Results 161 to 170 of about 31,851 (184)
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Journal of The Electrochemical Society, 1951
The phase relationships in the zirconia‐yttria system have been established up to 2000°C. The addition of 0 to 5 mole per cent yttria lowers the temperature at which zirconia transforms from the tetragonal to the monoclinic form. From 7 to 55 mole per cent yttria is soluble in zirconia and this solid solution is cubic (stabilized zirconia). A two‐phase
Pol Duwez, Frank H. Brown, Francis Odell
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The phase relationships in the zirconia‐yttria system have been established up to 2000°C. The addition of 0 to 5 mole per cent yttria lowers the temperature at which zirconia transforms from the tetragonal to the monoclinic form. From 7 to 55 mole per cent yttria is soluble in zirconia and this solid solution is cubic (stabilized zirconia). A two‐phase
Pol Duwez, Frank H. Brown, Francis Odell
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Optics and Spectroscopy, 2008
Pulsed cathodoluminescence of samples of nominally pure yttria—commercially available powder, nanopowder prepared from it, and ceramics sintered from this nanopowder—is studied in the range 380–850 nm. The luminescence spectra at room temperature exhibit broad bands at λ ≈ 437 and 487 nm and series of narrow bands that are located in the blue (435–510 ...
V. V. Osipov +2 more
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Pulsed cathodoluminescence of samples of nominally pure yttria—commercially available powder, nanopowder prepared from it, and ceramics sintered from this nanopowder—is studied in the range 380–850 nm. The luminescence spectra at room temperature exhibit broad bands at λ ≈ 437 and 487 nm and series of narrow bands that are located in the blue (435–510 ...
V. V. Osipov +2 more
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Mechanical evaluation of yttria
SPIE Proceedings, 1990A method is described to make multiple measurements of the strength of a single hemispherical ceramic dome with a ring-on-ring flexure test of disklike sections removed from the dome by a core drill. Preliminary results show that dome cores exhibit lower strength than flat disks, because the domes have larger critical surface flaws than those ...
Daniel C. Harris +8 more
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Electronic and optical properties of yttria
Physical Review Letters, 1990The electronic structure and bonding in the ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ crystal is completely elucidated by first-principles self-consistent band-structure and optical calculations. Results agree well with experiments. The unique type of bonding in ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ is emphasized; it does not support the fully ionic picture ...
, Ching, , Xu
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High Yttria-Zirconia and Yttria Ceramics for Petrochemical Reverse-Flow Reactor Applications
International Journal of Applied Ceramic Technology, 2014Reverse-flow reactors achieve the desired hydropyrolysis reaction of natural gas and other hydrocarbon feeds at very high temperatures of up to 2000°C, which enables the production of many high-value chemicals. To identify refractory ceramic materials suitable for constructing key components of the reactor, the full range of solid solutions between ...
ChangMin Chun +3 more
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Paramagnetic defects in electron-irradiated yttria-stabilized zirconia: Effect of yttria content
Journal of Applied Physics, 2011We have studied the effect of the yttria content on the paramagnetic centers in electron-irradiated yttria-stabilized zirconia (ZrO2: Y3+) or YSZ. Single crystals with 9.5 mol % or 18 mol % Y2O3 were irradiated with electrons of 1.0, 1.5, 2.0, and 2.5 MeV.
Jean-Marc Costantini +4 more
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1992
Silicon oxynitride ceramics have been prepared from Si3N4 and SiO2 by pressureless sintering at 1600 and 1775°C and by hot isostatic pressing (HIP) at 1600, 1750 and 1900°C, with Y2O3 (0–10 wt%) as a sintering aid. Pressurelessly sintered samples were in general porous, whereas the HIPed samples were dense at all temperatures.
T. Ekström, M. Holmström, P.-O. Olsson
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Silicon oxynitride ceramics have been prepared from Si3N4 and SiO2 by pressureless sintering at 1600 and 1775°C and by hot isostatic pressing (HIP) at 1600, 1750 and 1900°C, with Y2O3 (0–10 wt%) as a sintering aid. Pressurelessly sintered samples were in general porous, whereas the HIPed samples were dense at all temperatures.
T. Ekström, M. Holmström, P.-O. Olsson
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Journal of the American Ceramic Society, 1978
Binder phase (primarily chloride or nitrate) formation was examined in YX 3 ‐NaOH‐H 2 O, Y 2 O 3 ‐acid‐H 2 O, and Y
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Binder phase (primarily chloride or nitrate) formation was examined in YX 3 ‐NaOH‐H 2 O, Y 2 O 3 ‐acid‐H 2 O, and Y
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X-ray photoelectron spectroscopic studies on yttria, zirconia, and yttria-stabilized zirconia
Journal of Applied Physics, 1991Surfaces of yttria, zirconia, and yttria-stabilized zirconia were studied using x-ray photoelectron spectroscopy. An almost threefold increase in the surface yttrium concentration was observed in the yttria-stabilized zirconia samples. The core level binding energies of yttrium, zirconium, and oxygen ions in yttria-stabilized zirconia showed chemical ...
Debasis Majumdar, Dilip Chatterjee
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Influence of yttria content on the preparation of nanocrystalline yttria-doped zirconia
Journal of Materials Research, 1995Nanocrystalline zirconia doped with 0–10 mol % Y2O3 has been prepared by a combustion synthesis process, followed by a rapid densification process. The concentration of Y2O3 in the as-reacted zirconia appeared to have a significant influence on the reduction of the crystallite size, in the combustion temperature range studied (450 °C–550 °C), as well ...
Dai Huang +2 more
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