Results 151 to 160 of about 31,851 (184)
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Yttria concentration dependence of tensile strength in yttria-stabilized zirconia
Journal of Alloys and Compounds, 2004Abstract Tensile and bending tests were performed for ZrO2 polycrystals stabilized with 2.6–10 mol % Y2O3. There is no significant difference in the isothermal Young’s modulus of all the compositions. Both the tensile and bending strengths of PSZ are markedly higher than those of FSZ.
Junya Kondoh +3 more
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Nanograined highly transparent yttria ceramics
Optics Letters, 2009The field of transparent ceramics is enjoying a renaissance, as refractory oxides are being developed as alternatives to single crystals in high-performance laser systems. However, a significant challenge remains regarding the reduction of the grain size to sufficiently subwavelength dimensions in order to achieve the same degree of optical ...
K, Serivalsatit +3 more
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Alumina and Yttria Powder and Yttria Coatings Made by Ultrasonic Spray Pyrolysis
Chemical Vapor Deposition, 2013AbstractUltrasonic spray pyrolysis is used to produce metal oxide powders (alumina, yttria, and mixtures of these) from nitrate precursors at temperatures below 500 °C. Moreover, yttria powder coatings on soda‐lime glass and fused silica substrates are generated. The as‐prepared powders and coatings are examined using scanning electron microscopy (SEM),
Santos Abreu, Alexandre +5 more
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Luminescent enhancement in europium-doped yttria nanotubes coated with yttria
Applied Physics Letters, 2006Europium-doped yttria nanotubes were coated with yttria by a simple two-step hydrothermal method, forming the Y2O3:Eu3+∕Y2O3 core-shell composite. Remarkable improvement of photoluminescence was observed in the core-shell composite under both violet and ultraviolet excitations.
Xue Bai +9 more
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Thermal expansion coefficient of yttria stabilized zirconia for various yttria contents
Solid State Ionics, 2005Abstract Thermal expansion coefficients of yttria stabilized zirconia(YSZ) with the Y 2 O 3 content of 3, 6, 8 and 10 mol% were measured using a push-rod type dilatometer in the temperature range from 103 to 876 K. The thermal expansion coefficient of YSZ decreased with the increase of the Y 2 O 3 content.
H HAYASHI +5 more
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Microencapsulation of silicon nitride particles with yttria and yttria-alumina precursors
Journal of Materials Research, 1990Procedures are described to deposit uniform layers of yttria and yttria-alumina prccursors on fine powders and whiskers of silicon nitride. The coatings were produced by aging at elevated temperatures aqueous systems containing the silicon nitride core particles, yttrium and aluminum nitrates, and urea.
Ajay K. Garg, Lutgard C. De Jonghe
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Solid State Ionics, 1992
Abstract The degree of solid solubility between yttria and calcia was measured, in the yttria-rich region, over the temperature range 1200 to 2000°C. X-ray diffraction results indicate that as much as 12.4 mol% calcia can be dissolved in yttria at 2000°C. No solid solution between the two oxides was observed below 1400°C.
J BROWN, T ETSELL
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Abstract The degree of solid solubility between yttria and calcia was measured, in the yttria-rich region, over the temperature range 1200 to 2000°C. X-ray diffraction results indicate that as much as 12.4 mol% calcia can be dissolved in yttria at 2000°C. No solid solution between the two oxides was observed below 1400°C.
J BROWN, T ETSELL
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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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Polymeric Precursors for Yttria
MRS Proceedings, 1994ABSTRACTPolymers that can be easily processed into fibers, films, or bodies are excellent precursors for ceramics with useful morphologies. The ideal preceramic polymer not only has proper physical properties (e.g. solubility or fusibility) for processibility but also decomposes at
Allen W. Apblett +5 more
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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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