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Dissertations / Theses on the topic 'Surface treatment layer'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Källgren, Rasmus. "Influence of level of cellulose oxidation and surface treatment on the adhesion between cellulose beads." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276412.

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With the growing impact of climate change on both political decisions and how companies develop their products, it is increasingly important to find environmentally friendly alternatives to fossil-based materials. One of the more interesting materials in this respect is cellulose, which is the world's most naturally occurring polymer and can be used in a variety of applications. One way to modify the fibers and to change their properties is to use a method called Layer-by-Layer (LbL) treatment where two polymers of opposite charge are alternately adsorbed to the fiber surface. Another possibil

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2

Kitwiroon, Nutthida. "Treatment of surface boundary layer parameters for modelling air quality in urban regions." Thesis, University of Hertfordshire, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431958.

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3

Monjarret, Ronan. "The multi-layer shallow water model with free surface : treatment of the open boundaries." Toulouse 3, 2014. http://www.theses.fr/2014TOU30334.

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This PhD dissertation, conducted as a collaboration between the SHOM and the University of Toulouse, deals with improving the treatment of open boundary conditions, for the multi-layer shallow water model with free surface. One of the main difficulties with such an objective is the determination of the modes associated to the internal surfaces liquid/liquid: the baroclinic modes. The work of this thesis focusses on two axes: The first one concerns the eigenstructure of the differential operator, associated to the general model. This allows to insure conditions of hyperbolicity and local wellpo

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4

Piecha, Julita. "Segregation of ions in surface layer of the LiNbO3 single crystal induced by proton exchange reaction and by thermal treatment." Doctoral thesis, Katowice : Uniwersytet Śląski, 2016. http://hdl.handle.net/20.500.12128/713.

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Niobian litu to ferroelektryczny kryształ otrzymywany metodą Czochralskiego, wykazuje on strukturę romboedryczną z grupą przestrzenną R3c. Charakteryzuje się wysokimi wartościami temperatury Curie (TC≈1120 °C) oraz temperatury topnienia (Tm≈1230 °C). Celem moich badań było określenie wpływu reakcji protonizacji oraz redukcji na segregację jonów litu w warstwie powierzchniowej kongruentnego LiNbO3. Wysoką mobilność jonów litu w warstwie powierzchniowej oraz ich migrację z wnętrza kryształu ku jego powierzchni wykorzystano w procesie wymiany jonowej Li+/H+. Reakcję wymiany protonowej prowadzono

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5

Domfang, Ngnekou Julius-Noël. "Étude expérimentale de la tenue en fatigue de l’alliage AlSi10Mg élaboré par fusion laser de lit de poudre Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy Fatigue resistance of selectively laser melted aluminum alloy under T6 heat treatment Fatigue properties of AlSi10Mg produced by Additive Layer Manufacturing." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2019. http://www.theses.fr/2019ESMA0015.

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Ce travail montre l'impact des défauts et de la microstructure sur la limite de fatigue de l’AlSi10Mg de fabrication additive (FA). Les échantillons d’étude sont fabriqués suivant trois orientations (0 °, 45 ° et 90 °) ; les surfaces d’étude sont usinées ou brutes de fabrication. Les éprouvettes sont étudiées avec ou sans traitement thermique T6. Avant toute chose, le matériau est d’abord caractérisé en lien avec les paramètres du procédé à l’aide de plusieurs moyens (microscopie, microtomographie). Du point de la fatigue, les courbes S-N sont établies avant et après T6, principalement à R = -

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6

Stravinskas, Egidijus. "Detergentų valymas iš nuotekų taikant suspenduoto sluoksnio metodą." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100628_093214-26342.

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Baigiamajame darbe pateikta: detergentų paplitimas, jų fizikinės, cheminės savybės, klasifikacija ir daroma žala aplinkai. Analizuojami detergentais užterštų nuotekų valymo metodai. Analizuojami dujų burbuliukų susidarymo detergentų tirpaluose ypatumai, aprašomos dinaminės ir statiškai stabilios putos, pateikiama putų aparatų charakteristika. Pateikiamos suspenduoto sluoksnio charakteristikos ir jo galimybės detergentams iš nuotekų valyti. Darbo tikslas – ištirti suspenduoto sluoksnio įtaką valant detergentus iš nuotekų. Darbą sudaro 7 dalys: įvadas; tyrimo objektas ir problemos aprašymas; det

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7

Дробязко, М. Н., Володимир Іванович Савчук, Владимир Иванович Савчук та Volodymyr Ivanovych Savchuk. "Повышение производительности полирования шаровых поверхностей пробок в статически уплотнённой абразивной среде". Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/39454.

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Технологический процесс отделочной обработки шаровых поверхностей пробок предусматривает метод полирования, который обязан обеспечить точность формы в пределах 20-40 мкм и шероховатость Ra=0,2- 0,25 мкм. Режущим инструментом при полировании являются абразивные эластичные круги и ленты, струя абразивной жидкости во вращающихся барабанах и вибрационных контейнерах. Применяемые способы обработки имеют низкую производительность, не обеспечивают качественных показателей участков шаровой поверхности, что требует применения дорогостоящего оборудования и инструментов, рабочих высокой квалифик

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8

Gemelli, Enori. "Elaboration et étude de la tenue à l'oxydation à haute température d'alliages de surface obtenus par irradiation laser sur deux aciers ferritiques peu alliés." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0075.

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L'objectif du travail presente ici est d'augmenter, par un traitement de surface, la tenue a l'oxydation a temperature elevee et la durete d'aciers ferritiques faiblement allies. Nous presentons les resultats obtenus avec les aciers 35ncd16 et z38cdv5 par irradiation laser assurant l'incorporation superficielle et la dissolution de predepots de nitrures (aln, si#3n#4) ou de carbures (sic, cr#3c#2). Nous precisions les conditions d'obtention d'alliages de surface exempts de fissures, d'amas ou de porosites. La durete de ces alliages depend principalement de la formation de martensite et (ou) de

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9

Dombková, Julie. "Cílená příprava kompozitu na bázi PP + anorganické mikro resp. nano anorganické plnivo s různou adhezní mezivrstvou." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216822.

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The diploma thesis studies composite of PP and filler particle. As a particle filler was used commercially available CaCO3 (SOCAL 31). The submitted thesis had a goal to find new approaches and technologies of filler surface treatment in order to improve properties of composite materials. The plasma discharge behind static pressure was used for the surface treatment of the fillers. These fillers were afterwards analyzed by using of sedimentation analysis, turbidimetry, infra-red spectroscopy (FT-IR), X-ray diffraction analysis (XRD), scan electron microscopy (SEM), transmission electron micros

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10

Iacob, Constantin. "Transfert thermique et transfert de masse en lit fluidise. Application à la nitruration d'aciers." Rouen, 1996. http://www.theses.fr/1996ROUES020.

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Le lit fluidisé a d'excellentes propriétés, comme milieu de chauffage, quant à l'homogénéité de sa température et aux valeurs du coefficient de transfert thermique. Pour des conditions de chauffage bien définies, le coefficient d'échange thermique lit fluidise-pièce immergée dépend de la vitesse de fluidisation, de la taille des particules du lit et des dimensions des pièces à chauffer. Le transfert de matière entre le lit fluidisé et des surfaces immergées a été étudié dans le cas de traitements thermochimiques de nitruration. Les paramètres dynamiques du lit et la composition du mélange de n

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11

Katakam, Shravana K. "Laser Surface Treatment of Amorphous Metals." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500194/.

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Amorphous materials are used as soft magnetic materials and also as surface coatings to improve the surface properties. Furthermore, the nanocrystalline materials derived from their amorphous precursors show superior soft magnetic properties than amorphous counter parts for transformer core applications. In the present work, laser based processing of amorphous materials will be presented. Conventionally, the nanocrystalline materials are synthesized by furnace heat treatment of amorphous precursors. Fe-based amorphous/nanocrystalline materials due to their low cost and superior magnetic prope

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12

Appusamy, Boopathy Harish, and Pavan Kumar Bonthala. "Electrochemical etching and anodizing as key stages of surface treatment of aluminium foil for electrolytic capacitor industry : Application of Electro Chemical Impedance Spectroscopy as non-destructive characterization of etched anode foil with an anodized dielectric oxide layer." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Produktutveckling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-37858.

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In the initial stage, the sample preparation was done by using the techniques of Anodic etching and anodic forming processes where a repeated trial and error method of sample preparation headed towards making out a suitable sample set for characterization. After this step, the set of 2 different industrial samples were introduced and anodic oxide forming process was carried out in different electrolytes. In the sample preparations, 4 different electrolytes were used 15% wt. Ammonium Adiphate, 1.5% wt. Ammonium Phosphate, 7% wt. Boric acid and 15% Penta Borate at different stages for perform

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13

Pacquentin, Wilfried. "Contribution à l'étude des propriétés physico-chimiques des surfaces modifiées par traitement laser : application à l'amélioration de la résistance à la corrosion localisée des aciers inoxydables." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00676332.

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Les matériaux métalliques sont utilisés dans des conditions de plus en plus sévères et doivent présenter une parfaite intégrité sur des périodes de plus en plus longues. L'objectif de ce travail de thèse est d'évaluer le potentiel d'un traitement de refusion laser pour améliorer la résistance à la corrosion d'un acier inoxydable de type 304L ; l'utilisation du laser dans le domaine des traitements de surface constituant un procédé en pleine évolution à cause des changements récents dans la technologie des lasers. Dans le cadre de ce travail, le choix du laser s'est porté sur un laser nano-impu

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14

Sexton, Cornelius Leo. "Rapid Alloy Scanning by laser cladding." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320605.

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15

Colin, Dominique. "Obtention, corrosion et analyse de surface d'alliages amorphes inoxydables." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0111.

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Apres leur elaboration et leur caracterisation metallurgique (structure, composition, geometrie, stabilite thermique. . . ), cette etude examine les roles de la composition et de la structure de l'alliage sur les tenues a la corrosion generalisee et a la corrosion localisee d'alliages amorphes inoxydables (fe, ni, cr) (p, b) et (fe, cr) (p, b, si) dans des milieux acides sans chlorure et neutres chlorures. Le comportement en corrosion generalisee et la resistance a la corrosion par piqures des alliages amorphes sont compares aux comportements d'aciers inoxydables rapidement solidifies et de l'

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16

Primartomo, A. "Laser surface treatment using customised heat source profiles." Thesis, Loughborough University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429008.

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17

Ng, Chi-Ho. "Laser surface modification of NiTi for medical applications." Thesis, University of Chester, 2017. http://hdl.handle.net/10034/620830.

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Regarding the higher demand of the total joint replacement (TJR) and revision surgeries in recent years, an implant material should provide much longer lifetime without failure. Nickel titanium (NiTi) is the most popular shape memory alloy in the industry, especially in medical devices due to its unique mechanical properties such as pseudo-elasticity, damping capacity, shape memory and good biocompatibility. However, concerns of nickel ion release of this alloy still exist if it is implanted for a prolonged period of time. Nickel is well known for the possibility of causing allergic response a

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18

Coste, Jean-François. "Détermination non destructive de l'épaisseur de revetements projetés plasma au moyen d'ondes de surface rayonnantes." Grenoble INPG, 1996. http://www.theses.fr/1996INPG4202.

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Les revetements metalliques deposes par projection plasma sous vide sur les pales de turbines a gaz ameliorent leur resistance a la corrosion et augmentent ainsi leur duree de vie. Cependant, le controle de qualite et l'inspection en service de ces pales revetues consistent simplement en une inspection visuelle et en un examen micrographique destructif. Pour ces raisons, les fabricants et les utilisateurs de turbines a gaz deploient un effort important pour le developpement de techniques non destructives. L'epaisseur du revetement represente un parametre d'interet puisqu'il caracterise l'effic

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19

Yang, Wen Fu. "Laser cladding surface treatment for enhancement of mechanical properties." Thesis, Peninsula Technikon, 2003. http://hdl.handle.net/20.500.11838/1267.

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Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2003<br>Systematic laser cladding experiments were performed using a mixture of a Nickel base alloy powder mixed with tungsten carbide powder (percentage contents of tungsten carbide from 10% to 40%) on EN8 steel substrate with pre-placed powder method. Laser cladding of the Nickel base alloy powder + 50% tungsten carbide powder on EN9 steel substrate was performed with powder injection method as well. A Finite Element Method for calculating the surface temperature distribution was used to help prediction of temperature

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20

Chan, Weng Kin. "Effect of heat treatment and laser surface treatment on the corrosion behavior of stainless steels." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493669.

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Shukla, Pratik P. "Viability and characterization of the laser surface treatment of engineering ceramics." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8426.

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Laser surface treatment of engineering ceramics offers various advantages in comparison with conventional processing techniques and much research has been conducted to develop applications. Even so, there still remains a considerable gap in knowledge that needs to be filled to establish the process. By employing a fibre laser for the first time to process silicon nitride (Si3N4) and zirconia (ZrO2) engineering ceramics, a comparison with the CO2 and a Nd:YAG lasers was conducted to provide fundamental understanding of various aspects of the laser beam-material interaction. Changes in the morph

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22

Wellburn, Daniel. "Circular laser beam intensity profile shaping for uniform surface treatments." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533912.

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23

Belaud, Vanessa. "Structuration de surfaces au moyen d'un traitement laser femtoseconde : applications à la fonctionnalisation de surface du polypropylène en vue de sa métallisation." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0003/document.

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Ce présent travail de thèse porte sur l’étude du potentiel d’un traitement de surface par laser femtoseconde comme étape de substitution aux traitements réalisés actuellement lors de la métallisation de polymère. Pour cela, l’étude des modifications chimiques et morphologiques induites par traitement laser femtoseconde ainsi que leurs influences respectives sur les propriétés d’adhérences et de mouillabilités de la surface polypropylène sont présentées. Une revue bibliographique met en évidence la faisabilité d’une modification contrôlée de la surface du polypropylène après traitement laser fe

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Dolan, Jeffrey Alan. "Characterization of Laser Modified Surfaces for Wood Adhesion." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64352.

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The controlled degradation of wood surfaces with infrared light from a CO2 pulsed laser facilitated adhesion without the use of additional resins. Laser modification creates a surface phenomenon that physically and chemically alters the natural biopolymer organization of lignocellulosic materials in a way that promotes adhesion when hot pressed using typical industrial equipment. Laser optimization was determined through mechanical and microscopic observation. It was determined that a mild level of laser surface modification (scale of 30 W/mm2) resulted in the highest bond-line strength. The l

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Suggs, Allison Elizabeth. "Kr-F laser surface treatment of poly(methyl methacrylate), glycol-modified poly(ethylene terephthalate), and polytetrafluoroethylene for enhanced adhesion of Escherichia Coli K-12." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35182.

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Environmental response as determined by the cell-polymer interaction stands as the greatest restriction to the implementation of new polymeric materials. Cell-polymer interactions are most influenced by substrate surface free energy, surface chemistry, topography, and rigidity[1]. Alteration of these properties through surface treatment has become a common approach to attain the desired cellular interaction. This study investigates Kr-F excimer laser(248 nm) surface modification of poly(methyl methacrylate), glycol-modified poly(ethylene terephthalate), and polytetrafluoroethylene and its

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Jeng, Jeng-Ywan. "Computer controlled laser surface treatments of stainless steels for improved corrosion resistance." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250360.

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BENDRAOUI, ABDELLATIF. "Traitements chimiques et thermiques de composes semi-conducteurs iii-v a base de in, ga, as, p en vue d'une reprise d'epitaxie." Clermont-Ferrand 2, 1989. http://www.theses.fr/1989CLF21151.

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L'etat de surface des semiconducteurs iii-v avant la reprise d'epitaxie conditionne les proprietes electroniques et la stabilite des composants realises. Mise en evidence de l'aspect dynamique de stabilisation des composes iii-v a base de in, ga, p et as sous hydrures. Developpement d'une methode originale de stabilisation statique de ces composes a base de chlorures d'in. Analyse des resultats experimentaux et interpretation en utilisant des modeles theoriques bases sur la thermodynamique statistique

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Elkandari, Bader M. H. M. "Excimer laser surface melting treatment on 7075-T6 aluminium alloy for improved corrosion resistance." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/excimer-laser-surface-melting-treatment-on-7075t6-aluminium-alloy-for-improved-corrosion-resistance(c2da3b82-eeb5-4eae-a1dc-e4aefba18c62).html.

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High strength 7xxx aluminium alloys are used extensively in the aerospace industry because the alloys offer excellent mechanical properties. Unfortunately, the alloys can suffer localised corrosion due to the presence of large intermetallic particles at the alloy surface that are aligned in the rolling direction. Laser surface melting (LSM) techniques offer the potential to reduce and/or to eliminate the intermetallic phases from the surface of the alloy without affecting the alloy matrix.The present study concerns the application of LSM using an excimer laser to enhance the corrosion resistan

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Waugh, David G. "Laser surface treatment of nylon 6,6 for the modification of wettability characteristics and subsequent enhancement of osteoblast cell response." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6591.

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The control of cell adhesion to synthetic polymers is a key factor in tissue engineering, resting on the ability to direct specific cell types to adhere and proliferate in order to stimulate tissue reconstruction. But often the surface properties are compromised for the sake of the bulk properties, leading to surfaces that do not support sufficiently the level of bioactivity required and accordingly the polymeric biomaterial will fail clinically. Laser treatment offers a unique means of enhancing the osteoblast cell response of the surface of a polymeric biomaterial, whilst keeping the already

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OLIVEIRA, FELIPE de. "Estudo de camadas finas tratadas por laser em anéis de pistão." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10048.

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Made available in DSpace on 2014-10-09T12:34:11Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:38Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Zhang, Bo Kai. "A study on nanocomposite hydroxyapatite coatings on Ti6Al4V fabricated by electrophoretic deposition and laser surface treatment." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493696.

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Rezai, Bidakhavidi Caminde. "Nouvelles solutions de préparation et d'activation des surfaces : assemblages époxy-fonte." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCA021/document.

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Les revêtements organiques déposés en surface de tuyaux en fonte ductile ont pour vocation d’assurer une protection (notamment la résistance chimique, la tenue à la corrosion) vis-à-vis des effluents agressifs transportés. Pour assurer l’adhérence entre le revêtement (époxy) et son substrat, une préparation de surface est souvent nécessaire. Parmi les procédés conventionnels, le grenaillage est la solution la plus utilisée. Simple à mettre en œuvre et d’efficacité prouvée, il permet d’assurer le décapage de la surface tout en générant une rugosité adaptée. Si la solution est approuvée, des que

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Gallovits, Chabchoub Myriam. "Oxydation d'aciers faiblement alliés et d'aciers inoxydables par plasma type Glidarc; analyse spectroscopique de la couche d'oxydes développée et du plasma." Rouen, 1996. http://www.theses.fr/1996ROUES078.

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Les propriétés oxydantes d'un plasma d'oxygène type décharge glissante et d'un plasma inductif basse pression sont testées sur des cibles métalliques d'aciers faiblement alliés (XC 38, 40 CAD 6-12) et d'aciers inoxydables (AISI 304, 310 et 430). La caractérisation des couches d'oxydes formées après traitement est réalisée par différentes méthodes : spectroscopie optique de réflexion (UV-VIS proche IR, IRFT) ; diffraction des rayons X ; spectroscopie Mössbauer et MEB-EDS. L'analyse de ces couches montre l'apparition de Fe2O3 et de Fe3O4 dans le cas des aciers faiblement alliés, de Fe2O3 et d'ox

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Graux, Nicolas. "Caractérisation et modélisation des propriétés à la fatigue à grand nombre de cycles des aciers cémentés à partir d'essais d'auto-échauffement sous sollicitations cycliques." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0104.

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Le dimensionnement en fatigue à grand nombre de cycles d'un contact roulant entre des éléments ayant subi un traitement thermochimique de cémentation s'avère rapidement complexe.D'une part le traitement de cémentation apporte une hétérogénéité de propriété dans les couches supérieures de la pièce qui dépend du protocole utilisé. D'autre part le chargement de contact roulant est un chargement complexe dont le mode de défaillance en fatigue s'initie en sous-couche.Afin de limiter le temps de la caractérisation des champs de propriétés en fatigue, l'utilisation des mesures d'auto-échauffement sou

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Harder, Sergej [Verfasser]. "Near-infrared laser surface treatment of milled CFRP aircraft structures for bonded repair applications / Sergej Harder." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/1222589230/34.

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PARVINI-AHMADI, NAGHI. "Phosphatation et tenue a la corrosion d'aciers doux galvanises et electrozingues : passivation par le titane trivalent." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13093.

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Etude de certains aspects et parametres lies au traitement de conversion par phosphatation des toles d'aciers galvanises et electrozingues: temperature, composition, ph des bains. . . Caracterisation de la couche de conversion et examen de l'influence du vieillissement du bain de degraissage et du traitement final de passivation par des solutions de ticl::(3)

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Shimizu, Yu. "Bioactive effects of strontium loading on micro/nano surface Ti6Al4V components fabricated by selective laser melting." Kyoto University, 2020. http://hdl.handle.net/2433/253206.

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Leong, Hoi San. "Effect of corrosion inhibitor and laser surface treatment on corrosion behavior of steel used in chilling system." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2550589.

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Kriebel, Mariano. "Effect of Er,Cr:YSGG and diode laser treatment on surface properties of 3Y-TZP for dental applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275049945.

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Soares, Evaldo Julio Ferreira. "Tratamento superficial a laser dos aços AISI 1045 e AISI 4340 : transformações microestruturais e propriedades." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263557.

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Orientador: Maria Clara Filippini Ierardi<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-09T12:12:23Z (GMT). No. of bitstreams: 1 Soares_EvaldoJulioFerreira_D.pdf: 5976897 bytes, checksum: 3a90757d7dedddb93e26e91797b38b52 (MD5) Previous issue date: 2005<br>Resumo: A melhoria nas propriedades superficiais dos materiais tem sido buscada incessantemente pelas indústrias de transformação. A utilização do laser para tratamento térmico e refusão, entre outros processos, tem possibilitado grandes avanços nesta área. M

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Sreekanth, Suhas. "Laser-Directed Energy Deposition : Influence of Process Parameters and Heat-Treatments." Licentiate thesis, Högskolan Väst, Avdelningen för svetsteknologi (SV), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-15767.

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Laser-Directed Energy Deposition (L-DED), an Additive Manufacturing (AM) processused for the fabrication of parts in a layer-wise approach has displayed an immense potential over the last decade. The aerospace industry stands as the primary beneficiary due to the L-DED process capability to build near-net-shape components with minimal tooling and thereby producing minimum wastage because of reduced machining. The widespread use of Alloy 718 in the aero-engine application has prompted huge research interest in the development of L-DED processing of this superalloy. AM processes are hindered by

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De, Pauw Virginie. "Mécanismes de nitruration et d'oxydation du composé intermétallique Sm2 (Fe, Co)1#7 pour aimants permanents." Rouen, 1996. http://www.theses.fr/1996ROUES053.

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L'étude des mécanismes de nitruration du composé intermétallique Sm2 (Fe, Co)1#7 est effectuée sur des échantillons massifs à l'aide de la diffraction des rayons X et de la microscopie électronique à balayage. Nous avons utilisé deux modes de nitruration (lit fluidisé et flux gazeux) afin de comparer les processus mis en jeu lors du traitement. Des comportements différents interviennent au niveau de la distribution de l'azote dans les échantillons, des cinétiques de nitruration globale et de la couche de surface. Il apparaît que la diffusion de l'azote est principalement volumique dans le cas

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Harry, Emmanuelle. "Stabilité mécanique et modes d'endommagement de revêtements multicouches à base de tungstène et de tungstène-carbone élaborés par PVD." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0071.

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Les revetements a base de tungstene et de tungstene-carbone sont utilises pour leurs proprietes de resistance a l'usure contre le frottement ou contre l'erosion par des particules solides. Ces revetements peuvent etre le siege de contraintes residuelles elevees. Seules ou associees a une sollicitation exterieure, elles peuvent etre a l'origine de nombreux mecanismes d'endommagement, alterant la fiabilite des revetements. L'objectif de notre travail est d'analyser la stabilite mecanique et les modes de rupture de ces revetements, en relation avec leurs proprietes microstructurales et mecaniques

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Girault, Marie. "Etude d'un plasma généré lors d'un traitement de surface métallique par ablation laser dans l'air : caractérisations du rayonnement et des nanoparticules induits." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS028/document.

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L’interaction d’un faisceau laser de courte durée d’impulsion sur des matériaux tels que l’aluminium, le fer ou le titane est caractérisée par la présence d’une plume très énergétique et fortement ionisée (plasma). L'objectif de cette étude est de comprendre les mécanismes mis en jeu dans le plasma, créé lors de l'interaction laser-cible, qui conduisent à la formation de nanoparticules.Nous souhaitons étudier de façon générale la dynamique d’expansion dans l’air de la plume formée par un laser Nd :YAG déclenché de courte durée d’impulsion pour préciser les conditions de formation de ces partic

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NOGUEIRA, ALESSANDRO F. "Texturização em superfícies de titânio grau 2 irradiadas com laser de pulsos ultracurtos." reponame:Repositório Institucional do IPEN, 2015. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23740.

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Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-06-11T17:54:41Z No. of bitstreams: 0<br>Made available in DSpace on 2015-06-11T17:54:41Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Wongkamhaeng, Kan. "Effect of chairside surface treatments on biaxial flexural strength and subsurface damage in monolithic zirconia for dental applications." Thesis, University of Iowa, 2016. http://ir.uiowa.edu/etd/3233.

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Objective: The goal of the present study was to investigate the effect of chairside surface treatments on biaxial flexural strength and subsurface damage of monolithic zirconia ceramics. Methods: Specimens (15x15x1.2 mm3) were prepared by sectioning from commercially available zirconia blanks (BruxZirTM) and sintering according to manufacturer's recommendations. Fully dense specimens were randomly divided into five groups (n=30) and treated as follows; 1) as-sintered (AS) 2) air abraded with 50 μm alumina fine particles (AAF), 3) air abraded with 250 μm coarse alumina particles (AAC), 4) groun

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Bobb, Julian A. "LASER SYNTHESIS OF NANOMATERIALS INCORPORATED WITHIN HIGH SURFACE AREA MATERIALS: APPLICATIONS FOR HETEROGENEOUS CATALYSIS, WATER TREATMENT, AND PHOTOTHERMAL ENERGY CONVERSION." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5693.

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Chemical methods are generally used for the synthesis of active nanoparticles (metals, semi-metals, metal oxides, and etc) supported on high surface area materials. Chemical methods involve using strong solvents, harmful gases (H2 & CO), and high temperature techniques such as high boiling solvents, calcination and pyrolysis. The main drawbacks of using this approach, is the prevalence of chemical agents on nanomaterials which tends to negate its applications. Alternatively, photochemical and photothermal methods are widely being considered for the synthesis and design of nanomaterials. For th

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Sgura, Ricardo. "Tratamento de superfície de porcelanas dentárias pela irradiação com laser de CO2." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-10092013-201616/.

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Este estudo teve como objetivo testar o laser de CO2 como um agente de tratamento de superfície de porcelanas dentárias. Material e Métodos: O estudo foi dividido em duas etapas: na primeira etapa, discos de porcelana (3,5 mm diam. x 2,0 mm espess.) das marcas VM7, VM9 e VM13 (VITA) foram sinterizados e tiveram uma de suas faces asperizadas por uma ponta diamantada 2134F para acabamento. Os espécimes foram então divididos em grupos de acordo com os seguintes tratamentos: nenhum (C), auto-glaze em forno (G) e irradiação com laser (L) de CO2 (Coherent, = 10,6 m, 35 W) de forma contínua com 40,

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Carvalho, Lisiane Rocha Azevedo de 1985. "Gradiente de rigidez na superfície de peças de Ti através da obtenção de ligas Ti-Nb por laser : Stiffness gradient Ti parts obtained by laser surface alloying with Nb." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265960.

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Orientador: João Batista Fogagnolo<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-24T20:13:02Z (GMT). No. of bitstreams: 1 Carvalho_LisianeRochaAzevedode_M.pdf: 2047962 bytes, checksum: 5f5e3ae6c55b6c8a79673f40d2fc559a (MD5) Previous issue date: 2014<br>Resumo: Titânio e suas ligas são amplamente utilizados como biomateriais devido a propriedades como alta resistência específica, alta resistência à corrosão e baixo módulo de elasticidade. As ligas de titânio apresentam diferentes estruturas cristalinas, a

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AGUIAR, AMANDA A. "Avaliação do recobrimento biomimético em compósitos de alumina-zircônia texturizadas superficialmente com laser de femtossegundo." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10203.

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Made available in DSpace on 2014-10-09T12:35:58Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:33Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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