Synthesis of ZrO&lt;sub&gt;2&lt;/sub&gt;-Based Ceramics for Applications in SOFC

Ussui, Valter; Leitão, Fredner; Yamagata, Chieko; Menezes, Christiane A.B.; Lazar, Dolores Ribeiro Ricci; Pascoal, José Octavio A.

doi:10.4028/www.scientific.net/msf.416-418.681

Cited by 12 publications

(7 citation statements)

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“…The TiO 2 and ZrO 2 powders were obtained following the procedures described by Ussui et al in 2003 37. All ceramics were prepared by a coprecipitation technique.…”

Section: Methodsmentioning

confidence: 99%

“…The TiO 2 and ZrO 2 powders were obtained following the procedures described by Ussui et al in 2003. 37 All ceramics were prepared by a coprecipitation technique. Briefly, calculated amounts of zirconium oxychloride, titanium chloride, yttrium chloride, and titanium chloride solutions were mixed and added dropwise to an aqueous solution of ammonium hydroxide.…”

Section: Samples Preparationmentioning

confidence: 99%

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Analysis in vitro of the cytotoxicity of potential implant materials. I: Zirconia‐titania sintered ceramics

et al. 2010

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Zirconia (ZrO2) is a bioinert, strong, and tough ceramic, while titania (TiO2) is bioactive but has poor mechanical properties. It is expected that ZrO2-TiO2 mixed ceramics incorporate the individual properties of both ceramics, so that this material would exhibit better biological properties. Thus, the objective of this study was to compare the biocompatibility properties of ZrO2-TiO2 mixed ceramics. Sintered ceramics pellets, obtained from powders of TiO2, ZrO2, and three different ZrO2-TiO2 mixed oxides were used. Roughnesses, X-ray diffraction, microstructure through SEM, hardness, and DRIFT characterizations were performed. For biocompatibility analysis cultured FMM1 fibroblasts were plated on the top of disks and counted in SEM micrographs 1 and 2 days later. Data were compared by ANOVA complemented by Tukey's test. All samples presented high densities and similar microstructure. The H2O content in the mixed ceramics was more evident than in pure ceramics. The number of fibroblasts attached to the disks increased significantly independently of the experimental group. The cell growth on the top of the ZrO2-TiO2 samples was similar and significantly higher than those of TiO2 and ZrO2 samples. Our in vitro experiments showed that the ZrO2-TiO2 sintered ceramics are biocompatible allowing faster cell growth than pure oxides ceramics. The improvement of hardness is proportional to the ZrO2 content. Thus, the ZrO2-TiO2 sintered ceramics could be considered as potential implant material.

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“…The TiO 2 and ZrO 2 powders were obtained following the procedures described by Ussui et al in 2003 37. All ceramics were prepared by a coprecipitation technique.…”

Section: Methodsmentioning

confidence: 99%

Section: Samples Preparationmentioning

confidence: 99%

Analysis in vitro of the cytotoxicity of potential implant materials. I: Zirconia‐titania sintered ceramics

et al. 2010

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“…The samples were codified as ZY3Tx, where x is the TiO 2 molar concentration. According to experimental conditions established in our previous work [16], the zirconium oxychloride, titanium chloride and yttrium chloride solutions were mixed and added drop-wise to an aqueous solution of ammonium hydroxide. The obtained precipitates were filtered and washed successively with water and then with ethanol.…”

Section: Methodsmentioning

confidence: 99%

Room temperature plasticity of zirconia-yttria-titania ceramics: Experimental indications and structural modelling

Ussui

Lazar

Lima

et al. 2022

PAC

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Yttria-stabilized tetragonal zirconia (Y-TZP) ceramics have excellent mechanical properties. However, such materials cannot undergo plastic deformation at room temperature due to their high hardness and brittleness values, hindering machinability. To overcome these limitations, we propose a zirconia-yttria-titania ceramics, based on zirconia containing 3mol% yttria and up to 15mol% titania. The zirconia-yttria-titania powders were synthesized by co-precipitation method, uniaxially pressed and sintered at 1400?C/5 h. Sample characterizations were carried out by X-ray diffraction, scanning electron microscopy and mechanical properties through Vickers hardness and toughness measurements. Compared to the Y-TZP ceramics, the yttria stabilised tetragonal zirconia ceramics co-doped with 10mol%Ti showed noticeable increase of tetragonality parameter, higher toughness and lower hardness values, indicating plasticity at room temperature. Furthermore, the atomistic simulation by Density Functional Theory methodology suggests the occurrence of spatial arrangement of the atoms, explaining the proposed plasticity.

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“…The calcinated Al 2 O 3 fibers were impregnated with the zirconium hydroxide slurry to form a structure of Al 2 O 3 covered with ZrO 2 . After impregnation, samples were sintered on the electric oven at 1200-1600°C in air for 4 hours using a heating rate of 2°C/min causing the transition of zirconium hydroxide to zirconia while the fibers are sintered [14].…”

Section: Methodsmentioning

confidence: 99%

Al2O3 and Al2O3-ZrO2 Fibers Obtained by Biotemplete with Low Thermal Conductivity

Delbrücke¹,

Gouvêa²,

Raubach³

et al. 2015

Sintering Techniques of Materials

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Certain porous materials have special properties and functions that cannot normally be obtained by conventional dense counterparts. Therefore, porous materials are now used in many applications such as final products and in various technological processes. Macroporous materials are used in various forms and compositions in everyday life; e.g. polymeric foams, packaging, lightweight aluminum structures in buildings, aircraft, and as a porous ceramic for water [1,2]. A growing number of applications that require advanced ceramics have appeared in recent decades, especially in environments where high temperatures, extended wear and corrosive environments are present. Such applications include the filtration of molten metals, high temperature insulation, support for catalytic reactions [3], filtration of particulates from exhaust gases of diesel engines and filtration of hot gases in various corrosive industrial processes, for example [4-6]. The advantages of using porous ceramic for these applications are generally a high melting point, suitable electronic properties, good corrosion resistance and wear resistance in combination with the characteristics acquired by the replacement of the solid material by voids in the component. Such characteristics include low thermal mass, low thermal conductivity, permeability control, high surface area, low density, high specific strength and a low dielectric constant [1,7]. These properties can be tailored for each specific application by controlling the composition and microstructure of the porous ceramic [8,9].

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Synthesis of ZrO<sub>2</sub>-Based Ceramics for Applications in SOFC

Cited by 12 publications

References 0 publications

Analysis in vitro of the cytotoxicity of potential implant materials. I: Zirconia‐titania sintered ceramics

Analysis in vitro of the cytotoxicity of potential implant materials. I: Zirconia‐titania sintered ceramics

Room temperature plasticity of zirconia-yttria-titania ceramics: Experimental indications and structural modelling

Al2O3 and Al2O3-ZrO2 Fibers Obtained by Biotemplete with Low Thermal Conductivity

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