Bibliografie tematiche / Ag/YSZ

Letteratura scientifica selezionata sul tema "Ag/YSZ"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Ag/YSZ":

Huang, Liang-Wei, Ren-Kae Shiue, Chien-Kuo Liu, Yung-Neng Cheng, Ruey-Yi Lee e Leu-Wen Tsay. "Vacuum Brazing of Metallized YSZ and Crofer Alloy Using 72Ag-28Cu Filler Foil". Materials 15, n. 3 (26 gennaio 2022): 939. http://dx.doi.org/10.3390/ma15030939.

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The study focused on dissimilar brazing of metallized YSZ (Yttria-Stabilized Zirconia) and Crofer alloy using BAg-8 (72Ag-28Cu, wt%) filler foil. The YSZ substrate was metallized by sequentially sputtering Ti (0.5/1 μm), Cu (1/3 μm), and Ag (1.5/5 μm) layers, and the Crofer substrate was coated with Ag layers with a thickness of 1.5 and 5 μm, respectively. The BAg-8 filler demonstrated excellent wettability on both metallized YSZ and Crofer substrates. The brazed joint primarily consisted of Ag-Cu eutectic. The metallized Ti layer dissolved into the braze melt, and the Ti preferentially reacted with YSZ and Fe from the Crofer substrate. The globular Fe2Ti intermetallic compound was observed on the YSZ side of the joint. The interfacial reaction of Ti was increased when the thickness of the metallized Ti layer was increased from 0.5 to 1 μm. Both brazed joints were crack free, and no pressure drop was detected after testing at room temperature for 24 h. In the YSZ/Ti(0.5μ)/Cu(1μ)/Ag(1.5μ)/BAg-8(50μ)/Ag(1.5μ)/Crofer joint tested at 600 °C, the pressure of helium decreased from 2.01 to 1.91 psig. In contrast, the helium pressure of the YSZ/Ti(1μ)/Cu(3μ)/Ag(5μ)/BAg-8(50μ)/Ag(5μ)/Crofer joint slightly decreased from 2.02 to 1.98 psig during the cooling cycle of the test. The greater interfacial reaction between the metallized YSZ and BAg-8 filler due to the thicker metallized Ti layer on the YSZ substrate was responsible for the improved gas-tight performance of the joint.

Xu, Xing Yan, Chang Rong Xia, Shou Guo Huang e Guang Yao Meng. "Intermediate-Temperature Solid Oxide Fuel Cells with Y_0.25Bi_0.75O_1.5-Ag Cathodes". Materials Science Forum 475-479 (gennaio 2005): 1157–60. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1157.

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Composites consisting of silver and yttria-stabilized bismuth oxide (YSB) were fabricated and investigated as cathodes for intermediate-temperature solid oxide fuel cells (SOFCs) with thin electrolyte films of yttria-stabilized zirconia (YSZ). The films were deposited using spin coating with YSZ suspension. Comparison of YSB-Ag and conventional La0.8Sr0.2MnO3 (LSM) based cathodes showed that the YSB-Ag composite has better electrochemical performance; Interfacial polarization resistance of YSB-Ag cathode is 0.13 Ωcm2 at 750oC. Power density of the single cell with YSB-Ag cathode was about 535 mW/cm2 at 750oC, while that with LSM-Sm0.2Ce0.8O1.9 cathode was only 329 mW/cm2.

Truong, Thai Giang, Benjamin Rotonnelli, Mathilde Rieu, Jean-Paul Viricelle, Ioanna Kalaitzidou, Daniel Marinha, Laurence Burel, Angel Caravaca, Philippe Vernoux e Helena Kaper. "Catalytic and Electrochemical Properties of Ag Infiltrated Perovskite Coatings for Propene Deep Oxidation". Catalysts 10, n. 7 (1 luglio 2020): 729. http://dx.doi.org/10.3390/catal10070729.

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This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La0.6Sr0.4Co0.2Fe0.8O3) for propene combustion. A commercial and a synthesized LSCF powder were deposited by screen-printing or spin-coating on dense yttria-stabilized zirconia (YSZ) substrates, an oxygen ion conductor. Equal loadings (50 µg) of Ag nanoparticles were dispersed via drop-casting on the LSCF layers. Electrochemical and catalytic properties have been investigated up to 300 °C with and without Ag in a propene/oxygen feed. The Ag nanoparticles do not influence the electrochemical reduction of oxygen, suggesting that the rate-determining step is the charge transfer at the triple phase boundaries YSZ/LSCF/gas. The anodic electrochemical performances correlate well with the catalytic activity for propene oxidation. This suggests that the diffusion of promoting oxygen ions from YSZ via LSCF grains can take place toward Ag nanoparticles and promote their catalytic activity. The best specific catalytic activity, achieved for a LSCF catalytic layer prepared by screen-printing from the commercial powder, is 800 times higher than that of a pure Ag screen-printed film.

Si, Xiaoqing, Xiaoyang Wang, Chun Li, Tong Lin, Junlei Qi e Jian Cao. "Joining 3YSZ Electrolyte to AISI 441 Interconnect Using the Ag Particle Interlayer: Enhanced Mechanical and Aging Properties". Crystals 11, n. 12 (16 dicembre 2021): 1573. http://dx.doi.org/10.3390/cryst11121573.

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Reactive air brazing has been widely used in fabricating solid oxide fuel/electrolysis cell (SOFC/SOEC) stacks. However, the conventional Ag–CuO braze can lead to (I) over oxidation at the steel interconnect interface caused by its adverse reactions with the CuO and (II) many voids caused by the hydrogen-induced decomposition of CuO. The present work demonstrates that the Ag particle interlayer can be used to join yttria-stabilized zirconia (YSZ) electrolytes to AISI 441 interconnect in air instead of Ag–CuO braze. Reliable joining between YSZ and AISI 441 can be realized at 920 °C. A dense and thin oxide layer (~2 μm) is formed at the AISI 441 interface. Additionally, an interatomic joining at the YSZ/Ag interface was observed by TEM. Obtained joints displayed a shear strength of ~86.1 MPa, 161% higher than that of the joints brazed by Ag–CuO braze (~33 MPa). After aging in reducing and oxidizing atmospheres (800 °C/300 h), joints remained tight and dense, indicating a better aging performance. This technique eliminates the CuO-induced issues, which may extend lifetimes for SOFC/SOEC stacks and other ceramic/metal joining applications.

Kenjo, T., e H. Takiyama. "Oxygen permeation in Ag/YSZ air cathodes". Electrochimica Acta 39, n. 18 (dicembre 1994): 2685–92. http://dx.doi.org/10.1016/0013-4686(94)00307-6.

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Saito, Y., Y. Imamura e A. Kitahara. "Optical properties of YSZ implanted with Ag ions". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 206 (maggio 2003): 272–76. http://dx.doi.org/10.1016/s0168-583x(03)00743-2.

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Kaneko, Hiroyuki, Hitoshi Taimatsu, Yosuke Miyoshi, Kazunori Kawanaka e Taisuke Kusano. "YSZ/Ag potentiometric sensor for reducing gas detection". Sensors and Actuators B: Chemical 13, n. 1-3 (maggio 1993): 151–54. http://dx.doi.org/10.1016/0925-4005(93)85348-e.

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Usami, Toru, Noboru Akao, Nobuyoshi Hara e Katsuhisa Sugimoto. "Response Characteristics of YSZ Oxygen Sensor with a Ag·YSZ Composite Thin Film Electrode". Journal of the Japan Institute of Metals 65, n. 10 (2001): 916–21. http://dx.doi.org/10.2320/jinstmet1952.65.10_916.

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Zhu, Liangzhu, e Anil V. Virkar. "Sodium, Silver and Lithium-Ion Conducting β″-Alumina + YSZ Composites, Ionic Conductivity and Stability". Crystals 11, n. 3 (16 marzo 2021): 293. http://dx.doi.org/10.3390/cryst11030293.

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Na-β″-alumina (Na2O.~6Al2O3) is known to be an excellent sodium ion conductor in battery and sensor applications. In this study we report fabrication of Na- β″-alumina + YSZ dual phase composite to mitigate moisture and CO2 corrosion that otherwise can lead to degradation in pure Na-β″-alumina conductor. Subsequently, we heat-treated the samples in molten AgNO3 and LiNO3 to respectively form Ag-β″-alumina + YSZ and Li-β″-alumina + YSZ to investigate their potential applications in silver- and lithium-ion solid state batteries. Ion exchange fronts were captured via SEM and EDS techniques. Their ionic conductivities were measured using electrochemical impedance spectroscopy. Both ion exchange rates and ionic conductivities of these composite ionic conductors were firstly reported here and measured as a function of ion exchange time and temperature.

Kim, J. Y., J. S. Hardy e K. S. Weil. "Silver-copper oxide based reactive air braze for joining yttria-stabilized zirconia". Journal of Materials Research 20, n. 3 (1 marzo 2005): 636–43. http://dx.doi.org/10.1557/jmr.2005.0088.

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We investigated a new method of ceramic-to-metal joining, referred to as reactive air brazing, as a potential method of sealing ceramic components in high-temperature electrochemical devices. Sessile drop wetting experiments and joint strength testing were conducted using yttria stabilized zirconia (YSZ) substrates and CuO–Ag-based air brazes. Results from our studies indicate that the wettability of the braze improves substantially with increasing CuO content, over a compositional range of 1–8 mol% CuO, which is accompanied by an increase in the bend strength of the corresponding brazed YSZ joint. The addition of a small amount of TiO2 (0.5 mol%) to the CuO–Ag braze further improves wettability due to the formation of a titanium zirconate reaction product along the braze/substrate interface. However, with one notable exception, the bend strength of these ternary braze joints remained nearly identical to those measured in comparable binary braze joints. Scanning electron microscopy analysis conducted on the corresponding fracture surfaces indicated that in the binary braze joints, failure occurs primarily at the braze/YSZ interface. Similarly in the case of the ternary, TiO2-doped brazes joint failure occurs predominantly along the interface between the braze filler metal and the underlying titanium zirconate reaction layer.

Più fonti

Tesi sul tema "Ag/YSZ":

Gilbert, Benjamin. "Synthèse de films nanocomposites Ag/YSZ, Ag/CGO & Ag(Cu)/CGO par pulvérisation cathodique magnétron réactive pour l’électrocatalyse de l’éthylène en oxyde d’éthylène". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0257.

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L’oxyde d’éthylène (OE) est un précurseur de nombreuses réactions de chimie fine. Il est produit par la réaction d’époxydation de l’éthylène sur un catalyseur à base d’argent. Néanmoins, afin d’atteindre des sélectivités élevées, le procédé industriel utilise des additifs chlorés dans la phase gaz peu écologiques et des modérateurs alcalins sur le catalyseur. L’objectif de cette étude est d’augmenter la sélectivité vers OE sans utilisation de promoteurs chlorés grâce à des électrocatalyseurs Ag/oxydes à structure fluorite synthétisés en couche mince par pulvérisation cathodique magnétron en atmosphère réactive à haute pression. Durant les tests de catalyse les électrocatalyseurs ont été polarisés dans des cellules en configuration 3 électrodes dédiées à la promotion électrochimique de la catalyse, EPOC. Trois systèmes poreux (Ag/YSZ, Ag/CGO & Ag(Cu)/CGO) ont été développés par pulvérisation cathodique magnétron. Le film Ag/YSZ 4 Pa 25 mA présente une microstructure botryoïde caractéristiques d’une séparation des charges d’argent et de la matrice YSZ. Le film nanocomposite Ag/CGO 4 Pa 70 mA présente une morphologie ouverte de type cerveau avec des nano porosités débouchantes. Enfin, le film Ag(Cu)/CGO 4 Pa 70 mA est constitué de nanofils hydrophobes multiphasés entropique. Durant les tests en conditions d’époxydation de l’éthylène en milieu réducteur, le film Ag/CGO 4 Pa 70 mA a présenté un maximum de sélectivité vers OE de 16,55 % à 220 °C et, sous polarisation, la sélectivité a pu être augmentée de 2,78 % sans modification de la vitesse de réaction par effet NEMCA
Ethylene oxide (EO) is an essential building block for the chemical industry. It is produced by the ethylene epoxidation reaction over a silver-based catalyst. Nevertheless, to achieve high selectivity, industrial processes use chloride additives in the gas phase and alkaline moderators on the catalyst. The aim of this study is to increase EO selectivity without chloride additives thanks to Ag/fluorite oxides electrocatalysts synthesized by reactive magnetron sputtering and incorporated in a 3-electrodes configuration cell designed for electrochemical promotion of catalysis, EPOC. Three porous systems (Ag/YSZ, Ag/GDC, Ag(Cu)/GDC) have been synthesized by reactive magnetron sputtering. Ag/YSZ 4 Pa 25 mA nanocomposite thin film exhibits a botryoidal microstructure characteristic of silver segregation inside the YSZ matrix. Ag/GDC 4 Pa 70 mA nanocomposite thin film exhibits a brain like-morphology with open nanoporosities. Ag(Cu)/GDC 4 Pa 70 mA nanocomposite thin film consists of multi-phase hydrophobic entropic nanowires. During catalytic tests under ethylene epoxidation conditions in reducing medium, Ag/GDC 4 Pa 70 mA showed the maximum EO selectivity of 16.55 % at 220 °C and, under polarization, selectivity boost of 2.78 % occur without the appearance of NEMCA effect

Kitenge, Denis. "Optical detection of CO and H2 based on surface plasmon resonance with Ag-YSZ, Au and Ag-Cu nanoparticle films". Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/2047.

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Silver, gold, and copper metallic nanoparticle films have been utilized in various MEMS devices due to not only their electrical but also their optical properties. The focus of this research is to study the detection at room temperature of carbon monoxide (CO) and hydrogen (H2) via Surface Plasmon Resonance (SPR) phenomenon of silver-embedded Yttrium Stabilized Zirconium (Ag-YSZ) nanocomposite film, gold (Au) nanoparticle film, and an alloy film of silver-copper (Ag-Cu) , grown by the Pulsed Laser Deposition (PLD). To determine the appropriate film materials for quick and accurate CO and H2 detection at room temperature with the PLD technique, the growth process was done repeatedly. Optical tools such as X-Ray Diffraction, Alpha Step 200 Profilometer, Atomic Force Microscopy, and Scanning Electron Microscopy were used to characterize thin films. The gas sensing performance was studied by monitoring the SPR band peak behavior via UV/vis spectrophotometer when the films were exposed to CO and H2 and estimating the percent change in wavelength. The metallic nanoparticle films were tested for concentration of CO (100 to 1000 ppm) and H2 (1 to 10%). Silver based sensors were tested for the cross-selectivity of the gases. Overall the sensors have a detection limit of 100 ppm for CO and show a noticeable signal for H2 in the concentration range as low as 1%. The metallic films show stable sensing over a one-hour period at room temperature. The SPR change by UV/vis spectrophotometer shows a significant shift of 623 nm wavelength between 100 ppm CO gas and dry air at room temperature for the alloy films of Ag-Cu with a wider curve as compared to silver and gold films upon their exposure to CO and H2 indicating an improvement in accuracy and quick response. The results indicate that in research of CO and H2 detection at room temperature, optical gas sensors rather than metal oxide sensors are believed to be effective due to not only the absence of chemical involvement in the process but also the sensitivity improvement and accuracy, much needed characteristics of sensors when dealing with such hazardous gases.

Kitenge, Denis. "Optical detection of CO and H₂ based on surface plasmon resonance with Ag-YSZ, Au and Ag-Cu nanoparticle films". [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003296.

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Atti di convegni sul tema "Ag/YSZ":

Choi, Yeon-Bin, Jeong-Hun Son, Dong Gyu Lee e Dong-Sik Bae. "Fabrication and characterization of Ag doped YSZ thin film for antibacterial activity". In THE 3RD INTERNATIONAL CONFERENCE ON MECHANICS, MATERIALS AND STRUCTURAL ENGINEERING 2018 (ICMMSE2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5047120.

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von Niessen, Konstantin, e Malko Gindrat. "Vapor Phase Deposition Using a Plasma Spray Process". In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22640.

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Plasma spray - physical vapor deposition (PS-PVD) is a low pressure plasma spray technology recently developed by Sulzer Metco AG (Switzerland) to deposit coatings out of the vapor phase. PS-PVD is developed on the basis of the well established low pressure plasma spraying (LPPS) technology. In comparison to conventional vacuum plasma spraying (VPS) and low pressure plasma spraying (LPPS), these new process use a high energy plasma gun operated at a work pressure below 2 mbar. This leads to unconventional plasma jet characteristics which can be used to obtain specific and unique coatings. An important new feature of PS-PVD is the possibility to deposit a coating not only by melting the feed stock material which builds up a layer from liquid splats but also by vaporizing the injected material. Therefore, the PS-PVD process fills the gap between the conventional physical vapor deposition (PVD) technologies and standard thermal spray processes. The possibility to vaporize feedstock material and to produce layers out of the vapor phase results in new and unique coating microstructures. The properties of such coatings are superior to those of thermal spray and electron beam - physical vapor deposition (EB-PVD) coatings. In contrast to EB-PVD, PS-PVD incorporates the vaporized coating material into a supersonic plasma plume. Due to the forced gas stream of the plasma jet, complex shaped parts like multi-airfoil turbine vanes can be coated with columnar thermal barrier coatings using PS-PVD. Even shadowed areas and areas which are not in the line of sight to the coating source can be coated homogeneously. This paper reports on the progress made by Sulzer Metco to develop a thermal spray process to produce coatings out of the vapor phase. Columnar thermal barrier coatings made of Yttria stabilized Zircona (YSZ) are optimized to serve in a turbine engine. This includes coating properties like strain tolerance and erosion resistance but also the coverage of multiple air foils.