Results 181 to 190 of about 4,420 (220)
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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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Phase relationships in the yttria-rich part of the yttria-zirconia system
Journal of Materials Science, 1977Phase equilibria in yttria-zirconia mixtures containing not less than 50 mol % YO1.5 have been studied between 1200 and 2200° C. The solubility of zirconia in yttria is shown to decrease with increasing temperature: the miscibility gap between the zirconia (fluorite) and yttria (type C rare earth) solid solutions extends from 64 to 75 mol % YO1.5 at ...
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Dense and High Purity Yttria Coatings by APS with a New Yttria Powder
International Thermal Spray Conference, 2013Abstract This study compares the morphology, porosity, and purity of yttria powders produced by spray drying, spray drying and sintering (SDS), and spray drying and plasma fusion (SDPF). The surface morphology of each type of powder is examined by SEM.
A. Allimant, D. Billières, H. Wallar
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Combustion synthesis of yttria
Journal of Materials Chemistry, 1995Fine-particle, sinter-active yttria has been prepared by combustion of a redox compound, Y(N2H3COO)3·3H2O and mixtures of Y(N2H3COO)3·3H2O–NH4NO3 or NH4ClO4 as well as yttrium nitrate and hydrazine-based fuels. The fineparticle nature of the combustion-derived yttria has been investigated using powder density, particle size and BET surface area ...
Sambandan, Ekambaram, Patil, Kashinath C
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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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Journal of the American Ceramic Society, 1975
Phase equilibria in the yttria‐hafnia system were investigated by high‐temperature and room‐temperature X‐ray diffraction. The HfO 2 transformation, solid solution limits, and liquidus temperatures are given. A tentative phase diagram is proposed.
D. W. STACY, D. R. WILDER
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Phase equilibria in the yttria‐hafnia system were investigated by high‐temperature and room‐temperature X‐ray diffraction. The HfO 2 transformation, solid solution limits, and liquidus temperatures are given. A tentative phase diagram is proposed.
D. W. STACY, D. R. WILDER
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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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Effects of yttria concentration on the EPR signal in x-ray-irradiated yttria-stabilized zirconia
Physical Review B, 1989The anisotropic EPR signal already observed in x-ray-irradiated yttria-stabilized zirconia is analyzed between 140 and 300 K in samples containing 12% and 24% ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$. A temperature-dependent broadening is detected and attributed to spin-lattice interactions whose mechanisms are discussed.
Azzoni, C, PALEARI, ALBERTO MARIA FELICE
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Production of yttria ceramics by gelcasting
2011The production of yttria ceramics by green-gelcasting technique was developed through: (1) optimization of aqueous yttria slurries; (2) optimization of the gelcasting process; (3) thermal treatments and characterization of the final microstructures. Different dispersants were tested. Zeta potential characterization of the dispersed state was performed.
Alex Sangiorgi +4 more
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Journal of the American Ceramic Society, 1986
Yttria‐partiaUy‐stabilized zirconia was grown frcm the melt by the arc‐image floating zone technique and annealed at 1700'C. The yttria concentration of the crystal was measured by analytical electron microscopy. The crystal, which contained 8.6 mol% YO 1. 5 , consists of tetragonal and cubic
Takeshi Yagi +4 more
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Yttria‐partiaUy‐stabilized zirconia was grown frcm the melt by the arc‐image floating zone technique and annealed at 1700'C. The yttria concentration of the crystal was measured by analytical electron microscopy. The crystal, which contained 8.6 mol% YO 1. 5 , consists of tetragonal and cubic
Takeshi Yagi +4 more
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