Relevant bibliographies by topics / Yttrium stabilised zirconium

Academic literature on the topic 'Yttrium stabilised zirconium'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Yttrium stabilised zirconium"

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Osipov, V. V., V. I. Solomonov, V. V. Platonov, O. A. Snigireva, M. G. Ivanov, and V. V. Lisenkov. "Laser plume spectroscopy. 2. Graphite yttrium-stabilised and zirconium oxide targets." Quantum Electronics 35, no. 7 (July 31, 2005): 633–37. http://dx.doi.org/10.1070/qe2005v035n07abeh004087.

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Hösel, T., Claas Müller, and Holger Reinecke. "Analysis of Surface Reaction Mechanisms on Electrically Non-Conductive Zirconia, Occurring within the Spark Erosion Process Chain." Key Engineering Materials 504-506 (February 2012): 1171–76. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1171.

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Electrically insulating high performance ceramics like zirconia are increasingly used for high technological applications due to their extraordinary properties. Meanwhile even the spark erosion process can be used to structure non-conductive ceramics by using an assisting electrode (AE). This conductive AE is placed on top of the work piece to enable the process. The electrical contact is sustained during the process by carbonic residua of cracked oil used as a dielectric. For an enhanced understanding of the removal mechanisms during the spark erosion process of such non-conductive ceramics, we analysed the surface of ceramic samples during the entire spark erosion process chain. In our investigation a zirconium oxide with yttrium oxide stabilisation was chosen. For this purpose X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis was performed. The XRD results showed that the zirconium oxide reacts under the presence of carbonic residua during processing into zirconium carbide. This material supports sustaining the conductivity additionally, as it is conductive itself. In a subsequent thermal cleaning step with oxide atmosphere (T = 750°C), remaining carbonic residua are oxidised and thus removed. The XRD measurements after cleaning showed that the zirconium carbide was no longer detectable. Instead a monoclinic zirconium phase was found. This shows that a reverse reaction of zirconium carbide into zirconium oxide took place. To prevent the formation of a non-stabilised monoclinic phase, the oven process was adapted to higher temperatures of 900°C with higher heating and active cooling rates of up to 10 K/s. This adjustment shows that the monoclinic phase can be supressed and the reverse reaction leads to a tetragonal zirconium oxide like the bulk material.
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WENDEL, H., H. HOLZSCHUH, H. SUHR, G. ERKER, S. DEHNICKE, and M. MENA. "THIN ZIRCONIUM DIOXIDE AND YTTRIUM OXIDE-STABILIZED ZIRCONIUM DIOXIDE FILMS PREPARED BY PLASMA-CVD." Modern Physics Letters B 04, no. 19 (October 20, 1990): 1215–25. http://dx.doi.org/10.1142/s0217984990001537.

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Thin zirconia (zirconium dioxide) films are deposited by PECVD using as precursors organometallic compounds, metal alkoxides, and metal β-diketonates. The properties of the films depend on the substrate temperature, power density and the nature and partial pressure of the precursor. Thin films of zirconia stabilized with yttria (yttrium oxide) are formed at relatively low deposition temperatures (500°C) using the β-diketones of zirconium and yttrium.
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Kumproa, Kanatip, Apinon Nuntiya, Qi Wu Zhang, and Fumio Saito. "Synthesis of 8 %mol Yttria-Stabilized Zirconia Powders by Mechanochemical Processing of ZrOCl2.8H2O and YCl3.6H20 with Li2CO3." Advanced Materials Research 93-94 (January 2010): 344–49. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.344.

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Mechanochemical processing of zirconium oxychloride and yttrium chloride precursors with lithium carbonate has been used to synthesis ultrafine powders of yttria-stabilized zirconia. The purposes of this work are to synthesis 8% mol yttria-stabilized zirconia powder via a mechanochemical process and to study the effect of LiCl as an inert diluent on agglomerate size of ultrafine powders. 8% mol yttria-stabilized zirconia powder was prepared from zirconium oxychloride and 8 %mol yttrium chloride precursors with lithium carbonate by using planetary ball mill and heat treatment. Chemical reaction between reactant mixtures occurs during post-milling heat treatment at low temperature to form composite powder. The products of this reaction consist of ultrafine powders embedded within LiCl as soluble salt by-product. The ultrafine powder is then recovered by removing the salt through a washing procedure. The powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and particle size analysis. The results indicated that 8% mol yttria-stabilized zirconia crystal structure depends on post-milling heat treatment temperatures. The structure of yttria-stabilized zirconia is transformed to a tetragonal form at 400 oC and 500 oC. Furthermore, it tends to form a cubic structure at 600 oC. However, agglomerate size of ultrafine powders also depends on the concentration of lithium chloride as an inert diluent and the washing procedure. Primary particle size of ultrafine powders is 30 nm.
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Wang, Xin M., and Ping Xiao. "Solvothermal synthesis of zirconia and yttria-stabilized zirconia nanocrystalline particles." Journal of Materials Research 22, no. 1 (January 2007): 46–55. http://dx.doi.org/10.1557/jmr.2007.0012.

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A solvothermal method was used to prepare zirconia and yttria-stabilized zirconia (YSZ) particles using zirconium hydroxide and yttrium hydroxide particles as precursors and ethanol or isopropanol as reaction media. The particle properties were characterized with x-ray diffractometry, scanning electron microscopy, transmission electron microscopy, thermal analysis, laser particle-size analysis, nitrogen adsorption (Brunauer–Emmett–Teller method) and Zeta potential analysis. Cubic/tetragonal ZrO2 and YSZ nanocrystals with crystallite size around 5 nm were obtained. The effect of different hydroxide precursors, attrition milling of hydroxide precursors, solvothermal processing conditions, and mineralizer was investigated and discussed by referring to the crystallization process of zirconium hydroxides.
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Melikhova, Oksana, Jan Kuriplach, Jakub Čížek, Ivan Procházka, and Gerhard Brauer. "Structure and Positron Characteristics of Basic Open Volume Defects in Zirconia." Materials Science Forum 607 (November 2008): 125–27. http://dx.doi.org/10.4028/www.scientific.net/msf.607.125.

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In this contribution we report on the theoretical study of basic vacancy-like defects in cubic zirconia and yttria stabilized zirconia. In particular, we concentrate on oxygen vacancy, zirconium vacancy and oxygen vacancy – yttrium complex. Relaxed atomic configurations of studied defects are obtained by means of an ab initio pseudopotential method within the supercell approach. Positron characteristics, like positron lifetime and binding energy to defects, are calculated using self-consistent electron densities and potentials taken from ab initio calculations.
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Rodaev, Vyacheslav V., Svetlana S. Razlivalova, Alexander I. Tyurin, Andrey O. Zhigachev, and Yuri I. Golovin. "Microstructure and Phase Composition of Yttria-Stabilized Zirconia Nanofibers Prepared by High-Temperature Calcination of Electrospun Zirconium Acetylacetonate/Yttrium Nitrate/Polyacrylonitrile Fibers." Fibers 7, no. 10 (September 25, 2019): 82. http://dx.doi.org/10.3390/fib7100082.

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For the first time, dense nanofibers of yttria-stabilized tetragonal zirconia with diameter of ca. 140 nm were prepared by calcination of electrospun zirconium acetylacetonate/yttrium nitrate/polyacrylonitrile fibers at 1100–1300 °C. Ceramic filaments were characterized by scanning electron microscopy, X-ray diffractometry, and nitrogen adsorption. With a rise in the calcination temperature from 1100 to 1300 °C, the fine-grain structure of the nanofibers transformed to coarse-grain ones with the grain size equal to the fiber diameter. It was revealed that fully tetragonal nanofibrous zirconia may be obtained at Y2O3 concentrations in the range of 2–3 mol% at all used calcination temperatures. The addition of 2–3 mol% yttria to zirconia inhibited ZrO2 grain growth, preventing nanofibers’ destruction at high calcination temperatures. Synthesized well-sintered, non-porous, yttria-stabilized tetragonal zirconia nanofibers can be considered as a promising material for composites’ reinforcement, including composites with ceramic matrix.
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Wewman, R. A. "Measurement of the Phase Composition of Partially Stabilized Zirconia (PSZ) Test Parts by X-Ray Powder Diffraction." Advances in X-ray Analysis 33 (1989): 467–74. http://dx.doi.org/10.1154/s0376030800019893.

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Zirconia(ZrO2) is one of a number of ceramic materials under development both at Dow and other companies for high cost, low-volume applications under severe corrosion/wear conditions. To improve the physical properties of zirconia, much work has been done worldwide in recent years developing partially stabilized zirconia, or PSZ. This is zirconium oxide which has been “stabilized” in the tetragonal form, typically by the addition of calcium or yttrium oxide. The term “partially stabilized” is given to these materials because the proper amount of oxide stabilizer will cause the zirconia to crystallize almost entirely in the tetragonal form under the proper processing conditions. However, the PSZ fabricated part is not completely stabilized, because it will undergo a tetragonal to monoclinic (T → M) phase transformation when subjected to an applied stress.
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Falcade, Tiago, Giselle Barbosa de Oliveira, Diego Pereira Tarragó, Vânia Caldas de Sousa, and Célia de Fraga Malfatti. "Influence of Substrate Temperature in the Morphology and Microstructure of YSZ Films Obtained on LSM Porous Substrate via Spray Pyrolysis." Materials Science Forum 727-728 (August 2012): 691–96. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.691.

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Many studies have been reported in the literature related to YSZ films deposited on dense substrate or applied directly on the SOFC anode. However, there are not a lot of studies about the YSZ deposition on the cathode. The present work aims to obtain yttria-stabilized zirconia (YSZ), using the spray pyrolysis technique, for their application as electrolyte in solid oxide fuel cells (SOFC). The films were obtained from a precursor solution containing zirconium and yttrium salts, dissolved in ethanol and propylene glycol (1:1), this solution was sprayed onto a heated LSM porous substrate. The substrate temperature was varied in order to obtain dense and homogeneous films. After deposition, the films were heat treated, aiming to crystallize and stabilize the zirconia cubic phase. The films were characterized by Scanning Electron Microscopy (SEM), thermal analysis, X-ray diffraction and Fourier transform Infrared Spectroscopy (FT-IR).
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Lazar, Dolores Ribeiro Ricci, Sandra Maria Cunha, Valter Ussui, E. Fancio, Nelson Batista de Lima, and Ana Helena A. Bressiani. "Influence of Synthesis Route on Phase Formation and Sinterability of Hydroxyapatite-Zirconia Composites." Materials Science Forum 591-593 (August 2008): 722–27. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.722.

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Reinforcement with yttria stabilized zirconia (YSZ) is an alternative to improve mechanical strength of hydroxyapatite (HAp) ceramic. However, calcium may react with zirconium to form calcium zirconate. In addition, decomposition of HAp to tricalcium phosphate (TCP) occurs with water loss inhibiting ceramic densification. In order to minimize the formation of these compounds, two synthesis routes were compared in this work: coprecipitation of hydrous yttria stabilized zirconia in a calcium phosphate gel medium and powder mixture of individual calcined powders. Composite nominal compositions were fixed at 90 and 95 HAp wt%. Calcium, zirconium and yttrium chlorides and ammonium hydrogen phosphate were the employed precursors. Ammonium hydroxide was the selected precipitation agent. Calcination was performed at 800oC for 1 hour and pellets were sintered in the range of 1150 and 1350oC for 1, 3 and 5 hours. Ceramic samples were characterized by scanning electron microscopy and apparent density measurements. Crystalline phases were quantified by Rietveld analysis of X-ray diffraction patterns. Results indicate that powders prepared by coprecipitation can cause porosity formation due to the higher chemical reactivity during synthesis process.
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Dissertations / Theses on the topic "Yttrium stabilised zirconium"

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Nguyen, Ty, and ty nguyen@csiro au. "Preparation, Characterisation and Cell Testing of Gadolinium Doped Cerium Electrolyte Thin Films for Solid Oxide Fuel Cell Applications." RMIT University. Electrical and Computer Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081030.110755.

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Solid Oxide Fuel Cells (SOFCs) are devices that directly convert chemical energy into electrical energy, without proceeding through a Carnot combustion cycle. These devices are based on the usage of solid oxide electrolytes operating at relatively elevated temperatures. Two major hurdles must be overcome in order to decrease the operating temperatures of practical SOFCs. The first relates to reducing ohmic losses within solid electrolytes. The second relates to the need for developing high performance electrodes since electrolyte reaction rates at both anode and cathode are affected detrimentally as operating temperatures fall. This PhD project has focussed on addressing the first hurdle in two innovative ways: 1. the implementation of solid electrolytes with higher ionic conductivity than zirconia, 2. the development of very thin film electrolytes as thick as 5ƒÝm. Several thin films with novel electrode-electrolyte structures were fabricated and evaluated in order to demonstrate the viability of low temperature SOFC operations. Development of such thin films was innovative and challenging to achieve. The approach taken in this work involved fabricating a dense and thin gadolinia doped ceria (10GDC - Gd 10wt%, Ce 90wt%) oxide electrolyte. 10GDC is an electrolyte exhibiting higher conductivities than conventional materials during low temperature operations. A research contribution of this PhD was the demonstration of the deposition of 10GDC thin films using RF magnetron sputtering for the first time. 10GDC thin film electrolytes with thickness in a range between 0.1 to 5ƒÝm were fabricated on 10 yttrium stabilised zirconium (10YSZ) substrates by using a RF magnetron sputterer. The primary parameters controlling 10GDC thin film deposition using this method were explored in order to identify optimal conditions. The fabricated films were subsequently analysed for their morphology, composition and stoichiometry using a variety of methods, including Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectrometry (EDS), optical microscopy, X-ray Photoelectron Spectroscopy (XPS), and X-ray Diffraction (XRD). A preliminary test was conducted in order to examine the function of 10GDC thin film electrolytes together with the cathode and anode substrates at intermediate temperatures (700oC). A complete planar single cell was designed and assembled for this purpose. However, when fully assembled and tested, the cell failed to generate any voltage or current. Consequently, the remainder of the PhD work was focused on systematically exploring the factors contributing to the assembled fuel cell failure. As fabrication failure analysis is seldom reported in the scientific literature, this analysis represents a significant scientific contribution. This analysis proceeded in a series of steps that involved several different methods, including SEM, red dye analysis, surface morphology and cross section analysis of the cell. It was found that pinholes and cracks were present during the fuel cell operating test. Cathode delamination was also found to have occurred during the test operation. This was determined to be due to thermal expansion mismatch between the cathode substrate and the 10GDC electrolyte thin film. A series of suggestions for future research are presented in the conclusion of this work.
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Cooper, C. S. "Computational modelling of yttrium stabilised zirconia in catalysis." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1431123/.

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This thesis employs a range of computational modelling techniques to explore the structure, properties and catalytic activity of yttrium stabilised zirconia (YSZ) with a focus on its functions as a catalyst in methane reforming by partial oxidation. The surface and bulk properties of the material are explored, including the use of an exhaustive search of all possible defect configurations at a low yttrium loading in a bulk and a surface system allowing conclusions to be drawn about the relationship between defect configurations and stability. One significant property of YSZ materials is their ability to become oxygen ionic conductors at high temperatures, which is crucial to their use in solid oxide fuel cells and may be significant in catalytic applications. This thesis presents results of calculations designed to explore the effects of surfaces and defects on the ionic conductivity of YSZ materials, presenting evidence that oxygen conduction may be significantly enhanced at the surfaces of the material. Calculations using electronic structure techniques are carried out to examine the catalytic properties of YSZ. Initially potential surface active sites are characterised. The surface model is then shown to strongly adsorb and activate molecular oxygen, carbon dioxide and water from the gas phase. The energetics and electron movements in these surface interactions are described. These results provide the basis for investigations of reforming reactions in subsequent chapters and will be of interest in investigations of other catalytic processes over YSZ materials. A novel mechanism of methane C-H bond activation is reported over YSZ, activated by the presence of an adsorbed partially reduced O2 species. The mechanism is investigated in detail, including the use of two electronic structure techniques to allow mechanistic details to be proposed and activation energy estimated. It may be that this mechanism is more generally applicable to oxidative C – H bond activation over many metal oxide materials.
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McClellan, Kenneth James. "Structure/property relations in yttrium oxide-stabilized cubic zirconium oxide single crystals." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1061395556.

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Holz, Laura Isabel Vilas. "Yttria-stabilized Zirconia with beige colour." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21874.

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Mestrado em Engenharia de Materiais
A Zircónia é um cerâmico avançado que se tem destacado como um material versátil e promissor, apresentando uma combinação interessante de propriedades térmicas, elétricas, óticas e mecânicas, pouco comuns nos materiais cerâmicos, sendo por isso utilizada em diversas aplicações. A empresa INNOVNANO produz pós de Zircónia com diferentes características e atualmente tem clientes interessados em cerâmicos à base de Zircónia estabilizada com ítria de coloração bege com propriedades mecânicas específicas. Assim, o trabalho realizado neste estágio pretendeu desenvolver um material que cumpra os requisitos solicitados, tendo como referência uma amostra cedida por um cliente da INNOVNANO cuja cor se pretendia reproduzir, mas cuja composição e processamento eram desconhecidos. Deste modo, o trabalho teve início com a caracterização da amostra de referência através de Microscopia Eletrónica de Varrimento, Difração de raios X, espectroscopia de Raman, Fotoluminescência e Refletância Difusa de modo a permitir compreender o mecanismo de coloração, o qual mostrou ser baseado em defeitos estruturais, desenvolvidos em condições redutoras. A introdução de defeitos extrínsecos pela dopagem com óxido de ferro (Fe2O3) na matriz da Zircónia estabilizada com 2 mol % de ítria (2YSZ) foi a alternativa selecionada para a reprodução da cor solicitada. As amostras foram estudadas do ponto de vista microestrutural, estrutural e ótico. A dopagem com óxido de ferro revelou ser um mecanismo de coloração adequado, reprodutível e irreversível, permitindo o desenvolvimento de um material cromaticamente estável no que concerne à sua utilização em diferentes condições de processamento, tais como diferentes atmosferas e intervalos de temperatura. A estabilidade da cor foi confirmada com tratamentos térmicos em atmosferas oxidantes e redutoras. O efeito da adição do dopante nas propriedades mecânicas da Zircónia foi estudado, avaliando-se a tenacidade à fratura (KIC), a dureza de Vickers (HV10) e a resistência à flexão (σflexural) em amostras com elevado teor de Zircónia tetragonal ( >92 %) e com elevada densidade relativa ( >96%). Os materiais desenvolvidos preenchem os requisitos previamente definidos pela INNOVNANO, tendo-se observado, contudo, um ligeiro decréscimo da tenacidade à fratura com a adição de dopante. Já a dureza Vickers e a resistência à flexão não foram significativamente afetadas pela adição de Fe2O3.
Zirconia is a very versatile advanced ceramic that offers an interesting combination of thermal, chemical, electrical, mechanical and optical properties which are uncommon to find in ceramic materials and therefore is used in several applications. INNOVNANO is one of the main Zirconia powders suppliers in the market with potential clients for beige YSZ ceramics with specific mechanical properties. Thus, the work performed during this internship aimed to develop a material that meets the requested requirements, having as reference a sample provided by an INNOVNANO’s client which colour was intended to be reproduced but which composition and processing were unknown. In this way, the work began with reference material characterization through Scanning Electron Microscopy, X-ray Diffraction, Raman Spectroscopy, Photoluminescence and Diffuse Reflectance in order to understand the colouring mechanism, which was shown to be based on structural defects developed under reducing conditions. The introduction of extrinsic defects by doping with iron oxide (Fe2O3) in the matrix of 2 mol % yttria-stabilized Zirconia (2YSZ) was the alternative selected for the reproduction of the requested colour. The samples were studied from the microstructural, structural and optical point of view. Doping with iron oxide has proved to be a suitable, reproducible and irreversible colouring mechanism allowing the development of a chromatically stable material with respect to its use in different processing conditions such as different atmospheres and temperature ranges. Colour stability was proved by thermal treatments in oxidizing and reducing atmospheres. The effect of dopant addition on the mechanical properties of Zirconia was studied by evaluating the fracture toughness (KIC), Vickers hardness (HV10) and flexural strength (σflexural) in samples with high tetragonal Zirconia content (> 92%) and high relative density (> 96%). The developed material fulfils the requirements previously defined by INNOVNANO, but a slight decrease of the fracture toughness with the addition of dopant was observed while Vickers hardness and flexural strength were not significantly affected by the addition of Fe2O3.
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Sondhi, Anchal. "Investigations in the Mechanism of Carbothermal Reduction of Yttria Stabilized Zirconia for Ultra-high Temperature Ceramics Application and Its Influence on Yttria Contained in It." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500159/.

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Zirconium carbide (ZrC) is a high modulus ceramic with an ultra-high melting temperature and, consequently, is capable of withstanding extreme environments. Carbon-carbon composites (CCCs) are important structural materials in future hypersonic aircraft; however, these materials may be susceptible to degradation when exposed to elevated temperatures during extreme velocities. At speeds of exceeding Mach 5, intense heating of leading edges of the aircraft triggers rapid oxidation of carbon in CCCs resulting in degradation of the structure and probable failure. Environmental/thermal barrier coatings (EBC/TBC) are employed to protect airfoil structures from extreme conditions. Yttria stabilized zirconia (YSZ) is a well-known EBC/TBC material currently used to protect metallic turbine blades and other aerospace structures. In this work, 3 mol% YSZ has been studied as a potential EBC/TBC on CCCs. However, YSZ is an oxygen conductor and may not sufficiently slow the oxidation of the underlying CCC. Under appropriate conditions, ZrC can form at the interface between CCC and YSZ. Because ZrC is a poor oxygen ion conductor in addition to its stability at high temperatures, it can reduce the oxygen transport to the CCC and thus increase the service lifetime of the structure. This dissertation investigates the thermodynamics and kinetics of the YSZ/ZrC/CCC system and the resulting structural changes across multiple size scales. A series of experiments were conducted to understand the mechanisms and species involved in the carbothermal reduction of ZrO2 to form ZrC. 3 mol% YSZ and graphite powders were uniaxially pressed into pellets and reacted in a graphite (C) furnace. Rietveld x-ray diffraction phase quantification determined that greater fractions of ZrC were formed when carbon was the majority mobile species. These results were validated by modeling the process thermochemically and were confirmed with additional experiments. Measurements were conducted to examine the effect of carbothermal reduction on the bond lengths in YSZ and ZrC. Subsequent extended x-ray absorption fine structure (EXAFS) measurements and calculations showed Zr-O, Zr-C and Zr-Zr bond lengths to be unchanged after carbothermal reduction. Energy dispersive spectroscopy (EDS) line scan and mapping were carried out on carbothermaly reduced 3 mol% YSZ and 10 mol% YSZ powders. Results revealed Y2O3 stabilizer forming agglomerates with a very low solubility in ZrC.
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Kilo, Martin, and Robert A. Jackson. "Oxygen transport and association in yttria stabilised zirconia." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-195369.

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Kilo, Martin, and Robert A. Jackson. "Oxygen transport and association in yttria stabilised zirconia." Diffusion fundamentals 2 (2005) 23, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14353.

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Wei, Chiao-Chien. "Yttria stabilised zirconia (YSZ) membranes and their applications." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/4345.

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1 Abstract The development of ceramic hollow-fibre membranes has gradually grown in the past decade. This specific geometry which has a high surface area per unit volume can dramatically increase the efficiency of separation processes and can be adapted to a variety of industrial applications. In addition, ceramic membranes are well known for their superior chemical and thermal stability which allows them to operate at high temperatures and/or in chemically harsh environments. Nevertheless, the main challenge for their industrial application is their insufficient mechanical strength. Yttria-stabilized zirconia (YSZ) is selected as a membrane material in this study. This is because the material has superior mechanical strength and it is relatively cheaper than other ceramic materials. The ionic conducting property of YSZ material is also a benefit when it is used in electrochemical applications. Porous and dense YSZ hollow-fibre membranes have been developed in the study using a combined phase inversion and sintering process. Different membrane morphologies, surface properties, mechanical strength and porosity could be achieved by controlling the YSZ content and sintering temperature. The developed YSZ hollow-fibre membranes with porous or dense structures show great potential for a variety of applications. Porous YSZ hollow-fibre membranes can be used as membrane contactors in aqueous media or for fluid separations in harsh environments, which most polymeric membranes cannot withstand. For the application of membrane contactors in aqueous media, the nature of the YSZ membranes must be modified from hydrophilic to hydrophobic in order to keep them non-wetted during the aqueous contacting processes. A robust and hydrophobic YSZ hollow-fibre membrane was developed by introducing a pretreatment technique, followed by a grafting procedure. The hydrophobic YSZ membrane was found to be thermally stable up to 270 °C and chemically stable in hexane for 100 h. This membrane was then applied to the absorption of carbon dioxide from a high concentration aqueous ethanolamine solution. The results demonstrated the high efficiency of the ceramic hollow-fibre membrane contactor compared to traditional devices. Dense YSZ hollow-fibre membranes with outer diameters of 1.28 mm have been used as an electrolyte support in a solid oxide fuel cell. The YSZ electrolyte-supported SOFC was prepared at relatively lower sintering temperatures and shorter sintering durations. The YSZ-based hollow fibre SOFC demonstrated its ionic stability in a redox environment and mechanical stability at temperatures up to 800 °C. The results also demonstrated its electrochemical performance at high temperature. In summary, this thesis focuses on the development of YSZ hollow-fibre membranes from the initial step of fabricating the membrane to the final step of their potential application. Different structures of YSZ hollow-fibre membranes were studied, discussed and their potential performance was compared to the achievements of others in order to gain more understanding and information on the use of the membranes for practical applications.
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Clifton, Andrew Charles. "Novel processing of nanostructured yttria-stabilized zirconia." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1438928.

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Pietrowski, Marek J., Souza Roger A. De, Umberto Anselmi-Tamburini, Sangtae Kim, Zuhair A. Munir, and Manfred Martin. "Oxygen diffusion in nanocrystalline yttria-stabilized zirconia." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-186906.

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Books on the topic "Yttrium stabilised zirconium"

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Ali, M. El Sayed. Effect of cutting on fracture strength of yttria partially stabilized zirconia. Roskilde: Riso National Laboratory, 1988.

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Bansal, Narottam P. Processing of alumina-toughened zirconia composites. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Bansal, Narottam P. Processing of alumina-toughened zirconia composites. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Bansal, Narottam P. Processing of alumina-toughened zirconia composites. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Bansal, Narottam P. Processing of alumina-toughened zirconia composites. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Miller, Robert A. Characterization and durability testing of plasma-sprayed zirconia-yttria and hafnia-yttria thermal barrier coatings. Part 1-Effect of spray parameters on the performance of several lots of partially stabilized zirconia-yttria powder. Cleveland, Ohio: Lewis Research Center, 1993.

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Albrecht, Cornelia D. An investigation of plasma sprayed fully yttria stabilized zirconia in thick thermal barrier coatings. Manchester: UMIST, 1997.

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Moussa, Mohamed A. A. Fabrication and characterisation of Nd-123 high-temperature superconducting thick films on yttria stabilized zirconia substrates. Birmingham: University of Birmingham, 2003.

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Krestos, Dean M. An X-ray diffraction investigation of *-A10 addition to yttria stabilized zirconia (YSZ) thermal barrier coatings subject to destabilizing vanadium pentoxide (V0*) exposure. Monterey, Calif: Naval Postgraduate School, 1993.

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Controlled-Stress Large-Area Pulsed Laser Deposition of Yttria Stabilized Zirconia. Storming Media, 2003.

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Book chapters on the topic "Yttrium stabilised zirconium"

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Lu, Zheng Lan, Dan Yu Jiang, Lei Hu, Guo Qiang Zhu, Qiang Li, and Cheng Zhang. "Low Temperature Degradation of Yttria Stabilized Zirconia." In Key Engineering Materials, 1188–89. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1188.

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Wang, Jun, and Hans Conrad. "Grain Boundary Resistivity in Yttria-Stabilized Zirconia." In Ceramic Transactions Series, 175–88. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118744109.ch20.

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Gratz, E., S. Pati, J. Milshtein, A. Powell, and U. Pal. "Control of Yttrium Diffusion out of Yttria Stabilized Zirconia during SOM Electrolysis for Magnesium Production." In Magnesium Technology 2012, 499–503. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48203-3_89.

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Gratz, E., S. Pati, J. Milshtein, A. Powell, and U. Pal. "Control of Yttrium Diffusion Out of Yttria Stabilized Zirconia During SOM Electrolysis for Magnesium Production." In Magnesium Technology 2012, 499–503. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359228.ch91.

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Xu, P., J. Mostaghimi, T. W. Coyle, and L. Pershin. "Suspension Plasma Spray of Yttria Stabilized Zirconia Coatings." In Ceramic Transactions Series, 451–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch42.

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Sakuma, T. "Evolution of Microstructure in Yttria Partially-Stabilized Zirconia." In Sintering ’87, 1149–54. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_193.

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Belova, Irina V., Graeme E. Murch, D. Samuelis, and M. Martin. "Contribution to the Theory of Demixing of Yttrium in Yttria-Stabilized-Zirconia in an Electric Field." In Mass and Charge Transport in Inorganic Materials III, 42–47. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-02-8.42.

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Gómez, Sergio Y., Farshad Farzan, Ricardo H. C. Castro, and Dachamir Hotza. "Modeling Densification during Fast Firing of Yttria-Stabilized Zirconia." In Processing, Properties, and Design of Advanced Ceramics and Composites: Ceramic Transactions, 153–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119323303.ch13.

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Backhaus-Ricoult, Monika, Michael Badding, and Yves Thibault. "Grain Boundary Segregation and Conductivity in Yttria-Stabilized Zirconia." In Ceramic Transactions Series, 173–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407899.ch20.

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Fassina, P., N. Zaghini, A. Bukat, C. Piconi, F. Greco, and S. Piantelli. "Yttria and Calcia Partially Stabilized Zirconia for Biomedical Applications." In Bioceramics and the Human Body, 223–29. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2896-4_29.

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Conference papers on the topic "Yttrium stabilised zirconium"

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Barrier, D., A. A. Bukaemskiy, K. S. Soe, M. M. Titov, and G. Modolo. "Fixation of Actinides in Zirkonium Based Ceramics." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4813.

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In recent years, various fuel types or targets, free from U-238, have been proposed for the transmutation of plutonium and the minor actinides. Yttrium-stabilised zirconia is currently under investigation because of its small neutron cross section and is high solubility with PuO2 and AmO2. The aim of the present work is to investigate the behaviour of Yttrium Stabilised Zirconium Oxide in presence of Cerium, as simulate of minor actinides. Several oxide materials composed of Zr, Y, Ce (5–25%), have been synthesised by coprecipitation method at different calcination temperature and the products have been characterised by Optical Microscopy (OM), Thermogravimetry (TG) coupled with Thermal Differential Analysis (DTA), X-ray Line Diffraction (XRD), Scanning Electron Microscopy (SEM) Energy Dispersive X-Ray analyser (EDX) etc. The investigations show that, the structure of the powder, characterised by the phase condition, the lattice parameter, the crystalline size and the lattice distorsion, varies with the CeO2 content, and has an influence on the sinterability. “Mild” methods of powder preparation (drying, low-temperature calcination, wet grinding by attrition) were used before sintering. For all investigated Cerium concentrations, the optimal parameter of pressing and sintering were determined. For a wide Cerium concentration region, from 5 to 20 wt%, the density of compact materials is 92–95% of TD, the microhardness 13.5 GPa and the pellets have a good morphology, grains and pores being homogeneous distributed in material.
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Kodiyalam, Sanjay, Michael Benissan, Stephen Akwaboa, Patrick F. Mensah, Amitava Jana, and Diola Bagayoko. "Parallel Molecular Dynamics Simulations and Immersive Visualization of Thermal Barrier Coating Components: Thermally Growing Oxide and Yttria Stabilized Zirconia." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66625.

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Non-equilibrium parallel molecular dynamics simulation is used to determine the thermal conductivity of Alumina in the [2 1 1 0]direction at 1200 K: When thermal expansion is not allowed it is found to be 3.45 W/mK, while with thermal expansion it is 2.95 W/mK. A short ranged empirical potential for Yttria stabilized Zirconia (YSZ) is developed by fitting to available ab initio and experimentally derived data for Zirconia. With this potential, simulations of YSZ at 2073.16 K, with 4.9–23.1 mol% of Yttria in Zirconia, shows diffusing Oxygen and non-diffusing Zirconium and Yttrium atoms as expected. However, the diffusion constant of oxygen increases with the Yttria content, inconsistent with simulations with long range interactions showing a peak around 10 mol% of Yttria and also inconsistent experiment at 923 K. Visualizing the dynamics of atoms in Alumina, when driven by a heat-current forcing perturbation, shows phonon-like modes indicating the need for smaller perturbation or an alternate method to determine thermal properties.
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Alperine, S., and L. Lelait. "Microstructural Investigations of Plasma Sprayed Yttria Partially Stabilized Zirconia TBC: in Relation to Thermomechanical Resistance and High Temperature Oxidation Mechanisms." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-317.

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This study deals with microstructural investigations of plasma sprayed yttria partially stabilized zirconia thermal barrier coatings, performed by classical and analytical transmission electron microscopy. The aim of the study was to determine eventual relationships between coating microstructure and toughness. The ceramic/metal interface which plays an important role during TBC thermomechanical sollicitation, has also been studied. In the 6 to 8 weight % Y2O3 range, the metastable tetragonal t’ phase is observed, showing special faulted microstructural features, such as grain twinning and antiphase boundary planes. Moreover, after high temperature annealing in air, a very fine and stable precipitation of the equilibrium cubic phase appears. It is believed that these microstructural elements could act as crack deviation sites and enhance coatings intrinsic toughness. Microstructural investigations of the alumina scales grown during high temperature annealing reveal yttrium segregation at oxide grain boundaries as well as significant quantities of zirconium inside the alumina grains. The oxide growth seems to be dominated by a classical grain boundary oxygen diffusion mechanism. The presence of zirconium inside the alumina grains suggests that Al2O3 also partially forms by chemical reduction of ZrO2 by Al.
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Musalek, Radek, Tomas Tesar, Jan Medricky, and Rogerio S. Lima. "High Temperature Cycling Behavior of Novel Thermal Barrier Coatings Deposited by High Enthalpy Plasma Torch." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0688.

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Abstract This study presents the results of thermal cycling experiments on thermal barrier coatings deposited using hybrid water/argon-stabilized plasma (WSP-H) torches. Topcoats produced from YSZ suspensions and powders were successfully prepared and evaluated by thermal fatigue testing. Quad-layer coatings with topcoats consisting of yttria stabilized zirconia, gadolinium zirconate, and yttrium aluminum garnet were also prepared and tested at high temperatures and thermal gradients. The results obtained show the potential of WSP-H technology for applications where protection of large components or deposition of thick coatings are required.
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Sheikholeslam, S. Arash, Cristian Grecu, Hegoi Manzano, and Andre Ivanov. "Hydrogen diffusion characterization of amorphous Yttrium Stabilized Zirconia dielectrics." In 2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2016. http://dx.doi.org/10.1109/nano.2016.7751511.

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Guha, Arjun, M. Alexe, and R. Scholz. "Silicon nanocrystals in superlattices of yttrium-stabilized zirconia and silicon." In Optics & Photonics 2005, edited by Zeno Gaburro and Stefano Cabrini. SPIE, 2005. http://dx.doi.org/10.1117/12.609798.

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Ganapathy Pandian, Sakthinathan. "Tribological Characteristics of Yttria Stabilized Zirconia Nanolubricants." In SAE 2014 International Powertrain, Fuels & Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2014. http://dx.doi.org/10.4271/2014-01-2790.

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Ueta, Shohei, Jun Aihara, Minoru Goto, Yukio Tachibana, and Koji Okamoto. "Development of Security and Safety Fuel for Pu-Burner HTGR: Part 5 — Test and Characterization for ZrC Coating." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67530.

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To develop the security and safety fuel (3S-TRISO fuel) for Pu-burner high temperature gas-cooled reactor (HTGR), R&D on zirconium carbide (ZrC) directly coated on yttria stabilized zirconia (YSZ) has been started in the Japanese fiscal year 2015. As results of the direct coating test of ZrC on the dummy YSZ particle, ZrC layers with 18–21 microns of thicknesses have been obtained with 0.1 kg of particle loading weight. No deterioration of YSZ exposed by source gases of ZrC bromide process was observed by Scanning Transmission Electron Microscope (STEM) observation.
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Burachevsky, Yurii, and Ilya Bakeev. "Properties of Electrical Insulation Coatings from Yttrium-stabilized Zirconia and Alumina." In 2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE). IEEE, 2020. http://dx.doi.org/10.1109/efre47760.2020.9242018.

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Parry, Jon, Fraser Dear, Rehan Ahmed, Jon Shephard, and Duncan Hand. "Fiber laser processing of thick Yttria stabilized zirconia." In ICALEO® 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2008. http://dx.doi.org/10.2351/1.5061286.

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Reports on the topic "Yttrium stabilised zirconium"

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Evans, N. D., P. H. Imamura, M. L. Mecartney, and J. Bentley. Grain boundary studies of doped yttria-stabilized zirconia. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/654194.

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Evans, N. D., P. H. Imamura, M. L. Mecartney, and J. Bentley. Characterization of intergranular phases in tetragonal and cubic yttria-stabilized zirconia. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/650391.

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Leming, Andres. Fabrication of Yttria stabilized zirconia thin films on poroussubstrates for fuel cell applications. Office of Scientific and Technical Information (OSTI), June 2003. http://dx.doi.org/10.2172/893502.

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Lee, You-Kee, Jung-Yeul Kim, Young-Ki Lee, Insoo Kim, Hee-Soo Moon, Jong-Wan Park, Craig P. Jacobson, and Steven J. Visco. Conditioning effects on La1-xSrxMnO3-Yttria stabilized Zirconia electrodes for thin-film solid oxide fuel cells. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/810538.

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Anil V. Virkar. A LOW-COST PROCESS FOR THE SYNTHESIS OF NANOSIZE YTTRIA-STABILIZED ZIRCONIA (YSZ) BY MOLECULAR DECOMPOSITION. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/833636.

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Steven A. Attanasio, David S. Morton, and Mark A. Ando. Measurement and Calculation of Electrochemical Potentials in Hydrogenated High Temperature Water, including an Evaluation of the Yttria-Stabilized Zirconia/Iron-Iron Oxide (Fe/Fe3O4) Probe as Reference Electrode. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/821313.

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Yttria-stabilized zirconia solid oxide electrolyte fuel cells, monolithic solid oxide fuel cells. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/7116623.

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Yttria-stabilized zirconia solid oxide electrolyte fuel cells, monolithic solid oxide fuel cells. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5012099.

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Yttria-stabilized zirconia solid oxide electrolyte fuel cells--- monolithic solid oxide fuel cells. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/5521909.

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Yttria-stabilized zirconia solid oxide electrolyte fuel cells, monolithic solid oxide fuel cells. Quarterly report, April--June 1989. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/10161760.

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