Preparation of Nanostructured Platinum/Yttria-Stabilized Zirconia Cermet by the Sol−Gel Method

1996 ◽  
Vol 35 (12) ◽  
pp. 4479-4486 ◽  
Author(s):  
Hidemoto Shiga ◽  
Tatsuya Okubo ◽  
Masayoshi Sadakata
Keyword(s):  
Sol Gel ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Zirconia Cermet

A facile citric acid assisted sol–gel method for preparing monolithic yttria-stabilized zirconia aerogel

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84280-84283 ◽  
Author(s):  
Zhiyi Zhang ◽  
Qiuyue Gao ◽  
Yi Liu ◽  
Chunmei Zhou ◽  
Mingjia Zhi ◽  
...  
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Environmental Friendly ◽  
Monolithic Zirconia ◽  
Zirconia Aerogel

Citric acid was used as the cheap and environmental friendly gelation accelerator for preparation of monolithic zirconia aerogel.

scholarly journals The Effect of Yttria-Stabilized Zirconia on the Properties of the Fluorine-Substituted Hydroxyapatite Ceramics Prepared by Pressureless Sintering

2008 ◽  
Vol 1 ◽  
pp. 57-68 ◽  
Author(s):  
Y. Chen ◽  
Z. Dong ◽  
X. Miao
Keyword(s):  
Mechanical Properties ◽  
Thermal Decomposition ◽  
Sol Gel ◽  
Yttria Stabilized Zirconia ◽  
Pressureless Sintering ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Zirconia Composites ◽  
Zirconia Phase ◽  
Hydroxyapatite Phase

Hydroxyapatite-zirconia composites have received much attention during the last decade due to their combination of the desirable mechanical properties of zirconia and the excellent bioactivity of hydroxyapatite (HA). However, thermal decomposition of the hydroxyapatite phase and reaction between the zirconia phase and the hydroxyapatite phase remain a major problem in the hydroxyapatite-zirconia composites. In this study, thermally stable and fluorine-substituted hydroxyapatite (Ca10(PO4)6(OH)0.8F1.2; coded as HA06F) was prepared by a sol-gel method to replace the hydroxyapatite. Yttria-stabilized zirconia (YTZP) was also prepared by a sol-gel method in order to produce HA06F-YTZP composites with 5, 10, 15, 20, 40, and 60 wt% YTZP by simple and cost-effective pressureless sintering. Thermogravimetric analysis (TGA) and x-ray diffraction (XRD) of the HA06F-YTZP composites showed that the thermal stability of the HA06F matrices could be maintained when the YTZP content did not exceed 20 wt% and for sintering temperatures less than 1400 oC. Dilatometric analysis and microstructural observation revealed that the YTZP phase in the HA06F-YTZP composites retarded the densification of the composites if the zirconia content was over 20 wt%. Electron scanning microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM) of the HA06F-YTZP composites showed that the YTZP second phase had a size in the nanometer scale and the reaction between the HA06F phase and the zirconia phase was suppressed. Mechanical properties including the Knoop hardness, the Young’s modulus, and the fracture toughness of the HA06F-YTZP composites increased with the YTZP content until the optimal content of 20 wt%; higher YTZP contents led to low mechanical properties due to poor densification of the composites and the severe thermal decomposition of the HA06F phase. The optimal HA06F-20YTZP composite also showed desirable attachment and proliferation of osteoblast cells. Nevertheless, the study of the composite system indicated the limitations of the pressureless sintering technique. To achieve the full potential of the composites for medium or low load bearing applications, a pressure-assisted sintering technique would still be necessary.

Tailoring the properties of yttria-stabilized zirconia powders prepared by the sol–gel method for potential use in solid oxide fuel cells

2011 ◽  
Vol 92 (2) ◽  
pp. 183-189 ◽  
Author(s):  
A. Díaz-Parralejo ◽  
E.M. Cuerda-Correa ◽  
A. Macías-García ◽  
M.A. Díaz-Díez ◽  
J. Sánchez-González
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Sol Gel ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Potential Use ◽  
Zirconia Powders

scholarly journals Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

2020 ◽  
Vol 97 (1) ◽  
pp. 88-96
Author(s):  
E. Sheveleva ◽  
◽  
S. Shevelev ◽  
A. Sokolovskiy ◽  
A.K. Zeinidenov ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Gas Evolution ◽  
Densification Behavior ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Powder Compacts ◽  
Zirconia Powders

Thermal and XRD analyses were used to study partially stabilized zirconia powders produced by sol-gel method in order to investigate gas evolution in annealing in air and densification behavior of these powders in compaction and subsequent sintering. It was found that the powders of the initial gel contain a large amount of gas adsorbates. The amount of adsorbates decreases as the annealing temperature grows. At annealing temperature of 700 ºC, adsorbates are completely removed from the powders and the latter obtain a crystalline structure with a predominant tetragonal phase. Gas adsorbates affect densification of powder compacts during sintering and facilitate the production of ceramics with a porosity of not more than 5 %. It is shown that the production of low porosity ceramics is complicated even though powders subjected to annealing may contain nano-sized impurities or be free of these. Low-melting additives are proposed to be used for ceramics production.

Mixed Potential Type Sensor Using Stabilized Zirconia and La0.75Sr0.25Cr0.5Mn0.5O3 Sensing Electrode for NO2 Detection

2011 ◽  
Vol 287-290 ◽  
pp. 65-68
Author(s):  
Yin Lin Wu ◽  
Hai Yan Zhao ◽  
Lei Dai ◽  
Ling Wang
Keyword(s):  
Electrochemical Sensors ◽  
Sol Gel ◽  
Mixed Potential ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Perovskite Type Oxide ◽  
Extreme Sensitivity ◽  
Perovskite Type ◽  
No2 Detection

Electrochemical sensors based on tubular yttria-stabilized zerconia (YSZ) with the perovskite-type oxide as a sensing-electrode (SE), which is prepared by sol-gel method, were fabricated and examined for NO2 detection in the temperature range 673~973K. The results show that La0.75Sr0.25Cr0.5Mn0.5O3, shows extreme sensitivity to NO2. The EMF varies linearly as a function of the concentration of NO2 (0~ 463 ppm) at 773K.

scholarly journals Characterization of Calcia Stabilized Zirconia as a solid Electrolyte Made through a sol gel Method in Solid Oxide Fuel Cell

2019 ◽  
Vol 9 (1) ◽  
pp. 3056-3060
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Electrolyte ◽  
Sol Gel ◽  
Solid Oxide ◽  
Cubic Phase ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method

Solid Oxide Fuel Cell (SOFC) is a solid-state energy conversion device which produces electricity through the conversion of chemical energy directly to electrical energy. The research was carried out to characterize Calcia Stabilized Zirconia (CSZ) that was made using sol gel method. In this study, the production of CSZ pellets consisted of three steps. First step was the extraction of ZOC (ZrOCl28H2O) and second step was the production of Zr(OH)4 and the last step was dissolution of ZrOH4 into HCl and then adding CaO to get CSZ powder. The CSZ powder was then pressed to form pellets, followed by sintering at 1200 oC for 3 hours. The characterization was conducted using X ray diffraction to analyze the presence of impurities as well as the formation of cubic phase and scanning electron microscope was used to observe the pores in the microstructure. From the XRD data and SEM analysis, it can be concluded that the Calcia Stabilized Zirconia as a solid electrolyte in SOFC using sol gel method gave promising results.

Synthesis and Photocatalytic Property of N-doped BiVO$lt;inf$gt;4$lt;/inf$gt; via Sol-Gel Method Using Corn Stem as Template

2014 ◽  
Vol 29 (8) ◽  
pp. 807
Author(s):  
WANG Min ◽  
NIU Chao ◽  
DONG Zhan-Jun ◽  
CHE Yin-Sheng ◽  
DONG Duo ◽  
...  
Keyword(s):  
Sol Gel ◽  
Photocatalytic Property ◽  
Gel Method ◽  
Sol Gel Method
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