scholarly journals Metal-supported SOFC Fabricated by Tape Casting and Its Characterization: A Study of the Co-sintering Process

2021 ◽  
Vol 53 (5) ◽  
pp. 210511
Author(s):  
Zaka Ruhma ◽  
Keiji Yashiro ◽  
Itaru Oikawa ◽  
Hitoshi Takamura ◽  
‪Tatsuya Kawada
Keyword(s):  
Metal Layer ◽  
Tape Casting ◽  
Sintering Process ◽  
Half Cell ◽  
Pore Former ◽  
Metal Support ◽  
Sintered Layer

Metal-supported SOFC consists of metallic and ceramic multilayers. Since the cell has to be flat, interaction between the layers that results in a flat sintered layer needs to be studied. The method used here was changing the starting materials through several experiments. Here, we highlight the effects of pore former in metal slurry on the sintered half-cell multilayer of a 430L metallic support, an NiO-8YSZ anode, and an 8YSZ electrolyte. The results show that by changing the amount of pore former in the 430L metal slurry changed the sinterability of the metal layer. This change of the sinterability of the metal support affected the final warpage state of the cell. This study aid in explaining the sintering phenomena between layers of metal-supported SOFCs.

Influence of pore former on electrochemical performance of fuel-electrode supported SOFCs manufactured by aqueous-based tape-casting

Energy ◽  
2016 ◽  
Vol 115 ◽  
pp. 149-154 ◽  
Author(s):  
Juan Zhou ◽  
Qinglin Liu ◽  
Lan Zhang ◽  
Zehua Pan ◽  
Siew Hwa Chan
Keyword(s):  
Electrochemical Performance ◽  
Tape Casting ◽  
Pore Former

Effect of Adding Sago and Sintering to the Properties of Geopolymer Mortar

2020 ◽  
Vol 1010 ◽  
pp. 659-664
Author(s):  
Mohamad Abdul Zahari Aziz ◽  
M.M.R. Faizal ◽  
Izwan Johari ◽  
Shah Rizal Kasim
Keyword(s):  
Compressive Strength ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Content Increase ◽  
Curing Time ◽  
Sintering Process ◽  
Silicate Mineral ◽  
Pore Former ◽  
X Ray ◽  
Alkaline Activator

Geopolymer is an alternative cementitious material produced by rich Alumino Silicate mineral materials (Si-Al) combine with alkaline activator. The objectives in this study are to introduce pores by using sago as pore former and to determine the effect of curing time and sintering process to geopolymer mortar properties. There are three compositions of mortar used in this study with different sago content (10%, 20%, and 30%) and each composition of mortar have different curing time (1, 3 and 7 days). Fly ash, silica powder, alkaline activator (sodium silicate solution (Na2SiO3) and sodium hydroxide (NaOH) and sago were mixed together based on their composition and the mixture were put into steel cubic mould (50 mm x 50 mm x 50 mm) and left at room temperature for curing process. After the mortar reaches their curing time, it will be sintered at 1000 °C. The physical changes of the mortar were analysed before and after the sintering process. The microstructure of mortar was observed using Scanning Electron Microscope (SEM). Compression test was done to geopolymer mortars by using ADR-Auto 3000 from ELE instrument (ASTM C109 standard) to determine the mechanical properties. Fourier-transform infrared (FTIR) analysis used to determine the functional group exist in geopolymer mortar and X-ray Diffraction (XRD) was used to determine the phase. Besides that, Energy dispersive X-ray spectroscopy (EDX) use to measure percentage elements exist in a mortar. Geopolymer mortar with 10% sago content, 7 days of curing and undergo sintering process have the highest compressive strength (13.46 N) compare to the other geopolymer mortar composition. The 30% sago mortar contain many pores after sintering contributes its brittleness and cannot be tested for compressive strength. Longer curing days give enough time for the geopolymerisation process to create strong Si-O-Al bond or Jadeite (N-A-S-H gels) while sintering process helps to speed up the geopolymerisation process take place in a mortar. Formation of jadeite (N-A-S-H gels) influenced the strength of the mortar. The increasing phase of jadeite increases the strength of the mortar. As sago content increase, the pores in geopolymer also increase but the ratio Al2O3:SiO2 decrease resulting low formation of Jadeite. Hence the compressive strength of geopolymer mortar decrease.

Sintering process for tape casting of piezoelectric ceramics

2019 ◽  
Vol 552 (1) ◽  
pp. 132-139
Author(s):  
P. Plianaek ◽  
W. Bureemat ◽  
M. Sittkankaew ◽  
M. Thammajinda ◽  
O. Hemadhulin ◽  
...  
Keyword(s):  
Tape Casting ◽  
Piezoelectric Ceramics ◽  
Sintering Process

On the preparation of asymmetric CaTi0.9Fe0.1O3−δ membranes by tape-casting and co-sintering process

2009 ◽  
Vol 326 (2) ◽  
pp. 310-315 ◽  
Author(s):  
M.-L. Fontaine ◽  
J.B. Smith ◽  
Y. Larring ◽  
R. Bredesen
Keyword(s):  
Tape Casting ◽  
Sintering Process

scholarly journals Correlation between Concentrations of Ni and Y in Y-Doped BaZrO3 Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate

Membranes ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 95 ◽  
Author(s):  
Donglin Han ◽  
Kenji Kuno ◽  
Tetsuya Uda
Keyword(s):  
Solid Solution ◽  
Clear Correlation ◽  
Sintering Process ◽  
Composite Anode ◽  
Electrolyte Layer ◽  
Half Cell ◽  
Electrolysis Cells ◽  
Anode Substrate ◽  
Cation Ratio

BaZr0.8Y0.2O3-δ (BZY20) is promising to be applied as an electrolyte in fuel cells, electrolysis cells, etc. However, when a half cell composed of a BZY20 electrolyte layer and a BZY20-NiO composite anode substrate is co-sintered (1400–1600 °C), Ni diffuses from the anode substrate into the electrolyte layer. Y content in the electrolyte layer decreases dramatically, since BZY20 cannot be equilibrated with NiO at such high temperature. Such Ni diffusion and Y loss are detrimental to the electrochemical performance of the electrolyte layer. In this work, we added MgO-NiO solid solution into the anode substrate to adjust the NiO activity (aNiO) during the co-sintering process, and used three different co-sintering methods to control the BaO activity (aBaO). The results revealed that by decreasing aNiO in the system, the as-co-sintered electrolyte layer had the composition shifting towards the direction of high Y and low Ni cation ratios. A clear correlation between the intra-grain concentration of Ni and Y was confirmed. In other words, to prepare the electrolyte with the same Y cation ratio, the Ni diffusion into the electrolyte layer can be suppressed by using the MgO-NiO solid solution with a high MgO ratio and a low Ni ratio. Moreover, by increasing aBaO, we found that the Y cation ratio increased and approached the nominal value of the pristine BZY20, when Mg1−xNixO (x = 0.3 and 0.5) was used. In summary, both aNiO and aBaO play important roles in governing the composition of the electrolyte layer prepared by the co-sintering process. To evaluate the quality of the electrolyte layer, both the intra-grain Y and Ni concentrations should be carefully checked.

Elaboration, by tape casting, and thermal characterization of a solid oxide fuel half-cell for low temperature applications

2010 ◽  
Vol 45 (4) ◽  
pp. 491-498 ◽  
Author(s):  
Claire Bonhomme ◽  
Sophie Beaudet-Savignat ◽  
Thierry Chartier ◽  
Caroline Pirovano ◽  
Rose-Noëlle Vannier
Keyword(s):  
Low Temperature ◽  
Tape Casting ◽  
Thermal Characterization ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Half Cell ◽  
Temperature Applications

scholarly journals Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3674
Author(s):  
Mélanie François ◽  
Maria Paola Carpanese ◽  
Olivier Heintz ◽  
Victoire Lescure ◽  
Davide Clematis ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Perovskite Phase ◽  
Tape Casting ◽  
Chemical Degradation ◽  
Doped Ceria ◽  
Sintering Process ◽  
X Ray ◽  
Cell Testing ◽  
Complete Cell ◽  
Degradation Of Materials

A complete cell consisting of NiO-Ce0.8Sm0.2O3−δ//Ce0.8Sm0.2O3−δ//(La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ elaborated by a co-tape casting and co-sintering process and tested in operating fuel cell conditions exhibited a strong degradation in performance over time. Study of the cathode–electrolyte interface after cell testing showed, on one hand, the diffusion of lanthanum from (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ into Sm-doped ceria leading to a La- and Sm-doped ceria phase. On the other hand, Ce and Sm diffused into the perovskite phase of the cathode. The grain boundaries appear to be the preferred pathways of the cation diffusion. Furthermore, a strontium enrichment was clearly observed both in the (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ layer and at the interface with electrolyte. X-ray photoelectron spectroscopy (XPS) indicates that this Sr-rich phase corresponded to SrCO3. These different phenomena led to a chemical degradation of materials and interfaces, explaining the decrease in electrochemical performance.

Co-Sintering of SDC / NiO-SDC Bi-Layers Prepared by Tape Casting

2007 ◽  
Vol 280-283 ◽  
pp. 779-784 ◽  
Author(s):  
Hai Bin Li ◽  
Chang Rong Xia ◽  
Xiao Hong Fan ◽  
Xi He ◽  
Xiaoliang Wei ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Tape Casting ◽  
Open Circuit ◽  
Solid Oxide ◽  
Sintering Process ◽  
Anode Substrate ◽  
Anode Support ◽  
And Control ◽  
Sintering Shrinkage ◽  
Full Densification

In the development of intermediate temperature solid oxide fuel cell (IT-SOFC), the anode supported thin electrolyte with higher conductivity than YSZ is an essential approach in recent years. In this work, we report our route that Ce0.8Sm0.2O1.9 (SDC) as electrolyte and porous NiO-SDC as anode substrate are prepared by a bi-layer tape casting and co-sintering process. The major effort was to adjust and control the shrinkage of the two material layers. It was found that only the specimens with less than 0.1% mismatching of the sintering shrinkage between two layers can result in the flat and crack free samples. In addition, high activity powders were the essential to obtain dense SDC electrolyte. Fuel cells with Sm0.5Sr0.5CoO3 as cathode were tested. The open circuit voltage (OCV) and the power density of the cells confirmed the full densification of the SDC electrolyte on the anode support.

Effect of Copper Micro-Scale Excess on the Dielectric Properties of CaCu3Ti4O12 Ceramics Prepared via Tape Casting

2014 ◽  
Vol 941-944 ◽  
pp. 517-520
Author(s):  
Wei Li ◽  
Zhao Xian Xiong ◽  
Hao Xue ◽  
Chun Xiao Song ◽  
Hong Qiu
Keyword(s):  
Dielectric Properties ◽  
Solid Phase ◽  
Tape Casting ◽  
Temperature Stability ◽  
Liquid Phase Sintering ◽  
Sintering Process ◽  
Micro Scale ◽  
Low Dielectric ◽  
High Dielectric ◽  
Effect Of Copper

CaCu(3+x)Ti4O12 (x = 0, 0.001, 0.002, 0.004 and 0.008) ceramics with variation in copper micro-scale excess were prepared via solid-state reaction, Aqueous technology of tape casting was applied to obtain thick films of, about 100 μm in thickness. Crystal phases of the samples were identified by XRD. SEM of samples revealed that copper micro-scale excess can accelerate some important solid phase reactions in the sintering process, most because of liquid phase sintering mechanism. EDX analysis indicated that copper micro-scale excess could compensate for a lack of copper in sintering process. The Cu3.004 sample exhibited the best dielectric properties with a very low dielectric loss (0.029), while retaining a very high dielectric constant (91,536), and the Cu3.002 and Cu3.004 samples exhibited a well frequency and temperature stability which was of significant industrial relevance. In this work, it was concluded that a certain amount of Cu micro-scale excess could improve dielectric properties, frequency stability and temperature stability of CCTO ceramics.

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