Results 181 to 190 of about 18,795 (238)

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Effect of yttria on thermal transport and vibrational modes in yttria-stabilized hafnia

Ceramics International, 2022
Junwei Che
exaly   +2 more sources

Subsurface segregation of yttria in yttria stabilized zirconia

Journal of Applied Physics, 2002
The segregation behavior in 3 and 10 mol % polycrystalline yttria stabilized zirconia (YSZ), calcined at temperatures ranging from 300 to 1600 °C, is characterized using low-energy ion scattering (LEIS). In order to be able to separate the Y and Zr LEIS signals, YSZ samples have been prepared using isotopically enriched Z94rO0 instead of natural ...
M. de Ridder, R. G. van Welzenis, A. W. Denier van der Gon, H. H. Brongersma, S. Wulff, W.-F. Chu, W. Weppner   +6 more
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Mechanical Strength of Hemispheric Domes of Yttria and Lanthana‐Doped Yttria

Journal of the American Ceramic Society, 1992
The strength of hemispheric ceramic domes was measured in a biaxial flexure test using disklike circular pieces removed with a core drill. Yttria and lanthana‐doped yttria dome cores exhibit approximately 60% of the strength predicted from similarly fabricated flat disks.
Daniel C. Harris, George A. Hayes, Nancy A. Jaeger, Larry D. Sawyer, Richard C. Scheri, Marian E. Hills, Kenneth R. Hayes, Scot E. Homer, Y. L. Tsai, J. J. Mecholsky   +9 more
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Synthesis of yttria nanopowders for transparent yttria ceramics

Optical Materials, 2006
Abstract This paper describes a precipitation process for synthesizing nanocrystalline yttria powder and sintering transparent yttria ceramics. Hydroxide precursor of Y 2 O 3 with an approximate composition of Y 2 (OH) 5 NO 3  · H 2 O was synthesized by using ammonia water as precipitant and yttrium nitrate as the starting salt.
Lei Wen, Xudong Sun, Qi Lu, Guoxiang Xu, Xiaozhi Hu   +4 more
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Alumina and Yttria Powder and Yttria Coatings Made by Ultrasonic Spray Pyrolysis

Chemical Vapor Deposition, 2013
AbstractUltrasonic 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, Knoll, Matthias, Moosburger-Will, Judith, Konrad, Armin, Tidecks, Reinhard, Horn, Siegfried R.   +5 more
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Hydrothermal Synthesis of Yttria-Stabilized Zirconia Nanocrystals with Controlled Yttria Content

Inorganic Chemistry, 2015
In this study, we demonstrate for the first time the hydrothermal synthesis of yttria-stabilized zirconia (YSZ) nanocrystals with controlled yttria content (x = 3-12 mol %; xYSZ) with negligible aggregation from aqueous solution. The nanocrystals were grown via the hydrothermal treatment of basic Zr(IV) and Y(III) carbonate complex aqueous solutions in
Kazuyoshi, Sato, Kazuya, Horiguchi, Taku, Nishikawa, Sadahiro, Yagishita, Kazuo, Kuruma, Takeshi, Murakami, Hiroya, Abe   +6 more
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Yttria concentration dependence of tensile strength in yttria-stabilized zirconia

Journal of Alloys and Compounds, 2004
Abstract 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, Hirohisa Shiota, Katsuhiro Kawachi, Toshio Nakatani   +3 more
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Microencapsulation of silicon nitride particles with yttria and yttria-alumina precursors

Journal of Materials Research, 1990
Procedures 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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