Dissertations / Theses on the topic 'Coatings'
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Mahfoudhi, Marouen. "Numerical optimisation of electron beam physical vapor deposition coatings for arbitrarily shaped surfaces." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2225.
Full textFor the last few decades, methods to improve the engine efficiency and reduce the fuel consumption of jet engines have received increased attention. One of the solutions is to increase the operating temperature in order to increase the exhaust gas temperature, resulting in an increased engine power. However, this approach can be degrading for some engine parts such as turbine blades, which are required to operate in a very hostile environment (at ≈ 90% of their melting point temperature). Thus, an additional treatment must be carried out to protect these parts from corrosion, oxidation and erosion, as well as to maintain the substrate’s mechanical properties which can be modified by the high temperatures to which these parts are exposed. Coating, as the most known protection method, has been used for the last few decades to protect aircraft engine parts. According to Wolfe and Co-workers [1], 75% of all engine components are now coated. The most promising studies show that the thermal barrier coating (TBC) is the best adapted coating system for these high temperature applications. TBC is defined as a fine layer of material (generally ceramic or metallic material or both) directly deposited on the surface of the part In order to create a separation between the substrate and the environment to reduce the effect of the temperature aggression. However, the application of TBCs on surfaces of components presents a challenge in terms of the consistency of the thickness of the layer. This is due to the nature of the processes used to apply these coatings. It has been found that variations in the coating thickness can affect the thermodynamic performance of turbine blades as well as lead to premature damage due to higher thermal gradients in certain sections of the blade. Thus, it is necessary to optimise the thickness distribution of the coating.
Kashefi, Mehrdad. "PRIME surface coating : a novel method for making thick ceramic coatings." Thesis, Nottingham Trent University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431899.
Full textBeresnev, V. M., O. V. Sobol’, Олександр Дмитрович Погребняк, Александр Дмитриевич Погребняк, Oleksandr Dmytrovych Pohrebniak, U. S. Nyemchenko, S. S. Grankin, et al. "About Peculiarities of the Influence of the Negative Bias Potential Applied to the Substrate During the Deposition Process on the Structural State and Properties of the Multilayer system MoN-CrN." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42799.
Full textSjödin, Isak. "Cool Roof Coatings on Industrial Buildings : An Energy Study of Reflective Coatings." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-157503.
Full textOZZELLO, ELENA DANIELA. "UV-cured fouling release acrylic coatings and protective coatings for clay bricks." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2716632.
Full textBettley, Alison. "Electroplated titanium coatings." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305065.
Full textAlyamac, Elif. "Self-Stratifying Coatings." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259474985.
Full textChen, Long. "Self-Stratifying Coatings." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1376480287.
Full textBunker, Daniel Thomas. "The Influence of drying rate on the pore volume distribution of clay coatings." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/5783.
Full textPrall, Katharina. "The Viscoelastic Behavior of Pigmented Latex Coating Films." Fogler Library, University of Maine, 2000. http://www.library.umaine.edu/theses/pdf/PrallK2000.pdf.
Full textZIPPERIAN, DONALD CHARLES. "PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE ZINCATE IMMERSION PROCESS FOR ALUMINUM AND ALUMINUM ALLOYS." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184123.
Full textGraham, David W. "Corrosion resistant chemical vapor deposited coatings for SiC and Si₃N₄ /." This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020327/.
Full textJiang, Chao. "Chemical reactions in can coating systems : their relevance to the coating characteristics and the performance of can coatings." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496545.
Full textPickles, Matthew Jonathan. "Hydrodynamic erosion of coatings." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243503.
Full textMoh, Sarfaraz. "Microwave assisted sputtered coatings." Thesis, University of the West of Scotland, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556071.
Full textOki, Makanjuola. "Conversion coatings on aluminium." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390302.
Full textWalker, Dane E. "Enhanced molybdate conversion coatings." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12209.
Full textDenisov, V. N., B. N. Mavrin, E. A. Vinogradov, S. N. Polyakov, A. N. Kirichenko, K. V. Gogolinsky, A. S. Useinov, et al. "Characterization of TiAlN coatings." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20448.
Full textChakravorty, Asima. "Stable Fluorinated Antimicrobial Coatings." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/450.
Full textBrown, Robert W. "Development of a Novel Grease Resistant Functional Coatings for Paper-based Packaging and Assessment of Application by Flexographic Press." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4554/.
Full textJain, Rahul. "Investigations on Multiscale Fractal-textured Superhydrophobic and Solar Selective Coatings." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78725.
Full textMaster of Science
Bouscher, Robert F. "Advancements in Powder Coating Processing and in Real-time Film Formation Analysis of Thermoset Coatings." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627566578541715.
Full textChen, Qingyuan. "An experimental study of air entrainment in a blade coating system with a pressurised pond applicator." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/5807.
Full textDeogon, Malkit Singh. "A study of intumescent coatings." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/6297.
Full textKönig, Meike. "Functional Coatings with Polymer Brushes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-126365.
Full textRamm, David Alfred John. "Mechanics of sprayed composite coatings." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294397.
Full textEtheridge, Andrea Mary. "Conversion coatings on aluminium alloys." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307051.
Full textGardner, M. K. "Adhesion of coatings to steel." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376908.
Full textHolness, R. J. "Conducting network anti-corrosion coatings." Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637293.
Full textGeng, Kebin. "MECHANICAL EVALUATION OF NANOCOMPOSITE COATINGS." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/395.
Full textBrinley, Erik. "TUNABLE NANOSTRUCTURE ANTI-REFLECTIVE COATINGS." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3923.
Full textM.S.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science & Engr MSMSE
Sturgeon, Andrew John. "Glass-ceramic coatings for metals." Thesis, University of Warwick, 1987. http://wrap.warwick.ac.uk/34630/.
Full textHowell, Dickson. "Dynamic testing of antifouling coatings." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437978.
Full textHenderson, Philip Simon. "Durable optical coatings on glass." Thesis, University of Salford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395663.
Full textTinsley, Anne Margaret. "Surface coatings for molecular sensors." Thesis, Open University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358071.
Full textBenjamin, Susan. "Aspects of self stratifying coatings." Thesis, City University London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360786.
Full textAl-Aaraji, Mohammed. "Nanostructured ferroelectric ceramics and coatings." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/nanostructured-ferroelectric-ceramics-and-coatings(fee6c466-fce3-40f1-806a-2f26ecacdf82).html.
Full textDempster, William. "Glass coatings for automobile applications." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18131/.
Full textCloete, William Joseph. "Development of permanently antimicrobial coatings." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17945.
Full textENGLISH ABSTRACT: Water-borne coatings often contain multiple additives including pigments, dispersing agents, rheology modifiers, UV stabilizers and biocides. Due to their low molar mass and endocrinedisrupting properties, many of these additives, upon leaching from the substrate film, with time pollute water systems and become hazardous to the environment and to human health. In this study, I aimed to develop a facile method for the production of a polymeric biocide to serve as alternative to low molar mass biocides used in water-borne coatings. A secondary aim was to show that, without additional modification, the polymeric species can be used in surfactant-free ab initio emulsion polymerizations. Using a two-step process, I modified a commercially available copolymer, poly(styrene-alt-maleic anhydride) (SMA 1000), with mixed amines in order to obtain latexes with inherent antimicrobial activity. In the first step, I reacted SMA 1000 with 3-dimethylamino-1-propylamine and aqueous ammonia to confer antimicrobial activity and water-solubility to the SMA copolymer. In the second step, the copolymer was incorporated into a film-forming styrene-butyl acrylate (STY/BuA) latex. The modified SMA was incorporated into a latex in two ways: (1) post-added to the latex, and (2) used as stabilizer in emulsion polymerization. In both cases, the latex remained stable for up to 11 months, and stability was probably due to steric stabilization of the polymer particles. Antimicrobial activity of the latex film was achieved with both methods. When the modified SMA was post-added, antimicrobial activity was restricted to specific areas on the eventual polymer film, and when modified SMA was used as stabilizer, antimicrobial activity was evenly distributed throughout the polymer film. Fluorescence microscopy showed homogeneous distribution of antimicrobial activity upon inoculation in Gram positive bacteria dispersions when the modified copolymer was used as polymeric stabilizer for the synthesis of STY/BuA latexes. No antimicrobial activity against Gram negative bacteria was achieved. The homogeneous distribution of antimicrobial activity throughout the film was a result of adsorption of polymeric biocide/stabilizer to each individual latex particle. With further commercial development, high molar mass copolymers modified for antimicrobial activity may be a feasible, environmentally-friendly and healthy alternative to be used as stabilizers in emulsion polymerizations to produce water-borne coatings.
AFRIKAANSE OPSOMMING: Waterverf bestaan gewoonlik uit ‘n verskeidenheid bestandele, onder andere: pigmente, verspreiding middels, reologie modifiseerders, UV stabiliseerders en biologies aktiewe verbindings. As gevolg van die lae molêre massa en die endokrien ontwrigtende vermoë van baie van die bestandele hou hulle ‘n bedreiging in vir die omgewing in terme van waterbesoedeling en menslike gesondheid, soos hulle die film oor tyd verlaat. In hierdie studie het ek beoog om ‘n eenvoudige metode vir die vervaardiging van ‘n polimeries biologies aktiewe verbindings daar te stel om sodoende as ‘n alternatief vir die lae molêre massa biologies aktiewe verbindings, wat tans in waterverf gebruik word, te dien. ‘n Sekondêre uitkoms van die studie was om te wys dat, sonder enige adissionele omskakelings, dieselfde polimeer gebruik kan word in seep-vrye emulsie polimerisasie. Deur gebruik te maak van ‘n proses, wat uit twee stappe bestaan, het ek ‘n kommersieel beskikbare kopolimeer, poly(stireen-alt-maleinesuuranhidried) (SMA 1000), met gemengde amiene reageer om ‘n sintetiese lateks van stireen en butiel akrilaat (STY/BuA) met inherente antibakteriële aktiwiteit te verkry. In die eerste stap is SMA 1000 met 3-dimetielamien-1-propielamien en waterige ammoniak reageer om ‘n water oplosbare kopolimeer met inherente anti-bakteriële aktiwiteit te verkry. In die tweede stap is hierdie kopolimeer by ‘n sintetiese lateks gevoeg op twee maniere: (1) deur dit nadat die lateks geproduseer is by te voeg, en (2) deur die kopolimeer as stabiliseerder te gebruik in die vervaardiging van die lateks. In albei gevalle is stabiele latekse verkry vir ‘n tydperk van tot 11 maande. Die stabilisering was van steriese geaardheid. Albei die latekse het gevolglik antibakteriële eienskappe getoon. Daar was nie homogene verspreiding van die aktiwiteit in die geval waar die kopolimeer na die tyd bygevoeg is nie en het veroorsaak dat daar sekere areas van die finale film was wat geen aktiwiteit getoon het nie. Fluoresensie mikroskopie het egter homegene verspreiding van die anti-bakteriële aktiwiteit reg deur die film getoon, na inokulasie met Gram positiewe bakterië suspensies wanneer die kopolimeer as polimerisasie stabiliseerder gebruik was. Geen aktiwiteit teen Gram negatiewe bakterië was egter verkry nie. Die homogene verspreiding was as gevolg van die feit dat die kopolimeer sterk adsorbeer op elke individuele lateks partikel wanneer dit as stabiliseerder gebruik word. Verdere ontwikkeling op ‘n kommersiële basis kan daartoe lei dat polimeries biologies aktiewe verbindings as ‘n lewensvatbare en omgewingsvriendelike alternatief vir heidige stabiliseerders in emulsies vir waterverf gebruik kan word.
Seboa, Sharrief. "Polyurethane dispersions for paper coatings." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53005.
Full textENGLISH ABSTRACT: Aqueous polyurethane (PU) dispersions were synthesized for the use in paper coatings. These PUs contained a polyester polyol soft segment (content of 60-70%) and a urethane hard segment (content of 30-40%). This was followed by grafting using four different grafting agents. Triethylamine (TEA) was used as the neutralizing agent. The polyester polyol segment consisted of neopentyl glycol (NPG), adipic acid, 1,4-cyclohexane dicarboxylic acid (1,4-CHOCA) and 2-phosphonobutane-1 ,2,4- tricarboxylic acid (PSTCA), while the urethane hard segment consisted of hydrogenated 4,4-diphenylmethane diisocyanate, dimethylolproponic acid (OMPA), 3-hydroxypivalic acid (HPA) and hydroxyethylene methacrylate (HEMA). The grafting agents used were lauryl methacrylate (LMA), n-butyl methacrylate (n-SMA), methyl methacrylate (MMA) and styrene. Two different polyester polyols were synthesized, one containing 10% phosphate and the other none. The polyols were characterized in terms of their acid value, hydroxyl value and molecular mass. The PUs synthesized from the polyol containing 0% phosphate were grafted with LMA, while the phosphate-containing PUs were grafted with each of the all four grafting agents. The resulting dispersions were applied to paperboard, and then dried at a maximum temperature of 100°C. The PU-coated paperboard was characterized using the moisture vapour transmission rate (MVTR), and scanning electron microscopy (SEM) techniques. PU films (not supported by paper, stand alone) were prepared by heating the PU dispersion in Teflon holders up to 130°C for 6 hours. The dried films were then characterized by thermogravimatric analysis (TGA), differential scanning calorimetry (OSC), dynamic mechanical analysis (OMA) and Fourier transform infrared spectroscopy (FTIR). MVTR-analysis showed that the phosphated PU coatings had a minimum MVTR-value at 0% grafting, and that its overall MVTR-values were much lower than that of the non-phosphated PU coatings. SEM-analysis showed that the phosphated PU coatings had no pinholes at a maximum of 8% grafting, while the non-phosphated PU coatings showed pinholes at all levels of grafting. OMA-analysis showed that the phosphated PU samples had higher Tg's (Tg onset between O-S°C)than that of the non-phosphated PU samples (Tgonset below -SO°C).
AFRIKAANSE OPSOMMING: POLI-URETAAN DISPERSIES VIR PAPIER BEDEKKINGS Waterige poli-uretaan (PU) dispersies is gesintetiseer vir gebruik as papierbedekkings. Hierdie poli-uretane het 'n poliester poli-ol sagte segment (60-70% inhoud) en 'n uretaan harde segment (30-40% inhoud) bevat. Die poli-uretane is met vier verskillende ent-middels geêent. Trietielamien (TEA) is as neutraliseermiddel gebruik. Die poli-ester poli-ot segment het bestaan uit: neopentielglikol (NPG), adipiensuur, 1,4-sikloheksaandikarboksielssuur (1,4- SHDKS) en 2-fosfonobutaan-1 ,2,4-trikarboksielssuur (FSTKS). Die uretaan harde segment het bestaan uit: hidrogeneerde 4,4-difenielmetaandiisosianaat, dimetielpropioonsuur (DMPS), 3-hidroksipivaalsuur (HPS) en hidroksietileenmetakrilaat (HEMA). Laurielmetakrilaat (LMA), n-butielmetakrilaat (n-SMA), metielmetakrilaat (MMA) en stireen is as entmiddels gebruik. Twee verskillende poli-ester polihidroksie verbindings is gesintetiseer: een met 10% fosfaat en een met geen fosfaat, en gekarakteriseer in terme van hulle suurwaardes, hidroksiwaardes en molekulêre massas. Die PUs wat vanaf die fosfaat-bevattende poli-ol gesintetiseer is, is met LMA geêent, terwyl die fosfaat-bevattende PUs met al vier entmiddels geêent is. Papier (Eng. paperboard) is met hierdie dispersies bedek en by 100°C gedroog. Die PU-bedekte papier is gekarakteriseer in terme van vogdeurlaatbaarheidstransmissie (Eng: MVTR - the moisture vapour transmission rate), en skandeerelektonmikroskopie (SEM). PU-films wat nie deur papier gestut is nie is ook voorberei deur die verhitting van die PU dispersies in Teflon houers (130°C, 6 ure). Die droë films is daarna gekarakteriseer deur middel van termogravimetriese analise (TGA), differensiêle skandeerkalorimetrie (DSC), dinamiese meganiese analise (OMA) en Fourier-transformasie infrarooispektroskopie (FTIR). Resultate van MVTR analises het getoon dat die fosfaat-bevattende PU bedekkings 'n mimimum MVTR-waarde by 0% enting gehad het, en dat die totale MVTR waardes baie laer was as die van die nie-fosfaatbevattende bedekkings. SEM het gewys dat die fosfaat-PU bedekkings by 8% enting geen mikrogaatjies (Eng. pinholes) gehad net nie, terwyl die PU bedekings met geen fosfaat mikrogaatjies (Eng. pinholes) by alle vlakke van enting gehad het. OMA analises het getoon dat die monsters van die fosfaatbevattende PU hoër Tg waardes gehad het (Tg begin tussen 0 en 5 "C) as die nie-fosfaatbevattende PU monsters (Tg begin onder -50°C).
Vennard, Ashlene S. M. "Photocatalytic coatings for medical applications." Thesis, Ulster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625500.
Full textRhodes, Jennifer. "Fire protection of surface coatings." Thesis, University of Central Lancashire, 2012. http://clok.uclan.ac.uk/3738/.
Full textFrodelius, Jenny. "Thick and Thin Ti2AlC Coatings." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57525.
Full textTsui, Yun Cheong. "Adhesion of plasma sprayed coatings." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/283710.
Full textPopa, Gabriela. "Spray-on hybrid nanoscale coatings." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/POPA_Gabriela_2010.pdf.
Full textHybrid thin films were prepared by a modified variant of the classical Layer-by-Layer (LbL) deposition method. Inorganic coatings are deposited using the consecutive spray method, in which aqueous solutions are alternatingly sprayed for short times (less than 5 seconds). Numerous inorganic coatings were prepared this way such as calcium phosphate, calcium fluoride, calcium oxalate, silver chloride, Prussian Blue. The main target of the hybrid films comprised of calcium phosphate and Collagen is for application in the cartilage repair. “Sandwich”-like structures of these components mimic the natural articular cartilage structure. In order to obtain the hybrid film containing Collagen and calcium phosphate, we used a (PAHPSS)barrier film. The deposition of inorganic coating can also be realized using the simultaneous spraying method where both solutions (cationic and anionic solution) are sprayed simultaneously. Homogeneous on several cm2 of surface thin films are obtained in which the film thickness is controlled by spray parameters such as spraying time, solution concentration, nature of substrate to be coated
Moore, Kevin Charles. "DEPOSITION OF COATINGS ONTO NANOFIBERS." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1153749172.
Full textWang, Xiaojiang. "Polyester Based Hybrid Organic Coatings." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1340906197.
Full textGao, Tongzhai. "Anticorrosive Organic/Inorganic Hybrid Coatings." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1412775013.
Full textIzzard, Michael. "Autocatalytic deposition of composite coatings." Thesis, Aston University, 1987. http://publications.aston.ac.uk/11907/.
Full textJota, Thiago, and Thiago Jota. "Polarization Aberrations of Optical Coatings." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624138.
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