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Bibliografie tematiche / Plasma sprayed ceramics

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Letteratura scientifica selezionata sul tema "Plasma sprayed ceramics"

Autore: Grafiati

Pubblicato: 7 settembre 2024

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Articoli di riviste sul tema "Plasma sprayed ceramics"

1

Karunaratne, B. S. B., e M. H. Lewis. "Plasma-sprayed ceramic coatings for SiAlON ceramics". Journal of the European Ceramic Society 16, n. 10 (gennaio 1996): 1133–39. http://dx.doi.org/10.1016/0955-2219(96)00030-1.

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2

Belyaev, I. V., A. V. Kireev, V. E. Bazhenov, M. N. Gerke, D. A. Kochuev e A. A. Pavlov. "Effect of hot isostatic pressing on the phase composition and porosity of plasma-deposed ceramics from pure aluminum oxide". Physics and Chemistry of Materials Treatment 6 (2023): 24–30. http://dx.doi.org/10.30791/0015-3214-2023-6-24-30.

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Changes in the phase composition and porosity of plasma-sprayed Al2O3 ceramics before and after its treatment by hot isostatic pressing (HIP) were studied. The treatment was carried out using a HIP unit with a graphite resistance heater in an argon atmosphere at a temperature of 1600 °C at a gas static pressure of 200 MPa for 3 hours. The phase composition of the material was determined by quantitative phase analysis. The porosity of ceramics was determined by X-ray computed tomography. It was found that immediately after the end of plasma spraying, the ceramic material contained a set of α, γ, and δ modifications of Al2O3, which differed in density and type of crystal lattice. The total porosity of the ceramics was 18.9 vol. %. After HIP, the phase composition of the plasma-sprayed ceramics changed. The metastable phase modifications γ and δ-Al2O3 disappeared, and the stable modification α-Al2O3 occupied the entire volume of the ceramic material. The total porosity of the ceramics decreased to 9.7 vol. %. The obtained results do not coincide with the literature data, which states that HIP of pressed ceramic samples from α-Al2O3 (corundum) at a temperature of 1300 – 1350 °С and a gas-static pressure of 150 MPa for 30 minutes leads to an increase in the density of these samples to values of more than 98 % on their theoretical density i.e. up to porosity values less than 2 %. The results of this study showed that HIP of plasma-sprayed samples of ceramics from pure alumina in the more severe above-mentioned regime (temperature 1600 °С, gas-static pressure 200 MPa, holding time 3 hours), although it leads to a 2-fold decrease in the porosity of these samples compared to the initial value, but still the value of the porosity of ceramics remains more than 9 %. According to the authors, the reasons for these discrepancies can be associated with polymorphic transformations of aluminum oxide occurring in the material of plasma-sprayed ceramic samples during their heating and accompanying these transformations with changes in the density and volume of the ceramic material, which affects its porosity.

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KARUNARATNE, B. S. B., e M. H. LEWIS. "ChemInform Abstract: Plasma-Sprayed Ceramic Coatings for SiAlON Ceramics." ChemInform 27, n. 52 (4 agosto 2010): no. http://dx.doi.org/10.1002/chin.199652306.

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4

Kuroda, Kotaro, Seiji Hanagiri, Makoto Suginoshita, Hatsuo Taira, Shin-ichi Tamura, Hiroyasu Saka e Toru Imura. "Microstructural characterization of plasma-sprayed oxide ceramics." ISIJ International 29, n. 3 (1989): 234–39. http://dx.doi.org/10.2355/isijinternational.29.234.

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Vural, M., S. Zeytin e A. H. Ucisik. "Plasma-sprayed oxide ceramics on steel substrates". Surface and Coatings Technology 97, n. 1-3 (dicembre 1997): 347–54. http://dx.doi.org/10.1016/s0257-8972(97)00223-5.

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6

Wu, Chengtie, Yogambha Ramaswamy, Xuanyong Liu, Guocheng Wang e Hala Zreiqat. "Plasma-sprayed CaTiSiO 5 ceramic coating on Ti-6Al-4V with excellent bonding strength, stability and cellular bioactivity". Journal of The Royal Society Interface 6, n. 31 (29 luglio 2008): 159–68. http://dx.doi.org/10.1098/rsif.2008.0274.

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Novel Ca-Si-Ti-based sphene (CaTiSiO 5 ) ceramics possess excellent chemical stability and cytocompatibility. The aim of this study was to prepare sphene coating on titanium alloy (Ti-6Al-4V) for orthopaedic applications using the plasma spray method. The phase composition, surface and interface microstructure, coating thickness, surface roughness and bonding strength of the plasma-sprayed sphene coating were analysed using X-ray diffraction, scanning electron microscopy, atomic force microscopy and the standard mechanical testing of the American Society for Testing and Materials, respectively. The results indicated that sphene coating was obtained with a uniform and dense microstructure at the interface of the Ti-6Al-4V surface and the thickness and surface roughness of the coating were approximately 150 and 10 μm, respectively. Plasma-sprayed sphene coating on Ti-6Al-4V possessed a significantly improved bonding strength and chemical stability compared with plasma-sprayed hydroxyapatite (HAp) coating. Plasma-sprayed sphene coating supported human osteoblast-like cell (HOB) attachment and significantly enhanced HOB proliferation and differentiation compared with plasma-sprayed HAp coating and uncoated Ti-6Al-4V. Taken together, plasma-sprayed sphene coating on Ti-6Al-4V possessed excellent bonding strength, chemical stability and cellular bioactivity, indicating its potential application for orthopaedic implants.

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Herman, Herbert. "Plasma Spray Deposition Processes". MRS Bulletin 13, n. 12 (dicembre 1988): 60–67. http://dx.doi.org/10.1557/s0883769400063715.

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The concept of plasma is central to many scientific and engineering disciplines—from the design of neon advertisement lights to fusion physics. Plasmas vary from low density, slight states of ionization (outer space) to dense, thermal plasmas (for extractive metallurgy). And plasmas are prominent in a wide range of deposition processes — from nonthermal plasma-activated processes to thermal plasmas, which have features of flames and which can spray-deposit an enormous variety of materials. The latter technique, arc plasma spraying (or simply, plasma spraying) is evolving rapidly as a way to deposit thick films (>30 μm) and also freestanding forms.This article will review the technology of plasma spraying and how various scientific disciplines are contributing to both an understanding and improvement of this complex process.The plasma gun dates back to the 1950s, when it was introduced for the deposition of alloys and ceramics. Due to its high temperature flame it was quickly discovered that plasmas could be used for depositing refractory oxides as rocket nozzle liners or to fabricate missile nose cones. In the latter technique, the oxide (e.g., zirconia-based ceramics, spinel) was sprayed onto a mandrel and the deposited material was later removed as a free-standing form.The technique's versatility has attracted considerable industrial attention. Modern high performance machinery is commonly subjected to extremes of temperature and mechanical stress, to levels beyond the capabilities of present-day materials. It is becoming increasingly common to form coatings on such material surfaces to protect against high temperature corrosive media and to enhance mechanical wear and erosion resistance. Several thousand parts within an aircraft gas turbine engine have protective coatings, many of them plasma sprayed. In fact, plasma spraying has emerged as a major means to apply a wide range of materials on diverse substrates. The process can be readily carried out in air or in environmental chambers and requires very little substrate surface preparation. The rate of deposit buildup is rapid and the costs are sufficiently low to enable widening applications for an ever increasing variety of industries.

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Tomaszek, R., Z. Znamirowski, L. Pawlowski, J. Grimblot, J. Zdanowski e W. Czarczynski. "Plasma sprayed ceramics for low macroscopic field emitters". High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) 9, n. 1 (2005): 103–8. http://dx.doi.org/10.1615/hightempmatproc.v9.i1.90.

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Dwivedi, Gopal, Toshio Nakamura e Sanjay Sampath. "Controlled Introduction of Anelasticity in Plasma-Sprayed Ceramics". Journal of the American Ceramic Society 94 (1 aprile 2011): s104—s111. http://dx.doi.org/10.1111/j.1551-2916.2011.04494.x.

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Wanner, Alexander, e Ekkehard H. Lutz. "Elastic Anisotropy of Plasma-Sprayed, Free-standing Ceramics". Journal of the American Ceramic Society 81, n. 10 (21 gennaio 2005): 2706–8. http://dx.doi.org/10.1111/j.1151-2916.1998.tb02680.x.

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Più fonti

Tesi sul tema "Plasma sprayed ceramics"

1

Kadhim, Mohammed Jasim. "Laser cladding of ceramics and sealing of plasma sprayed zirconia based thermal barrier coatings". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/11288.

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Park, Hyuen Me (Mia) Park. "Numerical and experimental analysis of stress behavior of plasma-sprayed Bioglass on titanium /". Full text open access at:, 1996. http://content.ohsu.edu/u?/etd,587.

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Longchamp, Vincent. "Modélisation du comportement de céramiques projetées plasma sous choc par simulation discrète à l'échelle de la microstructure". Electronic Thesis or Diss., Paris, HESAM, 2024. http://www.theses.fr/2024HESAE018.

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Les revêtements en céramique obtenus par projection plasma (APS) ont une microstructure poreuse et micro-fissurée qui a un effet non négligeable sur les propriétés mécaniques lors d'impact de micro-débris ou de choc laser. En effet, la microstructure permet d'atténuer les ondes de compression, ce qui peut s'avérer utile pour réaliser des revêtements de protection.Dès lors, la caractérisation du lien entre la microstructure et les propriétés sous des sollicitations dynamiques, est nécessaire pour exploiter le potentiel de ces matériaux, mais la compréhension des mécanismes qui interviennent reste encore limitée.Cette thèse s’intéresse aux possibilités offertes par la méthode des éléments discrets (MED) pour modéliser, à l’échelle de la microstructure, des matériaux hétérogènes comme les céramiques projetées plasma. Une stratégie de création de domaines numériques 3D représentant la microstructure est proposée. Elle est fondée sur de l’analyse d’images volumiques obtenues par MEB-FIB : la porosité est détectée puis traitée selon son échelle, afin d’être reproduite numériquement. Des simulations sont réalisées sur les modèles pour étudier l’effet de la microstructure sur la propagation d’ondes de compression, obtenir des lois de comportement macroscopique et étudier l'endommagement induit
Ceramic coatings obtained by plasma spraying (APS) have a porous, micro-cracked microstructure that has a significant effect on mechanical properties when subjected to micro-debris impact or laser shock.The microstructure attenuates compression waves, which can be useful for protective applications.Consequently, characterization of the microstructure-properties link, under dynamic loading, is necessary to exploit the potential of these materials, but understanding of the mechanisms involved is still limited.This thesis focuses on the possibilities offered by the discrete element method (DEM) for modelling heterogeneous materials such as plasma-sprayed ceramics at the microstructure scale. A strategy for creating 3D numerical domains representing the microstructure is proposed. It is based on the analysis of volume images obtained by FIB-SEM: porosity is detected and then processed according to its scale, in order to be reproduced digitally. Simulations are carried out on the models to study the effect of the microstructure on the propagation of compression waves, to obtain macroscopic behavior laws and to study the induced damage

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Fox, A. C. "Gas permeation through plasma sprayed ceramic coatings". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599155.

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This work has addressed the gas transport rate and mechanism through plasma sprayed coatings. This is of particular interest for thermal barrier coatings (TBCs) and solid oxide fuel cell electrodes. Deposits of ZrO₂ - 8 wt% Y₂O₃, ZrO₂ - 14 wt% Y₂O₃ and A1₂O₃ have been plasma sprayed under varying conditions. Microstructural studies and density measurements have been carried out to characterise the porosity content and microcrack distribution. Crystallographic phase analysis and Young's Modulus measurements have also carried out. The gas permeability of each specimen has been measured at temperatures up to 600°C. These measurements involve a thin disc of the coating being sealed over a ceramic tube. A mass flow controller was used to set a constant gas flow rate, and the resulting pressure difference across the coating was measured once steady state had been reached. D'Arcy's Law was then used to determine the specific permeability of each specimen. Measurements were carried out on the coatings using hydrogen, oxygen and nitrogen as the permeating gases. Values of the specific permeability were of the order of 10^-16m² for zirconia coatings and 10^-17 m² for alumina coatings. These results were correlated with microstructural observations via a simple analytical model for gas permeation, based on Percolation Theory. In this model, large pores were treated as isolated cavities with connecting microcracks, predicting a high sensitivity to the density and connectivity of microcracks. Good agreement was obtained between theory and experiment in terms of the magnitude of the permeability. The oxygen flux through the top coat of a TBC has been calculated from the permeability of the coating. Published values of the diffusion coefficient have been used to calculate the oxygen flux by diffusion. These 2 transport mechanisms have been compared and gas permeation has been found to dominate over diffusion at the operating temperatures of a TBC. Oxide growth at the bond coat / top coat interface of a TBC has been shown to be controlled by diffusion through the oxide layer.

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Erickson, Lynn C. "Wear and microstructural integrity of ceramic plasma sprayed coatings". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0008/NQ38881.pdf.

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Zhao, Jian. "Modelling damage and fracture evolution in plasma sprayed ceramic coatings : effect of microstructure". Thesis, Loughborough University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421924.

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Hansel, Jason Edgar. "The Influence of Thickness on the Complex Modulus of Air Plasma Sprayed Ceramic Blend Coatings". Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1228478738.

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Gonçalves, Fernando de Almeida. "Caracterização de revestimento de titânia aplicado por aspersão térmica a plasma em liga Ti-6A1-4V para aplicação em implantes". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263529.

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Orientadores: Cecília Amélia de Carvalho Zavaglia, Carmo Roberto Pelliciari de Lima
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-20T04:15:56Z (GMT). No. of bitstreams: 1 Goncalves_FernandodeAlmeida_D.pdf: 4153645 bytes, checksum: fe7e541e43fe3f147ac65eff5bc547f0 (MD5) Previous issue date: 2012
Resumo: A necessidade de melhorar as características superficiais da liga Ti-4Al-6V usada em implantes ortopédicos, levou à pesquisas no sentido de estudar a modificação da superfície dos implantes através da deposição de revestimentos cerâmicos resistentes à corrosão, ao desgaste e biocompatíveis, por vários métodos: eletroquímica, física a vapor, eletroforética, por sol-gel, biomimética e por aspersão térmica a plasma, entre outras. A aspersão térmica a plasma é o processo mais utilizado comercialmente, pois é rápido e reprodutível. As biocerâmicas mais utilizadas para revestimento, com sucesso, são as de fosfato de cálcio (hidroxiapatita-HA, betafosfato tricálcico [o -TCP] e uma mistura dessas duas fases). A adesão dessas biocerâmicas ao tecido ósseo possuí bom desempenho é bastante discutida na literatura. A comunidade médica tem algumas restrições ao uso desses implantes metálicos revestidos por cerâmicas, com relação à interface metal-cerâmica, cuja adesão é considerada baixa. Neste trabalho foi estudado a adesão metal/cerâmica em implantes revestidos por aspersão térmica à plasma (ATP) com cerâmica, mais especificamente liga de titânio (Ti-6Al-4V) revestida com titânia (TiO2) sem e com tratamento térmico a vácuo, com o intuito de verificar uma possível melhoria nessa adesão. A cerâmica utilizada neste trabalho foi a titânia, uma vez que é uma cerâmica biocompatível e osseointegrável, que é bastante utilizada para revestir implantes. Para a execução do trabalho foram confeccionados diversos corpos de prova, os quais foram revestidos por titânia por aspersão térmica à plasma, tratados termicamente e caracterizados segundo procedimentos contidos em normas e trabalhos científicos correlacionados que norteiam o assunto proposto. Foram utilizadas as seguintes técnicas de caracterização: análise granulométrica dos pós cerâmicos, difração de raios X, verificação da porosidade, microscopia óptica e eletrônica de varredura, verificação da rugosidade das amostras. Especial ênfase foi dada aos ensaios de adesão metal-cerâmica: ensaios de adesão por tração, flexão e riscamento. Tentou-se utilizar, sem sucesso, os ensaios de microdureza para avaliar a adesão. Como resultados, verificou-se uma boa qualidade nas amostras da liga Ti-4Al-6V revestidas por titânia por aspersão térmica a plasma. Através das três técnicas de avaliação da adesão, verificou-se uma ligeira melhoria dessas características pelo tratamento térmico a vácuo, no ensaio de riscamento a carga crítica aumentou de 53N para 62N, no ensaio de tração a tensão de fratura aumentou de 10,5MPa para 17,4MPa e no ensaio de flexão a tensão de fratura aumentou de 153,3MPa para 193,1MPa. Comparando com valores encontrados na literatura, a adesão Ti-4Al-6V/TiO2 ficou superior a Ti-4Al-6V/HA nas mesmas condições de deposição
Abstract: The need to improve the surface characteristics of the alloy Ti-4Al-6V used in orthopedic implants, increase researches with the focus into the surface modification, using deposition of ceramic coatings resistant to corrosion, wear and more biocompatible by various methods: electrochemistry, physical vapor, electrophoretic, by sol-gel, biomimetics and by thermal plasma, among others. The plasma spray technique is the process more used commercially because it is fast and reproducible. The bioceramics most used for coating, are calcium phosphate (hydroxyapatite-HA, beta-tricalcium phosphate, o -TCP and a mixture of these two phases). The adhesion of these bioceramics to the bone tissue is quite discussed in literature, presenting a good performance. However, the medical community has some restrictions on the use of metal implants with ceramic coating, since the metal-ceramic interface is considered low. In this work the aim is to study the adhesion metal/ceramic-coated implants in the thermal spray plasma (ATP), using titanium alloy (Ti-6Al-4V) coated with titania (TiO2) with and without vacuum heat treatment in order to check a possible improvement this adherence. The ceramic used in this work was the titania, since it is biocompatible and bioactive, and it is quite used to coat dental implants. For the execution of the work were made several specimens, which were coated with titania by plasma thermal spray, heat treated and characterized according to procedures and standards contained in scientific papers related to guide the proposed subject. The following characterization techniques it were used: particle size analysis of ceramic powders, X-ray diffraction, analysis of the porosity, optical microscopy and scanning electron microscopy, scanning the roughness of the samples. Special emphasis was given to tests of metal-ceramic adhesion: adhesion assays for tensile, bending and scratching. Micro hardness tests carried out, however the results were not significant. The summary of this project were that this alloy present a good quality coated by titania. The methods of increase the adhesion, showed a slight improvement of these characteristics by vacuum heat treatment, the result of the scratching test showed that the critical load increase to 62N instead 53N, when analyzed the results of tensile test it also had an increase 17,4MPa instead 10,5 MPa, the bending test presented higher results 193,1MPa in contrast to 153,3MPa for the samples without treatment. Compared with values found in the literature, the adherence of Ti-4Al-6V/TiO2 was greater than Ti-4Al-6V/HA
Doutorado
Materiais e Processos de Fabricação
Doutor em Engenharia Mecânica

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Siegert, Roberto. "A novel process for the liquid feedstock plasma spray of ceramic coatings with nanostructural features". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=980671728.

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Aubignat, Emilie. "Contribution à la compréhension et à la maîtrise du procédé de projection plasma de suspensions céramiques". Thesis, Belfort-Montbéliard, 2014. http://www.theses.fr/2014BELF0238.

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La projection plasma de suspensions (SPS) est un procédé de revêtement de surface qui consiste à injecter une suspension (particules solides d’environ 1 μm ou moins, dispersées dans une phase liquide) dans un jet de plasma énergétique. Les particules sont chauffées, accélérées en direction d’un substrat, écrasées et soumises à une solidification très rapide (de l’ordre de 106 K.s-1). Couche après couche, un dépôt se forme en surface du substrat et lui apporte de nouvelles propriétés fonctionnelles. Cette variante de la projection plasma conventionnelle permet la fabrication de revêtements avec des épaisseurs plus fines de quelques dizaines de μm et une échelle microstructurale réduite, pouvant conduire à améliorer, par exemple, les performances de dureté ou de conductivité thermique des dépôts. Bien que ce procédé soit étudié depuis le milieu des années 1990 et connaisse un intérêt grandissant, les applications industrielles ne sont pas finalisées et leur développement nécessite d’être poursuivi. En effet, l’injection d’une suspension dans un jet thermique conduit à des phénomènes complexes tels que la fragmentation des gouttes de suspension ou encore l’évaporation de la phase liquide. A ce jour, ces mécanismes ne sont pas parfaitement compris et maîtrisés et méritent d’être étudiés pour comprendre les interactions de ces fines particules avec le plasma. Les travaux décrits dans ce mémoire s’intéressent au cas de la projection SPS de céramiques avec un atomiseur bi-fluide comme système d’injection. Deux matériaux ont été choisis : l’alumine, connue pour sa difficulté à être projetée conventionnellement et dont la formation de phases cristallines particulières constitue une source d’informations sur l’histoire thermique des particules, ainsi que l’yttrine, qui permet de confirmer les tendances observées pour l’alumine. Dans un premier temps, l’optimisation de l’injection de la suspension a été effectuée en travaillant sur deux axes. Le premier axe concerne la formulation des suspensions, qui a conduit à l’obtention, avec différentes phases liquides, de suspensions stables et dispersées, de propriétés parfaitement connues. De telles suspensions assurent une reproductibilité du procédé à ce niveau et limitent le bouchage du système d’injection. Le deuxième axe porte sur la conception mécanique en trois étapes d’un atomiseur pneumatique approprié au procédé SPS. Cette étude a commencé par la caractérisation d’une buse commerciale notamment par des tests d’injection de suspension dans le plasma. Les tests étant peu concluants, l’étude s’est poursuivie par la mise au point d’une nouvelle géométrie d’atomiseur inspirée du modèle commercial. Les essais ont conduit à la réalisation de cordons et de dépôts satisfaisants. Cette étude s’est terminée enfin par l’optimisation de sa géométrie grâce à la mise en évidence de l’influence de plusieurs paramètres-clé sur les caractéristiques du jet atomisé. Dans un second temps, des outils de diagnostic ont été mis en oeuvre pour mesurer la qualité de l’injection. Le jet de suspension a été caractérisé en termes de géométrie et de tailles de gouttes, respectivement par ombroscopie et diffraction laser. L’ombroscopie a été réutilisée pour l’optimisation de l’injection de la suspension dans le plasma en permettant le réglage en temps réel des pressions d’entrée de l’atomiseur. Les propriétés des particules en vol ont ensuite été étudiées grâce à des collectes de particules sur substrat et à la vélocimétrie par images de particules (PIV). Cet outil a apporté des informations complémentaires sur l’injection de la suspension. Enfin, les revêtements obtenus ont été caractérisés en termes de morphologie (MEB), taux de porosité (analyse d’images MEB et USAXS) et de phases cristallines (DRX et EBSD). Le couplage des informations obtenues entre ces différentes techniques a permis de faire ressortir le rôle de la phase liquide et de la charge massique sur la microstructure
Suspension plasma spray (SPS) is a surface coating process that consists in injecting a suspension (solid particles of about 1 μm or less, dispersed in a liquid phase) in a high-energy plasma flow. Particles are heated, accelerated towards a substrate, flattened and submitted to a rapid solidification (order of 106 K.s-1). Layer after layer, a coating is formed on the substrate surface and brings new functional properties. This variation of the conventional plasma spray process allows the manufacturing of coatings with finer thickness of few tens of μm and a reduced structural scale that can lead to improved coating properties, like hardness or thermal conductivity. Even though this process has been studied since the middle of the 1990’S and known a fast-growing interest, industrial applications are not finalized and their development needs to be pursued. Indeed, the suspension injection in a thermal jet leads to complex phenomena such as suspension droplet fragmentation or liquid phase evaporation. Up to now, these mechanisms are not perfectly understood and controlled and deserve to be further studied to understand interactions between these fine particles and the plasma. This thesis focuses on the SPS process with ceramic suspensions and a twin-fluid nozzle as injection system. Two materials were chosen: alumina, known for its difficulty to be conventionally sprayed and whose crystalline phase formation represents a source of information about particle thermal history, and also yttria, in order to confirm the tendencies observed for alumina. Firstly, the suspension injection was optimized by working on two areas. The first area concerns suspension formulation. This led to obtain, with different liquid phases, stable and dispersed suspensions, whose properties are perfectly known. Such suspensions ensure reproducibility of the process at this level and limit the risk of injection system clogging. The second area is about the three-step mechanical conception of a pneumatic atomizer, adapted to the SPS process. This study began with the characterization of a commercial nozzle, in particular by testing the suspension injection into a plasma flow. Tests being little convincing, the study was carried on with the development of a new atomizer geometry, inspired from the commercial model. Trials drove to the manufacturing of satisfying spray beads and coatings. This study was finally completed with the optimization of this new geometry by highlighting the influence of several key parameters on the atomized jet features. Secondly, diagnostic tools were implemented to qualify the injection. Suspension jet was characterized in terms of geometry and droplet sizes, using respectively shadowgraphy and laser diffraction. Shadowgraphy was used again for optimizing the suspension injection into plasma by allowing the adjustment in real time of inlet atomizer pressures. In-flight particle properties were then studied thanks to particle collection onto a substrate and particle image velocimetry (PIV). This tool also provided additional information on the suspension injection. Finally, the resulting coatings were characterized in terms of morphology (SEM), porosity rate (SEM image analysis and USAXS) and crystalline phases (DRX and EBSD). The cross-checking of the information obtained with all these techniques brought out the role of the suspension liquid phase and of the mass load on the coating microstructure. These works contributed to enhance the knowledge about the SPS process and justified the use of a twin-fluid nozzle to obtain specific microstructures of coatings, whose functional characterizations have still to be done

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Libri sul tema "Plasma sprayed ceramics"

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Hendricks, Robert C. Film and interstitial formation of metals in plasma-sprayed ceramics. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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1947-, Miller Robert A., Jacobson Nathan S e United States. National Aeronautics and Space Administration., a cura di. New generation of plasma-sprayed mullite coatings on silicon carbide. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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1947-, Miller Robert A., Jacobson Nathan S e United States. National Aeronautics and Space Administration., a cura di. New generation of plasma-sprayed mullite coatings on silicon carbide. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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1947-, Miller Robert A., Jacobson Nathan S e United States. National Aeronautics and Space Administration., a cura di. New generation of plasma-sprayed mullite coatings on silicon carbide. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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1947-, Miller Robert A., Jacobson Nathan S e United States. National Aeronautics and Space Administration., a cura di. New generation of plasma-sprayed mullite coatings on silicon carbide. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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6

United States. National Aeronautics and Space Administration., a cura di. "Plasma-sprayed refractory oxide coatings on silicon-base ceramics": Project closing report : (NCC-3-285), (project period--3/01/93-11/15/96). [Washington, DC: National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration., a cura di. "Plasma-sprayed refractory oxide coatings on silicon-base ceramics": Project closing report : (NCC-3-285), (project period--3/01/93-11/15/96). [Washington, DC: National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration., a cura di. "Plasma-sprayed refractory oxide coatings on silicon-base ceramics": Project closing report : (NCC-3-285), (project period--3/01/93-11/15/96). [Washington, DC: National Aeronautics and Space Administration, 1997.

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9

Filiaggi, Mark J. Interface characterization of the plasma sprayed ceramic coating/metal implant system. Ottawa: National Library of Canada, 1990.

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A, Miller Robert, e Lewis Research Center, a cura di. Sintering and creep behavior of plasma-sprayed zirconia and hafnia based thermal barrier coatings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Capitoli di libri sul tema "Plasma sprayed ceramics"

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Malzbender, Jürgen, Takashi Wakui, Egbert Wessel e Rolf W. Steinbrech. "Fracture Behaviour of Plasma Sprayed Thermal Barrier Coatings". In Fracture Mechanics of Ceramics, 421–35. Boston, MA: Springer US, 2005. http://dx.doi.org/10.1007/978-0-387-28920-5_34.

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Zhu, Sheng, e Bin Shi Xu. "High-Performance Ceramic Coatings Sprayed via Novel Supersonic Plasma Spraying System". In High-Performance Ceramics III, 1203–6. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1203.

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Damani, R. J. "Heat Treatment Induced Changes in Fracture Behaviour of Bulk Plasma Sprayed Alumina". In Fracture Mechanics of Ceramics, 135–49. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-4019-6_10.

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Liu, Jun Hu, Bart Blanpain e Patrick Wollants. "A XPS Study of Atmospheric Plasma Sprayed TiB₂ Coatings". In High-Performance Ceramics V, 1347–50. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1347.

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Ma, Zhuang, Fang Ji Zhou, Su Hong Cao, Fu Chi Wang e Qun Bo Fan. "Splat Formation of Plasma Sprayed Functionally Graded YSZ/NiCrCoAlY Thermal Barrier Coatings". In High-Performance Ceramics V, 1862–65. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1862.

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Damani, R. J. "Annealing Induced Changes in Fracture Behaviour of Bulk Plasma-sprayed Alumina". In Ceramics - Processing, Reliability, Tribology and Wear, 410–15. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607293.ch66.

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Chang, Chun-Liang, Chang-sing Hwang, Chun-Huang Tsai, Sheng-Fu Yang, Wei-Ja Shong, Te-Jung Daron Huang e Ming-Hsiu Wu. "Development of Plasma Sprayed Protective LSM Coating in Iner". In Advances in Solid Oxide Fuel Cells and Electronic Ceramics II, 19–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119320197.ch2.

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Ning, Cheng Yun, Ying Jun Wang, W. W. Lu, Xiao Feng Chen, Gang Wu e Na Ru Zhao. "Microstructure and Mechanical Performances of Plasma-Sprayed Functionally Gradient HA-ZrO₂-Bioglass Coatings". In High-Performance Ceramics III, 1893–98. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.1893.

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Choi, Sung R., Dongming Zhu e Robert A. Miller. "Model I, Mode II, and Mixed-Mode Fracture of Plasma-Sprayed Thermal Barrier Coatings at Ambient and Elevated Temperatures". In Fracture Mechanics of Ceramics, 451–70. Boston, MA: Springer US, 2005. http://dx.doi.org/10.1007/978-0-387-28920-5_36.

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Cai, Yuxuan, Gisele Azimi, Thomas W. Coyle e Javad Mostaghimi. "Solution Precursor Plasma Sprayed Superhydrophobic Surface". In Ceramic Transactions Series, 141–47. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119236016.ch14.

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Atti di convegni sul tema "Plasma sprayed ceramics"

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Hollis, K., e B. Bartram. "Plasma Spray Formed Yttrium Oxide Crucibles". In ITSC2006, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima e J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p1237.

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Abstract Plasma spray forming ceramic components on a mandrel provides a way of net shape forming of difficult to machine materials. In addition, the structure of plasma sprayed ceramics contains fine porosity that improves strain accommodation as compared to sintered ceramics. However, plasma spray forming causes complex stress states in materials that may lead to cracking during spraying or during separation from the mandrel. Monitoring surface temperatures by infrared videography and controlling deposit surface temperature by directed cooling can be used to minimize thermal gradients and minimize part cracking. Control of thermal stresses is also necessary for proper separation of the sprayed part from the mandrel. Details of the plasma spray forming of yttrium oxide crucibles show how temperature monitoring, directed cooling, and robot manipulation are used to produce a crack free crucible.

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Ding, C. X., X. Y. Liu e X. B. Zheng. "Developments of Plasma Sprayed Ceramic Coatings". In ITSC2001, a cura di Christopher C. Berndt, Khiam A. Khor e Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0269.

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Abstract Recent developments in the field of plasma sprayed ceramic coatings at Shanghai Institute of Ceramics (SIC) are presented. Nano-titania and nano-tungsten carbide coatings were prepared. Their structure and properties were detected. The super hard B4C coating was deposited by APS. The physical and mechanical and anti-irradiation properties of B4C were measured. Wollastonite coating was deposited and its bioactivity has been tested. The results obtained indicated that (1) nano-titania coating possessed porous structure and unique electric properties; (2) nano-WC-Co coating exhibited notable wear resistance; (3) B4C coating was excellent irradiation resistance and (4) the carbonate-containing hydroxyapatite was formed on the surface of wollastonite coating, which indicated that this coating has excellent bioactivity.

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Kara-Slimane, A., e D. Treheux. "Prebrazing of Ceramics by Plasma Spraying for Metal-Ceramic Joining". In ITSC 1998, a cura di Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1513.

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Abstract Traditionnal brazing ailoys does not wet ceramic and therefore are unusable for metal ceramic bonding. To overcome this problem, we have pre-metallized different ceramics (AI2O3, AIN, SiAION) by plasma spraying of copper on ceramics. The good wettability of AgCu or AgCuTi alloy on so-coated ceramics is explained by effect of residual oxygen at interface which favours the thermodynamic adhesion during brazing. The interface analysis showed that silver or titanium segregation occurs at ceramic surface and that, conversely, sprayed copper diffuses in the brazed joint

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Steffens, H. D., M. Brune, E. Müller e R. Dittrich. "The Manufacture of SiC Fiber Reinforced ΑI2O3 Coatings by Plasma Spraying". In ITSC 1996, a cura di C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0311.

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Abstract Oftentimes, the application of bulk ceramics and ceramic coatings is limited by their poor fracture toughness and low strength. The mechanical properties of ceramics can be significantly improved by the incorporation of fibres, whiskers or particles of high strength, like SiC. Due to the high oxygen content of commercially available SiC fibers in combination with the elevated process temperatures, the SiC decomposes during plasma spraying. Therefore commercial SiC fibres were coated for temporary oxidation protection with C, TiN or Al2O3. By different agglomeration techniques using an organic binder SiC/Al2O3 composite powders were produced. Powder mixtures consisting of coated fibres and pure alumina as well as agglomerated powders have been successfully sprayed to form deposits. Recent results of the manufacture of SiC fibre-reinforced ceramic composites by plasma spray technology are presented. The properties of the composite coatings are compared to plasma sprayed pure alumina.

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Gadow, R., A. Killinger e C. Li. "Plasma Sprayed Ceramic Coatings for Electrical Insulation on Glass Ceramic Components". In ITSC2002, a cura di C. C. Berndt e E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0213.

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Abstract This paper presents and assesses a thermal spraying process for applying electrically insulating layers on glass ceramic substrates. It reviews the crystal structure of glass and glass ceramic and explains how it influences splat morphology, phase transformation, and the properties of plasma-sprayed materials. It is observed that substrate preheating is necessary with glass ceramics as is substrate cooling; the former to promote adhesion, the latter to control residual stress. Spray parameters such as plasma power and powder feed rate also have an effect on residual stress and must be controlled as well. Paper includes a German-language abstract.

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Barrère, F., P. Layrolle, C. A. van Blitterswijk e K. de Groot. "Physical and chemical characteristics of Plasma-Sprayed and Biomimetic Apatite Coating". In Proceedings of the 12th International Symposium on Ceramics in Medicine. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291064_0030.

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Ibe, H., T. Masuda, K. Sato e N. Kato. "Characteristics of Dense AI2O3 Coating Prepared by Suspension Plasma Spraying". In ITSC2017, a cura di A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen e C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0173.

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Abstract Sintering ceramics have been widely used in industries which require electrical and mechanical properties. Thermal sprayed ceramics coatings are also applied for the industries, however the coating which has micron size pores are limited their applications due to inferior electrical and mechanical properties compared with sintering bulk. To expand thermal sprayed ceramics coating applications, dense coatings prepared by suspension plasma spraying are widely studied. Dense Al2O3 coatings are applicable to fabricating equipment for electronics devices, such as ESC. There are no reports regarding electric properties of plasma sprayed dense Al2O3 coating with different spray conditions. In this study to achieve a electric properties of dense Al2O3 coating, spray parameters such as plasma power, gas flow rate and spray distance are investigated. Suspension materials prepared with three microns Al2O3 powder are sprayed by high power suspension plasma spraying system. Spray conditions, plasma power, gas flow rate, and stand-off distance affect the coating density, crystal phase, and mechanical and electrical properties. Mechanism of coating formation by plasma spraying with fine powder suspensions will be discussed based on the findings. Al2O3 coatings obtained by the plasma spraying is applied for application to application utilizing the electrical insulation properties of such electronics devise manufacturing equipment components is proceeding.

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Hollis, Kendall J., Marla I. Peters e Brian D. Bartram. "Plasma-Sprayed Ceramic Coatings for Molten Metal Environments". In ITSC2003, a cura di Basil R. Marple e Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0153.

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Abstract Coating porosity is an important parameter to optimize for plasma-sprayed ceramics which are intended for service in molten metal environments. Too much porosity and the coatings may be infiltrated by the molten metal causing corrosive attack of the substrate or destruction of the coating upon solidification of the metal. Too little porosity and the coating may fail due to its inability to absorb thermal strains. This study describes the testing and analysis of tungsten rods coated with aluminum oxide, yttria-stabilized zirconia, yttrium oxide, and erbium oxide deposited by atmospheric plasma spraying. The samples were immersed in molten aluminum and analyzed after immersion. One of the ceramic materials used, yttrium oxide, was heat treated at 1000°C and 2000°C and analyzed by X-ray diffractography and mercury intrusion porosimetry. Slight changes in crystal structure and significant changes in porosity were observed after heat treatments.

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Jasim, K. Mohammed, D. R. F. West, W. M. Steent e R. D. Rawlings. "Laser surface sealing of plasma sprayed yttria stabilized zirconia ceramics". In ICALEO® ‘88: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1988. http://dx.doi.org/10.2351/1.5058007.

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Valente, T., C. Bartuli, G. Visconti e M. Tului. "Plasma Sprayed Ultra High Temperature Ceramics for Thermal Protection Systems". In ITSC 2000, a cura di Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0837.

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Abstract Reusable space vehicles, which must withstand re-entry into the Earth's atmosphere, require external protection systems (TPS) which are usually in the forms of rigid surface in areas of high or moderate working temperature. High heat fluxes and temperatures related to high performance hypervelocity flights also require the use of TPS materials having good oxidation and thermal shock resistance, dimensional stability, and ablation resistance. Components by these materials are usually fabricated, starting from either billets or plate stocks, by uniaxial hot pressing, and complex parts, such as low radius edges, are then obtained by electrical discharge machining technique. This article investigates an alternative fabrication technology, based on plasma spraying, to produce near net shape components. Results of experimental activities, such as optimization of plasma spraying parameters based on a DOE approach, are reported and discussed.

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