardness, corrosion, friction and wearability were examined.
2

Qian, Ying Ping, Ju Hua Huang, and Hai Ou Zhang. "Study on the Factors Influencing the Layer Precision in Hybrid Plasma-Laser Deposition Manufacturing." Advanced Materials Research 97-101 (March 2010): 3828–31. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3828.

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The present study is a continuation of the previous research on direct metal part fabrication with hybrid plasma-laser deposition manufacturing (PLDM). It is remarkably important for manufacturing high accurate part to investigate the factors influencing the precision of deposited layer and obtain the influence rules. Many factors perhaps affect the layer precision, such as average power of laser, repetition frequency, pulse width, hybrid angle between laser beam and plasma beam, speed of powder feed, deposition speed, and amount of feed along Z direction and so on. In this paper, the factors except laser parameters published in other paper were researched experimentally. The results were concluded as follows: (1) The width of the layer increases and the thickness decreases with the increasing of hybrid angle. (2) The depth of layer increases with the increasing of the amount of powder feed but the width of layer is nearly unchanged. (3) The width and thickness of layer reduces with the increasing of deposition speed. (4) The deviation between the amount of feed along Z direction and the depth of depositing layer makes the part precision decrease.
3

Zhao, Yuhui, Zhiguo Wang, Jibin Zhao, Zhenfeng He, and Hongwei Zhang. "Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate." Crystals 10, no. 10 (October 1, 2020): 891. http://dx.doi.org/10.3390/cryst10100891.

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The combination of additive manufacturing and conventional metal forming processes provides the possibility for improvements of forming efficiency and flexibility. Substrate preheating is an implementable technique to improve the interface adhesion properties of the hybrid forming method. The present experiment investigates the adhesion of additive manufactured 316 L steel on P20 and 1045 steel substrates under two substrate temperatures, and the geometrical characterization, interfacial microstructure and mechanical property of the hybrid specimens were compared. As a result, it was found that the ratio of deposition height to the width was reduced and the width was increased under substrate preheating. Tensile results show that the ultimate strength of 1045 and 316 L hybrid specimens was obviously increased, while the properties of hybrid specimens P20 and 316 L were similar, under different substrate temperature conditions. For the hybrid specimens with the metallurgically bonding characteristic, the tensile properties can reach the level of 316 L depositioned specimens fabricated by laser metal deposition (LMD). Furthermore, substrate preheating had little effect on the microstructure of the laser metal deposition zone, and significant influence on the microstructure of the heat affected zone, which was reflected in the difference of the hardness distribution.
4

Jelínek, Miroslav, Tomáš Kocourek, Josef Zemek, and Jaromír Kadlec. "SiCxLayers Prepared by Hybrid Laser Deposition and PLD." Plasma Processes and Polymers 6, S1 (March 17, 2009): S366—S369. http://dx.doi.org/10.1002/ppap.200930803.

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5

Fecht, Nikolaus. "Großbauteile per 3D-Druck/Large components – 3D-printed." wt Werkstattstechnik online 110, no. 11-12 (2020): 821–23. http://dx.doi.org/10.37544/1436-4980-2020-11-12-85.

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Im BMBF-Forschungsprojekt ProLMD entstanden in Teamarbeit neue Hybrid-Prozesse, die konventionelle Fertigungsverfahren mit Laserauftragschweißen (Laser Material Deposition, LMD) zu einem neuen Fertigungsansatz vereinen. Das Fraunhofer-Institut für Lasertechnik ILT aus Aachen arbeitete dabei eng zusammen mit sieben Industriepartnern und entwickelte drei Roboterzellen für diese neue Form der hybrid-additiven Fertigung. In the BMBF research project ProLMD, new hybrid processes were developed in teamwork, which combine conventional production methods with laser material deposition (LMD) to a new production approach. The Fraunhofer Institute for Laser Technology ILT in Aachen worked closely with seven industrial partners and developed three robot cells for this new form of hybrid-additive manufacturing.
6

Antoszewski, Bogdan, Hubert Danielewski, Jan Dutkiewicz, Łukasz Rogal, Marek St Węglowski, Krzysztof Kwieciński, and Piotr Śliwiński. "Semi-Hybrid CO2 Laser Metal Deposition Method with Inter Substrate Buffer Zone." Materials 14, no. 4 (February 4, 2021): 720. http://dx.doi.org/10.3390/ma14040720.

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This article presents the results of the metal deposition process using additive materials in the form of filler wire and metal powder. An important problem in wire deposition using a CO2 laser was overcome by using a combination of the abovementioned methods. The deposition of a multicomponent alloy—Inconel 625—on a basic substrate such as structural steel is presented. The authors propose a new approach for stopping carbon and iron diffusion from the substrate, by using the Semi-Hybrid Deposition Method (S-HDM) developed by team members. The proposed semi-hybrid method was compared with alternative wire and powder deposition using laser beam. Differences of S-HDM and classic wire deposition and powder deposition methods are presented using metallographic analysis, within optic and electron microscopy. Significant differences in the obtained results reveal advantages of the developed method compared to traditional deposition methods. A comparison of the aforementioned methods performed using nickel based super alloy Inconel 625 deposited on low carbon steel substrate is presented. An alternative prototyping approach for an advanced high alloy materials deposition using CO2 laser, without the requirement of using the same substrate was presented in this article. This study confirmed the established assumption of reducing selected components diffusion from a substrate via buffer layer. Results of metallographic analysis confirm the advantages and application potential of using the new semi-hybrid method for prototyping high alloy materials on low alloy structural steel substrate.
7

Hubler, Graham K. "Pulsed Laser Deposition." MRS Bulletin 17, no. 2 (February 1992): 26–29. http://dx.doi.org/10.1557/s0883769400040586.

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Research on materials grown by pulsed laser deposition, or PLD, has experienced phenomenal growth since late 1987 when T. Venkatesan (one of the authors for this issue) and co-workers pointed out that extreme nonequilibrium conditions created by pulsed laser melting of YBaCuO allowed in-situ preparation of thin films of this high transition temperature (Tc) superconducting material. Since then, PLD has emerged as the primary means for high throughput deposition of high-quality superconducting thin films for research and devices. This probably came as no surprise to J.T. Cheung (another of this issue's authors), who performed original research in this area and tirelessly labored during the 1980s to convince a skeptical audience of the advantages of PLD.Along with the success of PLD in the arena of high-temperature superconductivity, however, is the explosion of activity in the deposition of many other materials, made possible by the unique features of pulsed laser deposition, materials previously not amenable to in-situ thin film growth. Creative minds reasoned that since PLD can deposit a demanding, complex material such as the perovskite structure Y1Ba2Cu3O7-δ, why not other perovskites or multicomponent oxide materials? It also turns out that the range of properties of multicomponent oxides is virtually limitless. They can be metallic, insulating, semiconducting, biocompatable, superconducting, ferroelectric, piezoelectric, and so on. One is not limited to the properties of elements or binary compounds on which the electronics and microelectronics industries are based. Indeed, in a recent review of hybrid ferromagnetic- semiconductor structures, G. Prinz states, “… there has been little work devoted to incorporating magnetic materials into planar integrated electronic (or photonic) circuitry there are potential applications that have no analog in vacuum electronics but that remain unrealized, awaiting the development of appropriate materials and processing procedures.” In pulsed laser deposition, we may well have in hand the “appropriate processing procedure” to deposit sequential epitaxial layers of high quality materials that possess profoundly different properties.
8

Grzesik, Wit. "Hybrid manufacturing of metallic parts integrated additive and subtractive processes." Mechanik 91, no. 7 (July 9, 2018): 468–75. http://dx.doi.org/10.17814/mechanik.2018.7.58.

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This review paper highlights the hybrid manufacturing processes which integrate the additive and subtractive processes performing on one hybrid platform consisting of the LMD (laser metal deposition) unit and multi-axis CNC machining center. This hybrid technology is rapidly developed and has many applications in Production/Manufacturing 4.0 including the LRT (laser repair technology). In particular, some important rules and advantages as well as technological potentials of the integration of a powder metal deposition and finishing CNC milling/turning operations are discussed and overviewed. Some representative examples such as formation of difficult features around the part periphery, deposition of functional layers and coatings and repair of high-value parts in aerospace industry are provided. Moreover, the technological strategies, CAD/CAM and CAI programs and construction designs of the hybrid manufacturing platforms are explained. Some conclusions and future trends in the implementation of hybrid processes are outlined.
9

Qian, Ying Ping, Ju Hua Huang, and Hai Ou Zhang. "Influence of Laser Parameters on Precision in Hybrid Plasma Laser Deposition Manufacturing." Advanced Materials Research 97-101 (March 2010): 3811–15. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3811.

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The present study is a continuation of the previous research on direct metal component fabrication by hybrid plasma and laser deposition manufacturing (PLDM). The overall performance of component depends not only on the plasma but also on the laser. The purpose of this paper is to study the influence of laser parameters, such as average power, repetition frequency and pulse width, on the precision of single layer and analyze the influence rule. The results of this research are presented as follows: (1) The width of single layer decreases with the enhancing of average power and the thickness increases with the enhancing of average power. (2) The width of single layer minishes with the increasing of repetition frequency until it reaches a minimum value, and the thickness increases with the increasing of repetition frequency until it reaches a maximum value. (3) The width of single layer decreases with the increasing of pulse width and the thickness increases with the increasing of pulse width.
10

Kocourek, Tomas, Miroslav Jelinek, Jaromir Kadlec, Cyril Popov, and Antonino Santoni. "Thin TiCN Films Prepared by Hybrid Magnetron-Laser Deposition." Plasma Processes and Polymers 4, S1 (April 2007): S651—S654. http://dx.doi.org/10.1002/ppap.200731603.

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Статті в журналах Дисертації

Дисертації з теми "Laser hybrid deposition":

1

Skåre, Daniel Gundersen. "Pulsed Laser Deposition of ZnO Nanostructures for Hybrid Inorganic/Organic Solar Cells." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9940.

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Au catalyst ZnO nanostructures have been grown on the a- and c-plane sapphire substrate by PLD. Influence of substrate lattice orientation, substrate surface and different substrate annealing temperature have been characterized by AFM, SEM and XRD. This report shows that a-plane sapphire substrate annealed at 1000 degree C and 1200 degree C improves the growth condition of Au catalyst ZnO nanostructures. For c-plane sapphire; annealing at 1200 degree C and 1400 degree C enhances the nanostructure growth. The better growth condition is a result of the terrace-and-step morphology seen on the substrate surface prior to growth. This report also indicates a correlation between the azimuthal in-plane alignment of the grown nanostructures and the sapphire substrate lattice orientation.

2

Ren, Lan. "Integrated process planning for a hybrid manufacturing system." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Ren_09007dcc8046714a.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2008.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 18, 2008) Includes bibliographical references.
3

Juhasz, Michael J. "In and Ex-Situ Process Development in Laser-Based Additive Manufacturing." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu15870552278358.

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4

Perini, Matteo. "Additive manufacturing for repairing: from damage identification and modeling to DLD processing." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/268434.

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The arrival on the market of a new kind of CNC machines which can both add and remove material to an object paved the way to a new approach to the problem of repairing damaged components. The additive operation is performed by a Direct Laser Deposition (DLD) tool, while the subtractive one is a machining task. Up to now, repair operations have been carried out manually and for this reason they are errors prone, costly and time consuming. Refurbishment can extend the life of a component, saving raw materials and resources. For these reasons, using a precise and repeatable CNC machine to repair valuable objects is therefore very attractive for the sake of reliability and repeatability, but also from an economical and environmental point of view. One of the biggest obstacles to the automation of the repairing process is represented by the fact that the CAM software requires a solid CAD model of the damage to create the toolpaths needed to perform additive operations. Using a 3D scanner the geometry of the damaged component can be reconstructed without major difficulties, but figuring out the damage location is rather difficult. The present work proposes the use of octrees to automatically detect the damaged spot, starting from the 3D scan of the damaged object. A software named DUOADD has been developed to convert this information into a CAD model suitable to be used by the CAM software. DUOADD performs an automatic comparison between the 3D scanned model and the original CAD model to detect the damaged area. The detected volume is then exported as a STEP file suitable to be used directly by the CAM. The new workflow designed to perform a complete repair operation is described placing the focus on the coding part. DUOADD allows to approach the repairing problem from a new point of view which allows savings of time and financial resources. The successful application of the entire process to repair a damaged die for injection molding is reported as a case study. In the last part of this work the strategies used to apply new material on the worn area are described and discussed. This work also highlights the importance of using optimal parameters for the deposition of the new material. The procedures to find those optimal parameters are reported, underlying the pros and cons. Although the DLD process is very energy efficient, some issues as thermal stresses and deformations are also reported and investigated, in an attempt to minimize their effects.
5

Matsumura, Masashi. "Synthesis, electrical properties, and optical characterization of hybrid zinc oxide/polymer thin films and nanostructures." Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2009r/matsumura.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2007.
Title from PDF t.p. (viewed Feb. 3, 2010). Additional advisors: Derrick R. Dean, Sergey B. Mirov, Sergey Vyazovkin, Mary Ellen Zvanut. Includes bibliographical references (p. 122-145).
6

Kulish, Aleksandr. "Etude paramétrique d’un procédé d’impression 3D (LMD) en vue d’optimiser l’intégrité matière : Application à l’alliage maraging 1.2709." Thesis, Lyon, 2022. http://www.theses.fr/2022LYSEE001.

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La thèse de doctorat présentée dans ce travail est consacrée à une méthode innovante de production de moules d'injection plastique. Cette méthode combine la technologie additive laser, notamment le rechargement par injection coaxiale de poudre (LMD) et la technique de traitement laser visant à réduire les contraintes résiduelles. Par conséquent, l'objectif principal du présent travail est d'optimiser et d'analyser la méthode de fabrication proposée en ce qui concerne les propriétés finales des pièces déposées. L'étude paramétrique de LMD des "simples cordons", des structures de type "mur" et des "cubes" a été réalisée. La LMD d'échantillons cubiques a été analysée en fonction de la densité, des contraintes résiduelles et de la microstructure afin d’obtenir les paramètres optimaux de LMD. Les paramètres optimaux de LMD ont été vérifiés lors du dépôt à long terme d'échantillons cubiques et cylindriques en une seule et plusieurs fois. La tenue en fatigue ainsi que la densité, la microdureté et la microstructure ont ensuite été évaluées. La simulation numérique a également été réalisée pour prédire les champs thermiques générés pendant le procédé LMD. Enfin, cette thèse comprend l'étude numérique et expérimentale du processus de traitement laser (de détentionnement) visant à réduire les contraintes résiduelles et à éviter les post-traitements durables tels que le vieillissement
The PhD thesis presented in this work is dedicated to the innovative method of plastic injection mould production. This method combines laser additive technology, namely, the Laser Metal Deposition (LMD) and technique of laser treatment aiming to reduce the residual stresses. Therefore, the main objective of the present work is to optimize and analyze the proposed fabrication method regarding the final properties of deposited parts. The parametrical study of “single-bead”, multi-bead “wall” and multi-bead “cube” LMD has been carried out. The LMD of cubic specimens has been analyzed with respect to the density, residual stresses and microstructure in order to find the optimal deposition parameters. The optimal LMD parameters have been verified during the longtime deposition of cubic and cylindrical specimens in a single operating session and after multiple pauses. The fatigue resistance as well as the density, microhardness and microstructure were then evaluated. The numerical simulation has been also performed to predict the thermal fields generated during LMD. Finally, this thesis includes the numerical and experimental study of laser treatment process aiming to reduce the residual stresses and avoid the possible long-lasting post-treatment such as aging
7

Abedrrabba, Sarra. "Solutions innovantes pour des filtres de fréquences volumiques et semi-volumiques performants, en céramique, silice fondue et thermoplastique COC/COP... : nouvelles alternatives pour les futurs programmes de satellite multimédia." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0126/document.

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L’émergence des satellites très haut débit pour la couverture des zones rurales s’accompagne de nombreuses contraintes technologiques. Dans le cadre du plan France très haut débit, le projet THD-sat proposé par le CNES se base sur l’utilisation des bandes Q et V pour assurer les liaisons avec les stations au sol et libérer de la ressource sur la bande Ka communément utilisée par les satellites ancienne génération. Avec la montée en fréquence, les besoins en termes de filtrage deviennent très stricts nécessitant des considérations particulières. Le premier chapitre reprend le contexte de l’étude et expose les différents éléments permettant de justifier le choix de la technologie SIW qui profite à la fois des bons facteurs de qualité des modes volumiques se propageant dans le substrat et de l’aisance du procédé technologique et de l’intégration des structures planaires. Les performances des cavités SIW restent néanmoins intimement liées à l’épaisseur de substrat qui doit être augmentée pour atteindre de meilleurs facteurs de qualité. L’augmentation de l’épaisseur de substrat s’accompagne de deux principales limitations : le rallongement des fils de « bonding » utilisés pour le câblage du filtre à son environnement MIC d’épaisseur 254 μm et l’élargissement de la ligne d’accès 50 Ω induisant des problèmes de discontinuités et d’excitations de modes parasites. L’approche suivie consiste à considérer des formes 3D permettant l’adaptation de mode et d’épaisseur entre une ligne microruban sur substrat de 254 μm d’épaisseur et le SIW d’épaisseur plus importante. Une nouvelle transition 3D est dès lors imaginée. Le chapitre II reprend les différents procédés technologiques utilisés pour la mise en forme et la métallisation des substrats 3D. Les substrats considérés sont l’alumine et la silice fondue mis en forme par ablation laser et le thermoplastique COP mis en forme par moulage. La principale limitation de l’ablation laser concerne les épaisseurs de substrat accessibles. Nous nous limitons à 635 μm dans le cas de l’alumine et à 500 μm dans le cas de la silice fondue. Le moulage polymère permet de s’affranchir de cette limitation et de viser des substrats plus épais (2 mm pour la solution COP).Le chapitre III reprend les étapes de conception des différentes solutions de filtrage avec la nouvelle transition 3D. Des résultats de mesures de différents prototypes réalisés sont par ailleurs présentés. Ces résultats sont globalement encourageants mais nécessitent d’être davantage développés pour être mieux exploitables
The emergence of satellite high-speed internet for the coverage of rural zones is accompanied by numerous technological constraints. The current trend is to use higher frequency bands to release the satellite capacity for users. The increasing frequency requires new considerations especially for filtering needs which become notably strict in terms of performance and integration in small integrated circuits. This work introduces filtering solutions based on high quality factor Substrate Integrated Waveguides (SIW) using a novel 3D transition for a better integration in widely planar Hybrid ICs.The first chapter introduces the study’s context and the different elements justifying the use of the SIW technology.In fact, these structures profit from both the good quality factors of TE-modes propagating in the substrate and the easy fabrication process and integration of planar circuits. However, to increase the SIW quality factor, the substrate’s height should be increased which induces interconnection limitations such as long bond wires with high parasitic effects and large microstrip access lines with discontinuity problems and the propagation of parasitic modes. The adopted approach consists in imagining 3D shapes providing both mode and thickness matching between a microstrip line etched on a thin substrate and a high substrate SIW.The second chapter introduces the different manufacturing processes used for the substrate’s shaping and metallization. Three substrates are considered: Alumina, fused Silica and Cyclo Olefin Polymer COC. Alumina is widely used in space applications and has a well-mastered process. For equivalent dielectric losses, fused silica has a lower permittivity for bigger structures with less manufacturing tolerance sensitivity. Both Alumina and fused silica substrates are shaped using a laser ablation. The reachable substrate’s height using this machining method is relatively low. The polymer solution (COP) is elaborated using a molding process allowing higher substrates heights.The last chapter outlines the design steps of the different solutions and the measurement results of the first prototypes. These results are on the whole encouraging but require further development
8

Käbisch, Sven. "Hybridsolarzellen aus ZnO-Nanostrukturen und konjugierten Polymeren." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17240.

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Hybridsolarzellen werden sowohl aus ZnO-Schichten als auch ZnO-Nanostrukturen und Poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b'']dithiophen)-alt-4,7(2,1,3-benzothiadiazol)] (PCPDTBT) hergestellt. Das Wachstum der ZnO-Schichten und Nanostrukturen wird mittels gepulster Laserdeposition (PLD) auf Saphirsubstraten durchgeführt. Die Schichten weisen eine c-Achsenorientierung auf. Die Polarität einer ZnO-Schicht bestimmt die Morphologie der nachfolgend gewachsenen ZnO-Nanostrukturen. Dabei kann die Morphologie kontrolliert zwischen Nanostäbchen auf einer O-terminierten ZnO-Schicht und Nanowänden auf einer Zn-terminierten ZnO-Schicht eingestellt werden. Untersuchungen mittels konvergenter Elektronenbeugung zeigen, dass die Nanostrukturen immer Zn-terminiert sind. Die Grenzfläche zwischen ZnO und PCPDTBT wird mit Photoelektronenspektroskopie untersucht und ergibt eine Vakuumniveauangleichung zwischen beiden Materialien. Prinzipiell ist der Übergang für photovoltaische Aktivität geeignet, jedoch sind die erzielten Wirkungsgrade sehr niedrig. Die Ursache ist eine niedrige Exzitonendissoziationseffizienz, die durch die Benutzung von sol-gel ZnO, kleinen organischen Molekülen und einer niedrigeren Leitfähigkeit vom PLD-ZnO verbessert werden kann. Dennoch beträgt der maximale Wirkungsgrad der Hybridsolarzellen nur 0,21 %.
Hybrid solar cells are built from ZnO layers and ZnO nanostructures and Poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b'']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT). The growth of the ZnO layers and nanostructures is performed with pulsed laser deposition (PLD) on sapphire substrates. The samples exhibit a c-axis orientation. The polarity of a ZnO layer determines the morphology of subsequently grown ZnO nanostructures. One can control the morphology between ZnO nanorods on an O-terminated layer and nanowalls on a Zn-terminated layer. Studies with convergent electron beam diffraction reveals that the ZnO nanostructures are always Zn-terminated. The interface between ZnO and PCPDTBT is studied with photoelectron spectroscopy and shows a vacuum level alignment between both materials. In principle, the interface is suitable for photovoltaic activity, however, the achieved power conversion efficiencies are very low. This is due to a low exciton dissociation efficiency, which can be improved by the use of sol-gel ZnO, small organic molecules, and a lower conductivity of the PLD ZnO. Nevertheless, the maximum power conversion efficiency amounts to 0.21 %, only.
9

Jaggernauth, Aneeta. "Polymer funcionalization of nano-graphene oxide by molecular layer deposition." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14832.

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Анотація:
Mestrado em Engenharia de Materiais
O presente trabalho aborda o processo de funcionalização por via seca de nanopartículas de óxido de grafeno (nano-GO) visando o estabelecimento de ligações a polietilenoglicol (PEG) na sua superfície. Atualmente utilizam-se métodos químicos de funcionalização por via húmida com esta finalidade, no entanto são demorados e resultam em perdas significativas de amostra. O trabalho foi realizado em duas fases: o GO foi primeiramente sintetizado em forma de filme e pó utilizando um método “Hummers” modificado, sendo caracterizado por FTIR, SEM e DLS; em seguida o GO foi exposto aos precursores do PEG num reator de deposição por camada molecular (MLD) sob condições de vácuo. Utilizaram-se temperaturas diversas de deposição, tendo-se observado uma adsorção ótima entre 90-100° C. Primeiramente, a deposição de PEG em pó de GO, com terminações de amina, confirmou por FTIR a presença dos picos característicos de PEG, aproximadamente aos 2925 cm-1 e 2850 cm-1, corroborando a funcionalização a seco do GO por um mecanismo de vaporização-condensação. A via MLD, usando TMA e EG como precursores foi então realizada no pó de GO, tendo proporcionado uma camada de passivação inicial rica em alumínio, na qual ciclos subsequentes de exposição ao monómero EG resultaram na sua adsorção e polimerização, tal como demonstrado por FTIR e análises EDS. O nano-GO-PEG é vantajoso para aplicações na área da biomedicina, incluindo sistemas de administração de fármacos, biossensores e terapia fototérmica. O PEG permite ao nano-GO ser reconhecido como biocompatível, estabelecendo uma superfície repelente e incrementando o transporte citoplasmático, permitindo assim características essenciais, tais como alta absorvância óptica, fluorescência e estabilidade em meio fisiológico, essenciais para os sistemas biológicos. O sucesso da produção do nano-GO funcionalizado com PEG pela via a seco aqui proposta poderá será favorável para outros tipos de funcionalização e copolimerização de nanopartículas.
This research aims to achieve a dry functionalization approach for covalently attaching polyethylene glycol (PEG) onto the surface of nano-graphene oxide (GO). Currently, wet chemical methods are used to achieve this, being characteristically time consuming and resulting in significant loss of sample. This work is carried out in two stages; GO is first synthesized using a modified Hummers’ method, and then characterized by FTIR, SEM and DLS; it is then produced in film and powder form, for exposure to precursors in an MLD reactor under rough vacuum conditions. GO films were exposed to PEG at variable temperatures, determining that at 90oC and 100oC the optimal adsorption occurred. Deposition of amine-terminated PEG on GO powder confirmed the presence of characteristic PEG peaks around 2925cm-1 and 2850cm-1 via FTIR, substantiating the dry functionalization of GO via vaporization-condensation. An MLD route, using TMA and EG precursors was then performed on GO powder, delivering an initial passivation layer of Al, onto which subsequent cycles of EG adsorbs, demonstrated by FTIR and EDS analysis. PEGylated-nano-GO is advantageous for applications in the area of biomedicine; including drug delivery systems, biosensors and photothermal therapy. PEG permits nano-GO to be recognized as biocompatible; establishing on it a non-fouling surface and increasing its cytoplasmic transport, thereby allowing its inherent characteristics such as high optical absorbance, fluorescence, and stability in physiological media to be pertinent to biological systems. Successful production of PEG functionalized nano-GO via the proposed method will be favourable for other possibilities of nanoparticle surface functionalization and copolymerization.
10

Lin, Youqin. "Deposition of a carbon or polypyrrole nano-layer on carbon nanotubes-alumina hybrids and its impact on their mechanical and physical properties." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2012. http://www.theses.fr/2012ECAP0004.

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Анотація:
La croissance de nanotubes de carbone (NTC) sur particules micrometriques d'alumine (Al2O3) permet d'obtenir une dispersion uniforme des NTC dans des matrices sans enchevêtrement de NTC. Ce type de structure hybride NTC-Al2O3 fournit également une solution prometteuse au problème de sécurité de NTC car ils intègrent NTC avec des particules micrométriques, étendant la dimension des NTC à partir de nano-échelle au micro-échelle. Cependant, l'adhérence entre les NTC et les Al2O3 particules ne permet pas de fixer efficacement les NTC. Par ailleurs, une autre préoccupation essentielle de NTC est de savoir comment créer une forte adhésion interfaciale entre les NTC et les matrices polymères pour obtenir de bonnes propriétés mécaniques et de ne pas diminuer la conductivité électrique de NTC. Motivé par ces considérations, cette thèse vise à proposer plusieurs techniques concernant le dépôt d'une nano-couche conductrice sur la surface des structures hybrides NTC-Al2O3. De plus, les impacts de la nano-couche déposée sur la fixation des NTC à la surface d’Al2O3, sur la conductivité électrique des hybrides NTC-Al2O3, et sur l'adhésion interfaciale des systèmes NTC-Al2O3/epoxy composites sont étudiés en détail
Growth of carbon nanotubes (CNTs) on micro-sized alumina (Al2O3) particles helps to achieve a uniform dispersion of CNTs in matrices without CNT entanglement. This kind of CNT-Al2O3 hybrids also provides a promising solution to the CNT safety problem since they integrate CNTs with micrometric particles, extending dimension of CNT fillers from nano-scale to micro-scale. However, the adhesion between the CNTs and the Al2O3 particles doesn’t sufficiently enable to fix the CNTs firmly and stably. Besides, another crucial concern of CNTs is how to create a strong interfacial adhesion between CNTs and polymer matrices for good mechanical properties and meanwhile not to degrade CNTs’ electrical conductivity. Motivated by these considerations, this PhD thesis aims to establishing several techniques for deposition of an electrically conductive nano-layer on the surface of CNT-Al2O3 hybrids. And the impacts of the deposited nano-layer on the fixing the CNTs on the Al2O3 surface, on bulk electrical conductivity of the CNT-Al2O3 hybrids, and on the interfacial adhesion of CNT-Al2O3/epoxy composite systems are investigated in detail
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Частини книг з теми "Laser hybrid deposition":

1

Manshina, Alina. "Laser-Induced Deposition of Metal and Hybrid Metal-Carbon Nanostructures." In Springer Series in Chemical Physics, 387–403. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05974-3_20.

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2

Badea, Nicoleta, M. Jelinek, T. Tite, Mariana Prodana, A. Campean, and Ioana Demetrescu. "The Behavior of SiC Films Fabricated by Hybrid Laser-Magnetron Deposition after Immersion." In Key Engineering Materials, 537–40. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-422-7.537.

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3

Van, L. H., M. H. Hong, and J. Ding. "Pulsed Laser Deposition and Fabrication of CoO/ZnO and CoO/TiO2 Nano-Hybrid Thin Film." In Solid State Phenomena, 131–34. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-18-3.131.

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4

George, Steven M., Byunghoon Yoon, Robert A. Hall, Aziz I. Abdulagatov, Zachary M. Gibbs, Younghee Lee, Dragos Seghete, and Byoung H. Lee. "Molecular Layer Deposition of Hybrid Organic-Inorganic Films." In Atomic Layer Deposition of Nanostructured Materials, 83–107. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527639915.ch5.

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Meng, Xiangbo. "Molecular Layer Deposition of Organic–Inorganic Hybrid Materials." In Optoelectronic Organic–Inorganic Semiconductor Heterojunctions, 37–70. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367348175-3.

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6

Park, S. J., B. K. Ahn, Prashant Sudhir Alegaonkar, H. J. Shin, and Ji Beom Yoo. "Fabrication of Porous Al2O3 and TiO2 Thin Film Hybrid Composite Using Atomic Layer Deposition and Properties Study." In Solid State Phenomena, 1273–76. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.1273.

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7

Tlotleng, Monnamme, Esther T. Akinlabi, Mukul Shukla, and Sisa Pityana. "Application of Laser Assisted Cold Spraying Process for Materials Deposition." In Surface Engineering Techniques and Applications, 177–221. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-5141-8.ch006.

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The Laser-Assisted Cold Spraying (LACS) process is a hybrid technique that uses laser and cold spray mechanism to deposit solid powders on metal substrates. For bonding to occur, the particle velocities must be supersonic. The supersonic effects can be achieved by passing a highly compressed Nitrogen gas (˜30 bars) through de Laval supersonic nozzle. LACS is a surface coating technique that is desirable in rapid prototyping and manufacturing, particularly for biomedical applications. Current world research reveals that the capability of the LACS regarding the enhancement of surface properties of coating titanium alloys with hydroxyapatite will be essential for fabricating scaffolds for bone implants using Laser Engineered Net Shaping (LENS) technique. In this chapter, coatings of composite powders made of titanium and hydroxyapatite deposited on Ti-6Al-4V substrate by LACS technology are presented. These coatings were successfully characterised by means of X-Ray Diffraction (XRD) and optical microscopy for their phases, composition, and microstructure, respectively. The results of the produced LACS coatings compare well with those obtained with traditional thermal spray and cold spray techniques, respectively. In addition, the XRD results were found to be similar to the precursor powders, which indicated that no phase transformation occurred to HAP. Coatings comprising of other crystalline phases of HAP are less bio-integrable and fail quicker within the human body fluids environments.
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"Organic and Hybrid Materials." In Atomic Layer Deposition, 207–13. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118747407.ch7.

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Тези доповідей конференцій з теми "Laser hybrid deposition":

1

Kotlyarchuk, Bohdan K., and Dmytro I. Popovych. "Pulsed laser deposition of phosphor nitride thin films." In International Workshop on Optoelectronic and Hybrid Optical/Digital Systems for Image/Signal Processing, edited by Simon B. Gurevich, Zinovii T. Nazarchuk, and Leonid I. Muravsky. SPIE, 2000. http://dx.doi.org/10.1117/12.388454.

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2

Zhong, Minlin, Ting Huang, Yu Gu, Changsheng Dong, Lin Li, and Wenjin Liu. "Fabrication and characterization of nanoporous manganese structure by laser deposition hybrid selective electrochemical dealloying." In ICALEO® 2011: 30th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2011. http://dx.doi.org/10.2351/1.5062207.

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3

Kocourek, Tomáš, Miroslav Jelínek, Václav Studnička, and Jaromír Kadlec. "Study of thin TiCxN1-x films fabricated by hybrid magnetron-laser deposition." In SPIE Proceedings, edited by Pavel Tománek, Miroslav Hrabovský, Miroslav Miler, and Dagmar Senderákova. SPIE, 2006. http://dx.doi.org/10.1117/12.675656.

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4

Gu, Yu, Mingxing Ma, Minlin Zhong, Wenjin Liu, Changsheng Dong, and Yide Kan. "Investigation on the electrochemical catalysis properties of Ni-decorated nanoporous copper formed by hybrid laser deposition." In ICALEO® 2009: 28th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2009. http://dx.doi.org/10.2351/1.5061564.

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5

Stiff-Roberts, Adrienne D., Ryan Pate, Ryan McCormick, and Kevin R. Lantz. "RIR-MAPLE deposition of conjugated polymers and hybrid nanocomposites for application to optoelectronic devices." In INTERNATIONAL SYMPOSIUM ON HIGH POWER LASER ABLATION 2012. American Institute of Physics, 2012. http://dx.doi.org/10.1063/1.4739888.

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6

Zhong, Minlin, Changsheng Dong, Ting Huang, and Mingxing Ma. "Tunable nanoporous metallic structures formed by hybrid laser deposition and chemical etching and their functionalization." In Laser and Tera-Hertz Science and Technology. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/ltst.2012.mf4a.1.

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7

Tylczak, Erik, David Peterson, and Graham Candler. "Hybrid RANS/LES Simulation of Transverse Jet in Supersonic Crossflow with Laser Energy Deposition." In 40th Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-4856.

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8

Serbezov, Valery, and Sotir Sotirov. "One-step synthesis of hybrid inorganic-organic nanocomposite coatings by novel laser adaptive ablation deposition technique." In Seventeenth International School on Quantum Electronics: Laser Physics and Applications, edited by Tanja N. Dreischuh and Albena T. Daskalova. SPIE, 2013. http://dx.doi.org/10.1117/12.2012003.

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9

Ruan, Jianzhong, Kunnayut Eiamsa-ard, Jun Zhang, and F. W. Liou. "Automatic Process Planning of a Multi-Axis Hybrid Manufacturing System." In ASME 2002 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/detc2002/dac-34138.

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With the integration of multi-axis layered manufacturing and material removal (machining) processes, a hybrid system has more capability and flexibility to build complicated geometry with a single setup. Process planning to integrate the two different processes is a key issue. In this paper, an algorithm of adaptive slicing for five-axis Laser Aided Manufacturing Process (LAMP) is summarized which can generate uniform- or non-uniform slices. In order to avoid interruption in the deposition process for one slice, a skeleton-based offset deposition tool-path method is used to generate continuous moving paths. A method to build a non uniform (thickness) layer which utilizes two processes is presented and an overall algorithm for integration is described. The newly developed algorithm implemented in the process planning helps the hybrid system build part more efficiently.
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Adinarayanappa, Somashekara Makireddypalli, and Suryakumar Simhambhatla. "Determination of Process Parameter for Twin-Wire Weld-Deposition Based Additive Manufacturing." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34658.

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Various energy sources are available for sintering and/or depositing the material in additive manufacturing for metallic objects. These can be mainly categorized as laser based, electron beam based and arc based. While laser and electron offer better surface finish, it is possible to achieve high deposition rates in arc based weld-deposition. The inferior surface finish can be compensated by going for a hybrid system, combining deposition and machining. Twin-wire based weld-deposition, used in the present work, makes it possible to even realize functionally gradient material matrix; the use of two different filler materials into a single weld-pool makes this possible. Wire speed, torch speed and filler material are important factors that effect the composition of the deposited volume. Determination of the operating range and effect of these process parameters therefore is important to control the properties of the weld-deposited gradient objects. The current work presents the material composition of two filler materials ER70S6 and ER110SG with different wire speed and torch speed. Deposited material elemental compositions were analyzed using ED-XRF machine.

Звіти організацій з теми "Laser hybrid deposition":

1

George, Steven M. Hybrid Organic-Inorganic Films Grown Using Molecular Layer Deposition. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada540366.

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2

Tian, Yongming, Yongqian Gao, and Sivakumar Challa. Layer-by-layer deposition of ultra-thin hybrid/microporous membrane for CO2 separation. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1411444.

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