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Showing 1 to 20 of 77 for “"YSZ"”.
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Production of single cell anode-supported SOFC using NiO/YSZ-YSZ-LSM/YSZ powder materials
… process. The materials for single cell are NiO/YSZ, YSZ, LSM/YSZ as anode, electrolyte and cathode, respectively. The cornstarch is used to create anode porosity while the material binder of the powder is polyvinyl alcohol (PVA) to increase green compact strength. The consolidation of anode was …
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Calibration of YSZ sensor for the measurement of oxygen concentration in Lbe
… style voltametric oxygen sensors, with YSZ (Yttria Stabilized Zirconia) as electrolyte and molten bismuth saturated with oxygen as reference was selected. An instrumentation system was designed specifically for calibrating the YSZ sensor and measure oxygen concentration in LBE. An …
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Thermal Evolution of MAS, YSZ and GZO Thermal Barrier Coating Materials in Benign and CMAS Rich Environments
… conventional choice, yttria-stabilised zirconia (YSZ), exhibits vulnerabilities, such as sintering induced stiffening, phase transformations, and susceptibility to molten siliceous debris. This study investigates the potential of magnesia-alumina spinel (MAS) as an alternative top coat material …
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Effect of temperature, oxygen partial pressure and current on the kinetics of the noble-metal / YSZ interfacial reaction
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
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X-ray photoelectron spectroscopy (XPS) study of single crystal UO2 and U3O8 on r-plane sapphire and yttrium stabilized zirconium (YSZ) substrates
The purpose of the work performed in this thesis is to demonstrate the ability of a magnetron sputtering system to grow single crystal thin films of Uranium Oxides with and without specifically added Neodymium impurities. To do this we analyzed our thin films using X-ray Photoelectron Spectroscopy …
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Preparation of high purity doped oxides for fundamental studies
Yttria-stabilized zirconia (YSZ) is an important ceramic and is critical in electrochemical applications. Small amounts of transition metal dopants are shown to influence mechanical and electronic properties of YSZ. In this work, a novel method was used to synthesize 0.01, 0.1, 0.5, and 1.0 mol % …
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Heat treatment and additive effects on microstructure and properties of tetragonal-(2-3 mol%) yttria-stabilized-zirconia
… (2-3 mol%) yttria-stabilized-zirconia (YSZ) was investigated. Preliminary studies on compositional effects were studied in 2-3 mol% YSZ prepared from a mixed oxide powder. Microstructure-property relationships were then investigated as a function of heat treatment conditions in 3 mol% …
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Fabrication and characterisation of nickel/yttria stabilised zirconia cermet anodes for solid oxide fuel cells
… objective of this thesis was to study the Ni/YSZ system from powder preparation to electrochemical and morphological characterisation. Nickel/yttria stabilised zirconia (YSZ) cermet systems are employed as anode materials in high temperature solid oxide fuel cell (SOFC) applications. The …
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Study of microstructure effect on the thermal properties of Yttria-stabilized-Zirconia thermal barrier coatings made by atmospheric plasma spray and pressing machine
… better efficiency. Yttria-Stabilized-Zirconia (YSZ), a material with low thermal conductivity, is commonly used as the top coat layer to provide the thermal barrier effect. In this dissertation the thermo-physical properties of a variety of TBCs samples made out of different fabrication …
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Hot corrosion behaviour of new candidates for thermal barrier coatings application in turbine simulated environments
… turbine engines. The current material of choice (YSZ) degrades when it contacts with impurities arise from low quality fuels such vanadium and sulfur. YSZ cannot be used in temperature higher than 900˚C. Higher efficiency and performance of gas turbine engines will require a new generation of …
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Microstructure, residual stress, and mechanical properties of thin film materials for a microfabricated solid oxide fuel cell
… solid electrolyte: Yttria Stabilized Zirconia (YSZ). Stress and structure of reactive RF sputtered YSZ films are explored as a function of thickness (5nm - 1000nm), deposition pressure (5mtorr - 1OOmtorr), and substrate temperature (room temperature, 3000C and 6000C). Microstructure is …
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Materials Development for the Fabrication of Metal-Supported Solid Oxide Fuel Cells by Co-sintering
… MS-SOFC by cost-effective co-sintering approach. YSZ (Y2O3 stabilized ZrO2), Ni-YSZ cermet, and ferritic stainless steel are considered for the electrolyte, anode and the support respectively. The anode and electrolyte were modified with the help of suitable dopants and the multilayer design was …
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Solid oxide fuel cell electrolytes produced via very low pressure suspension plasma spray and electrophoretic deposition
… % Y<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub> (YSZ) and gadolinia-doped ceria (GDC), powders, including those in suspension with scandium-nitrate dopants, were deposited on NiO-YSZ anodes, via very low pressure suspension plasma spray (VLPSPS) at Sandia National Laboratories' Thermal Spray …
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Catalysts and materials development for fuel cell power generation
… ceria sol-gel and yttria-stabilized zirconia (YSZ) colloid were developed as inorganic binders for cathode application at temperatures below 600°C. The YSZ sol provided adhesion strength for La0.8Sr0.2Fe0.8Co0.2O3 (LSCF) in excess of 1000 psi. However, the low-temperature calcination process …
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Interactions of the Air Electrode with Electrolyte and Interconnect in Solid Oxide Cells
… an yttria-stabilized zirconia electrolyte (YSZ)/strontium-doped lanthanum manganite electrode (LSM)/AISI 441 stainless steel interconnect tri-layer structure has been fabricated in order to simulate the air electrode working environment of a real cell. The tri-layer samples have been treated …
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Non-destructive Microstructural Evaluation Of Yttria Stabilized Zirconia, Nickel Aluminides And Thermal Barrier Coatings Using Electrochemical Impedance Spectroscopy
… included polycrystalline ZrO2-7~8 wt.%Y2O3 (YSZ) (topcoat) of two different densities were subjected to sintering by varying the sintering temperature and holding time for three different thickness and hot extruded NiAl alloy buttons which were subjected to isothermal oxidation with varying …
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Ionic mobility and superplasticity in ceramics
… characteristics of two SIC's, Bi₂O₃ and YSZ (yttria-stabilized zirconia), and to attempt a correlation of their behavior. Compressive deformation of these two materials was conducted over a wide range of temperatures and at various strain rates in an effort to characterize the temperature …
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Microfabrication methods to improve the kinetics of the yttria stabilized zirconia -- platinum -- oxygen electrode
… geometry were sputtered onto the surface of bulk YSZ and onto sputtered YSZ thin films. An unexpected result was found whereby YSZ films of composition Y0.09Zr0.91O2-x had an ionic conductivity remarkably enhanced by a factor of 20-30. This is attributed to the films exhibiting nanometric grain …
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Development of REBCO Tapes on Non-Metallic Flexible Substrates for RF Applications
… and flexible yttria-stabilized zirconia (YSZ) with low thermal conductivity, low RF loss, and a relatively low dielectric constant was used as a substrate for epitaxial REBCO films. The YSZ substrate surface was planarized to a surface roughness Rq of about 1 nm, as measured by atomic …
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Deposition of yttria-stabilized zirconia thermal barrier coatings by laser-assisted plasma coating at atmospheric pressure
… to deposit the yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBC) at atmosphere pressure. These coatings can be applied on silicon wafers, and multi-layer nickel-based superalloy substrates (René N5), by a new deposition technique called laser-assisted plasma coating at …
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