Results 271 to 280 of about 61,470 (293)
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Surface characterization of zirconia, holmium oxide/zirconia and sulfated zirconia catalysts
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2006Abstract Zirconia-supported holmium oxide, as well as their sulfated catalysts using (NH 4 ) 2 SO 4 were prepared by wet impregnation and calcined at different temperatures. The samples thus obtained were subjected to bulk and surface texture analysis using X-ray powder diffractometry (XRD) and N 2 -sorptiometry, respectively.
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Phase transformation of zirconia in sulfated zirconia–LiCl system
Materials Letters, 2007Abstract The phase transformation from tetragonal to monoclinic of zirconia for a series of sulfated zirconia–LiCl samples was characterized by ultraviolet Raman spectroscopy (UVRS) and X-ray diffraction (XRD). Results show that such phase transformation increases with increasing LiCl content and the monoclinic phase is first detected by XRD than ...
Huilin Wan +5 more
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Enhancing the bioactivity of zirconia and zirconia composites by surface modification
Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2012AbstractAmong bioceramics, zirconia (ZrO2) and alumina (Al2O3) possess exceptional mechanical properties suitable for load‐bearing and wear‐resistant applications but the poor bioactivity of these materials is the major concern when bonding and integration to the living bone are desired.
Erik Adolfsson +2 more
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2008
Publisher Summary The concept of stress-induced phase transformation in zirconia ceramics represents one of the most remarkable innovations in the ceramic field. It was shown in the 1970s that zirconia exhibits a transformation toughening mechanism acting to resist crack propagation. Yttria-Stabilized Zirconia ceramics (Y-TZP) belong to this family of
L Gremillard, J Chevalier
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Publisher Summary The concept of stress-induced phase transformation in zirconia ceramics represents one of the most remarkable innovations in the ceramic field. It was shown in the 1970s that zirconia exhibits a transformation toughening mechanism acting to resist crack propagation. Yttria-Stabilized Zirconia ceramics (Y-TZP) belong to this family of
L Gremillard, J Chevalier
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Electrolytic deposition of zirconia and zirconia organoceramic composites
Materials Letters, 2000Abstract Thin films of zirconia and an organoceramic composite consisting of zirconium hydroxide and poly(diallyldimethylammonium chloride) (PDDA) were obtained via cathodic electrodeposition. Films up to 10-μm-thick were obtained on Ni and porous Ni–yttria-stabilized zirconia (YSZ) cermet substrates. By varying the current density, concentrations of
A Petric, Igor Zhitomirsky
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Interaction of zirconia primers with yttria-stabilized zirconia surfaces
Dental Materials, 2016Recently several zirconia primers have been introduced to mediate bonding of dimethacrylate resins to yttria-stabilized zirconia frameworks (Y-TZP). The aim of the study was to evaluate the changes in surface chemistry of Y-TZP frameworks induced by zirconia primer treatments.Polished Y-TZP discs (Lava, 3M ESPE), ultrasonicated for 10min in ethanol ...
Spiros Zinelis +3 more
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Hydrothermal Crystallization of Zirconia and Zirconia Solid Solutions
Journal of the American Ceramic Society, 1991Zirconia as well as yttria‐zirconia and calcia‐zirconia solid‐solution powders were crystallized under hydrothermal conditions from (co)precipitated hydroxides. The morphology of the powder particles is strongly dependent on the crystallization conditions. The powders crystallized in a water solution of Na, K, and Li hydroxides show elongated particles
Miroslaw M. Bułko +2 more
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Preparation and Characterization of Zirconia-Yttria/Zirconia-Magnesia Composites
Materials Science Forum, 2006ZrO2: 3mol% Y2O3 powders were mixed in different proportions to ZrO2: 8 mol% MgO, pressed and sintered at 1500°C for producing composites with oxygen ion conductivity better than that of ZrO2: 8 mol% MgO and thermal shock resistance better than that of ZrO2: 3 mol% Y2O3.
E. Caproni, Reginaldo Muccillo
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Crystallization of stable mesoporous zirconia and ceria-zirconia
2007Crystallization of Mesoporous zirconia and ceria-zirconia structures were realized using a long-chain amine template. By controlled heating of the synthesis gel it was possible to prepare well-crystalline mesoporous strctures for these materials. The surface areas, mesopore ordering and thermal stabilities of the final product is dependent on the ...
Kenichirou Suzuki, Anil K. Sinha
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Zirconia in biomedical applications
Expert Review of Medical Devices, 2016The use of zirconia in medicine and dentistry has rapidly expanded over the past decade, driven by its advantageous physical, biological, esthetic, and corrosion properties. Zirconia orthopedic hip replacements have shown superior wear-resistance over other systems; however, risk of catastrophic fracture remains a concern.
John C. Wataha +3 more
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