Results 211 to 220 of about 55,297 (275)

Aging resistance, mechanical properties and translucency of different yttria-stabilized zirconia ceramics for monolithic dental crown applications.

Dental Materials, 2018
OBJECTIVES The dental market moves towards high-translucency monolithic zirconia dental crowns, which are usually placed either with - or without - a thin glaze layer.
E. Camposilvan, R. Leone, L. Grémillard, R. Sorrentino, F. Zarone, Marco Ferrari, J. Chevalier   +6 more
semanticscholar   +1 more source

Promoted nickel-based catalysts on modified mesoporous silica support: The role of yttria and magnesia on CO2 methanation

, 2020
In this research, a group of xY2O3-Ni/MgO-MCM-41catalysts were synthesized by using direct synthesis method for CO2 hydrogenation and were characterized by employing BET, XRD, HRTEM, XPS, TPD, FE-SEM and TPO to understand the mechanism of CO2 ...
Z. Taherian, A. Khataee, Yasin Orooji
semanticscholar   +1 more source

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
openaire   +1 more source

Composite ceramics thermal barrier coatings of yttria stabilized zirconia for aero-engines

, 2019
Composite ceramics thermal barrier coatings (TBCs) are widely used in the aero-engines field due to their excellent thermal insulation, which improves the service life and durability of the inherent hot components. The most typical, successful and widely
Qiaomu Liu, Shunzhou Huang, A. He
semanticscholar   +1 more source

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
openaire   +2 more sources

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
openaire   +2 more sources

A comparative study of zirconia and yttria promoted mesoporous carbon-nickel-cobalt catalysts in steam reforming of ethanol for hydrogen production

, 2020
Steam reforming of ethanol process was evaluated over unpromoted / yttria and zirconia-promoted mesoporous carbon-Ni-Co catalysts. The nickel and cobalt ions were added during the synthesis of mesoporous carbon support and then yttrium and zirconium ...
Vahid Shahed Gharahshiran, M. Yousefpour, Vahid Amini   +2 more
semanticscholar   +1 more source

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
openaire   +1 more source

X-ray diffraction analysis of the yttria stabilized zirconia powder by mechanical alloying and sintering

, 2020
In the present work, monoclinic zirconia was mechanically alloyed with yttria (6–14 mol%) via ball milling at the different ball-to-powder mass ratios (BPMRs) for 3–24 h, and then, the mixed powders were sintered at 1100 °C and 1500 °C.
Guangdi Zhou, P. Jin, Yuan Wang, Guang-ling Pei, Ju Wu, Zhan-guo Wang   +5 more
semanticscholar   +1 more source

Nanograined highly transparent yttria ceramics

Optics Letters, 2009
The 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, B Yazgan, Kokuoz, B, Kokuoz, J, Ballato   +3 more
openaire   +2 more sources