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Showing 1 to 20 of 90 for “"Yttria"”.
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Low-energy excitations in yttria-stabilized zirconia
Thermal conductivity, specific heat, dielectric constant and thermal expansion measurements below 2 K on single crystal samples of Zr02 :Y203 with 10.5, 16 and 18 mole % Y2O3 contents exhibit properties typical of glasses. The presence of glass-like excitations having a broad spectrum of energies …
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Příprava chemicky vázané fosfátové keramiky na bázi yttria
Diplomová práce je zaměřena nejprve na literární rešerši problematiky fosfátové keramiky a následně na hledání vhodné syntézy fosfátového pojiva na bázi Y2O3-P2O5-H2O a charakterizaci výsledných produktů. Byly připraveny různé typy syntéz s následnou charakterizací fázového a chemického složení …
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Digital deposition of yttria patterns on titanium sheets
The ability to apply Yttria patterns on titanium sheets is required on a secondary manufacturing operation. The freedom to create 2 dimensional patterns as well as 3 dimensional ones by using Three Dimensional Printing allows for the application of Yttria patterns onto these sheets without the use …
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Reaction sintering of yttria stabilized zirconia via nickel oxide
Includes bibliographical references (pages 49-52).
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Effect of Oxide Additives on the Sintering of Yttria
Made available in DSpace on 2014-12-12T00:32:33Z (GMT). No. of bitstreams: 1 7207117.pdf: 5369919 bytes, checksum: f09691a65396bd32408c145c86d67629 (MD5) Previous issue date: 1971
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Effect of sintering protocols on zirconia with various YTTRIA concentrations
… and biaxial flexural strength of different yttria concentrations of Tosoh zirconia materials (TZ-3YSB-E, TZ-3YB-E, Zpex, and Zpex Smile). MATERIALS AND METHODS: A total of 242 zirconia discs were manufactured from commercially available Tosoh zirconia powders. Zpex smile, Zpex, TZ-3YB-E, and …
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Electrochemical vapor deposition of yttria stabilized zirconia on porous graphite substrates
The main goal of this study was to deposit stabilized zirconia films on a porous graphite substrate by electrochemical vapor deposition using CO as the oxidizing agent. Five experimental variables, deposition temperature, deposition time, gas flow rate, anode H$\sb2$/Ar ratio, and substrate …
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Chemical vapor deposition of solid solutions in the system zirconia-yttria.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Metallurgy and Materials Science, 1972
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Oxidation of butene over platinum catalysts in a zirconia-yttria electrochemical reactor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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Catalytic properties, densification and mechanical properties of nanocrystalline yttria-zirconia-based materials
Alumina, titania, ceria and manganese oxide were either coated onto or doped in cubic 7 mol% Y203-ZrO2 (7YZ) nanocrystals to form nanocomposites for methane combustion. These novel catalysts were very active and thermally stable. In particular, 25 wt% Mn203-coated 7YZ and 25 wt% Mn203-doped 7YZ …
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Electrochemical vapor deposition of a graded titanium oxide-yttria stabilized zirconia layer
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Computational studies of cation and anion ordering in cubic yttria stabilized zirconia
… system of interest. The cluster expansion of the yttria stabilized zirconia system considers 447 configurations across the ZrO2-Y203 composition range. The effective cluster interaction for pair clusters show electrostatic repulsion between anions and little interaction between cations. Triplet …
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Fabrication of sensitive high-temperature superconducting bolometers on a yttria-stabilized zirconia membrane
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Electrochemical Investigation of Thin Nickel, Copper and Silver Films Interfaced with Yttria-Stabilized Zirconia
… copper and silver thin films interfaced with yttria stabilized zirconia (YSZ) solid electrolyte was accomplished to determine their response to polarization in dilute oxygen environments at 350 °C and assess their viability for electrochemical promotion of catalysis (EPOC). Polycrystalline YSZ …
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Microfabrication methods to improve the kinetics of the yttria stabilized zirconia -- platinum -- oxygen electrode
… of platinum electrodes on the surface of yttria stabilized zirconia electrolytes. Platinum electrodes with well controlled 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 …
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Fabrication and characterisation of nickel/yttria stabilised zirconia cermet anodes for solid oxide fuel cells
… 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 ionically conducting YSZ powder was modified, by sintering and milling to vary the particle …
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Deposition of yttria-stabilized zirconia thermal barrier coatings by laser-assisted plasma coating at atmospheric pressure
… this study, the APP is utilized 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 …
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Heat treatment and additive effects on microstructure and properties of tetragonal-(2-3 mol%) yttria-stabilized-zirconia
… behavior of predominantly-tetragonal (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 …
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Non-destructive Microstructural Evaluation Of Yttria Stabilized Zirconia, Nickel Aluminides And Thermal Barrier Coatings Using Electrochemical Impedance Spectroscopy
There has been an urge for increasing the efficiency in advanced gas turbine engines. To fulfill these needs the inlet gas temperatures should be increased in the gas turbine engines, thermal barrier coatings (TBCs) have gained significant applications in increasing the gas inlet temperatures. …
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