Results 201 to 210 of about 18,795 (238)
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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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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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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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Colloidal Stability and Sintering of Yttria–Silica and Yttria–Silica–Alumina aqueous suspensions
Journal of the European Ceramic Society, 1999Abstract The aim of this work was to produce dense yttrium silicate materials by slip casting, with more than 90% of Y2SiO5 phase. The rheological behaviour of concentrated aqueous slips was studied considering the effect of the dispersing additives, solids content and pH. The densification kinetics was examined as a function of temperature and time,
M Aparicio, R Moreno, A Durán
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Solid State Ionics, 2004
Abstract (ZrO2:8 mol% Y2O3)+m mol% Y2O3 ceramic composites with nominal yttria concentration varying from 0 to70 mol% (0–82.9 vol.%) were prepared by evaporation of a suspension of ZrO2:8 mol% Y2O3 and Y2O3 in ethanol followed by pressing and sintering.
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Abstract (ZrO2:8 mol% Y2O3)+m mol% Y2O3 ceramic composites with nominal yttria concentration varying from 0 to70 mol% (0–82.9 vol.%) were prepared by evaporation of a suspension of ZrO2:8 mol% Y2O3 and Y2O3 in ethanol followed by pressing and sintering.
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