Tape Casting of Anode Supports for Solid Oxide Fuel Cells at Forschungszentrum Jülich
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This contribution describes the development of tape casting for solid oxide fuel cells (SOFCs) anode supports starting with the characterization of the powders and ending with manufacturing of cells for stack testing. After casting the support, full cells were prepared by screen printing and sintering of the functional layers. The results of single‐cell and stack tests of the novel SOFC will be discussed. The new cell showed excellent electrochemical performance in single‐cell tests with more than 1.5 A/cm 2 (800°C, 0.7 V). Furthermore, stack tests showed no significant difference from earlier standard cells when operated at 800°C with a current density of 0.5 A/cm 2 .Keywords:
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In this paper, the sintering behavior of Ni/YSZ anode and YSZ electrolytes fabricated by aqueous tape casting were studied. This study involved tape casing of Ni/YSZ (8 mol% Y2O3 stabilized ZrO2) anode, and co-sintering of anode supports and electrolytes. At last, thickness of 140 mm (after sintering) with uniform microstructure and ~30% porosity anode and thickness of ~10 0m (after sintering) with high density (> 95%) and electrolyte were achieved.
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Fabrication process for anode supported planar PEN of intermediate temperature solid oxide fuel cell (SOFC) was introduced, in which tape casting and screen printing methods were used. Gd_2O_3 doped CeO_2 (GDC) powders were prepared by solid reaction method. Anode tape was produced by tape casting. Electrolyte and cathode were produced by screen printing. The GDC powder's component,thermal expand coefficient, the porosity, density and microstructure of anode and electrolyte were investiga-(ted) .It was shown that an bi-layer with dense thin electrolyte film and porous anode support and with good coherency of the electrolyte film to the anode could be realized after co-sintering the green tape at 1 350℃ by optimizing the power characteristics of the starting materials in the slurry.
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This contribution describes the development of tape casting for solid oxide fuel cells (SOFCs) anode supports starting with the characterization of the powders and ending with manufacturing of cells for stack testing. After casting the support, full cells were prepared by screen printing and sintering of the functional layers. The results of single‐cell and stack tests of the novel SOFC will be discussed. The new cell showed excellent electrochemical performance in single‐cell tests with more than 1.5 A/cm 2 (800°C, 0.7 V). Furthermore, stack tests showed no significant difference from earlier standard cells when operated at 800°C with a current density of 0.5 A/cm 2 .
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The single-chamber solid oxide fuel cell (SOFC) has recently received considerable attention. This type of fuel cell operates in the mixed reactant gas and therefore does not require separation of the fuel and oxidant gases. In this paper we report the anode− and electrolyte-supported configurations of the single chamber SOFC that we have studied. The system based on typical fuel cell composition has been examined: yttrium stabilized zirconia (YSZ) as an electrolyte, nickel/YSZ cermet as an anode, lanthanum strontium manganese oxide (LSM) as a cathode. The cells were prepared by tape-casting and screen-printing techniques. The cathode processing parameters have been correlated with fuel cell performance.
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Al oxide dispersed Ni-Cu porous sintered alloy was fabricated by a tape casting process followed by a sintering process consisting of oxidation and reduction from Ni-45%Cu-5%Al atmized alloy powder. Conditions of the tape casting process and the relationship between sintering temperature and porosity of the sintered alloys were investigated.Metal powder could be tape-casted in the viscosity range of the slurry during 10, 000-20, 000 cps. Thickness of the green compacts was proportional to blade height. Densities of the green compacts were similar to the tap densities of raw powders. After sintering, porosity of the sintered alloy changed little from the green compacts. These results indicated that the porosity (or density) of the sintered alloy made by this fabrication process could be predicted from the tap density data of raw powder materials.
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High‐k LTCC tapes with ultralow sintering temperatures were developed from lead‐free perovskite powders. Lowering of the sintering temperature from 1250°C down to 900°C has been achieved by means of ultrafine ceramic powders in combination with suitable sintering aids. The tape‐casting process has been optimized for ultrafine powders with an enhanced sintering activity. Low‐sintering high‐k tapes of a thickness down to 40 μm, suitable for LTCC processing, were obtained. The sintering behavior of these high‐k tapes has been studied and compared with other LTCC materials. Dielectric properties of the high‐k material have been investigated on a multilayer test structure consisting of up to 20 dielectric layers. After metallization with an Ag conductor, the green tapes were stacked and laminated. Sintering of these multilayer stacks at 900°C gives dense ceramic samples. Permittivities up to 2000 have been obtained, together with low dielectric losses. Material compatibility with several Ag/Au‐thick‐film‐paste systems has been tested.
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Strontium titanate
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Molding (decorative)
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