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  • 1
    Electronic Resource
    Electronic Resource
    Improved Catalytic Properties of Solid Oxide Fuel Cell (SOFC) Anodes by Coated Ni/YSZ (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 308-311 (May 1999), p. 788-793 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.308-311.788.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure and Interdiffusion Phenomena in YSZ-CGO Composite Electrolyte (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 308-311 (May 1999), p. 794-799 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.308-311.794.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Modelling of Crack Growth Near the Metallic-Ceramic Interface during Thermal Cycling of Air Plasma Sprayed Thermal Barrier Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 333 (Mar. 2007), p. 263-268 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The lifetime under thermal cycling of a system consisting of an air plasma sprayedthermal barrier coating (TBC) deposited on a metallic bondcoat (BC) is determined by the subcriticalgrowth of micro-cracks near the interface between both coatings. This growth mainly occursduring the cooling down phase, as shown by the acoustic emission monitoring during the thermalcycling. The factors controlling the stress level leading to the crack growth are the local curvatureof the metallic-ceramic interface, the growth of an oxide scale (TGO) at such interface and thesintering of the TBC, the two last processes occurring during the high temperature cycle phase.Implementing all these factors, a model based on Finite Element Method (FEM) calculations ispresented where growing cracks are incorporated by assigning soft properties to the FEM cellsoccupied by the cracks. Determining the growth direction for the maximum energy release rate atevery cooling down step, the current crack extension during the cycling is tracked until it reaches acharacteristic length corresponding to the TBC failure. The influence by the metallic-ceramicinterface roughness and by the temperature gradient across the TBC is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.333.263.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Manufacturing of Solid Oxide Fuel Cells - Bridging the Gap from Laboratory to Industry (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1315-1320 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Due to their direct conversion of electrochemical into electrical energy solid oxide fuel cells (SOFCs)have great potential for a future additional energy supply. Even in the last two years numerousdevelopers of SOFCs, both industry and research institutions, have demonstrated long-term stableoperation of stacks of various dimensions (ranging from 1 to 125 kWel, with durations of up to 25000hours of operation). Besides technical proof, single component availability (cells, bipolar plates,sealing…), stable and low-aging operation, as well as cost efficient manufacturing of the componentsis becoming more and more evident in preparation for a market launch.Close cooperation between SOFC stack developers, SOFC users and manufacturers of powders, semifinishedparts or stack components is a prerequisite for success.Within a collaboration project funded by the German Federal Ministry of Economics and Labor(BMWA) the development of an SOFC as an auxiliary power unit (APU) is being promoted. Theindustrial users are BMW for automotive applications and Liebherr for use in construction vehicles oraircraft.The content of this presentation will be the transfer of the manufacturing knowledge developed atResearch Center Jülich to CeramTec; including on the one hand the problems and limitations and, onthe other hand the successes and positive perceptions. In detail, the transfer of, for example tapecasting and screen printing will be addressed, powder characteristics concerning paste or slipformulation and special tests with reference to SOFCs are presented, and single cell tests of variouscells manufactured with different powders or fabrication processes are described.Additionally, some remarks will concern different priorities in either R&D or industry (e.g. R&D:high power density; industry: reproducibility), process windows for manufacturing and the search foralternative fabrication methods
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1315.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Graded High-Porous Microfilters by Powder Metallurgical Coating Techniques (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 308-311 (May 1999), p. 59-64 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.308-311.59.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Production and Densification of Nanosized Cu/SiC-Powders (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 269-272 (Jan. 1998), p. 213-218 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.269-272.213.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Modelling of Thermal Residual Stresses in Graded Ceramic Coatings (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 308-311 (May 1999), p. 930-935 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.308-311.930.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Processing and Properties of Advanced Solid Oxide Fuel Cells (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1367-1372 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Up to now, Solid Oxide Fuel Cell (SOFC) materials and processing does not meet the cost goals forcommercialization. This resulted in a worldwide increase in R&D activities dealing with advancedmaterials and effective manufacturing methods.The present paper describes efforts to process novel SOFC materials as well as optimization of wellknown ones. The R&D trends are explained for key components such as anode, electrolyte, cathode,contact- and protective layers.Typical SOFC manufacturing methods include tape casting, extrusion, calendaring and axialpressing. Each of these techniques has advantages and limitations. Examples for the highly efficientuse of these methods are given for electrolyte supported cells as well as anode and cathode supporteddesigns. An evaluation in reference to automation, process complexity and costs is given under thepresent limiting factors. Exemplary the processing by tape casting and the micro structural finetuning of an advanced anode-supported system is discussed in detail. To produce the layeredcomponents of an SOFC, techniques like screen printing, wet powder spraying, PVD and CVD areunder development. While the layer properties are excellent, PVD and CVD are nowadays tooexpensive in some cases, due to the low deposition rates. If thin layers are required, these techniquesbecome interesting under cost considerations. The effectiveness of a PVD interlayer betweenelectrolyte and high power density cathodes is shown in comparison to a sintered layer.In thin electrolyte concepts, the cathode becomes the power limiting component at operatingtemperatures below around 750°C. Thus new cathode materials and adjusted processing parametersare under development. The possibilities to manufacture advanced cathode layers by screen printing,wet powder spraying and other wet chemical methods are discussed. As an example screen printingof LSCF is described which results in a high power density cathode layer for low temperature SOFCoperation. Finally, future needs to achieve the technical and economic goals are summarized
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1367.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Zirconates as New Materials for Thermal Barrier Coatings (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Zirconates with high melting points were investigated for application as materials for thermal barrier coatings at operating temperatures 〉1300°C. SrZrO3, BaZrO3, and La2Zr2O7 powders were synthesized and sintered to compacts with various levels of porosity. The sintering results indicated a promising low-sintering activity of the investigated materials. Thermal properties of these dense materials were determined. Thermal expansion coefficients were slightly lower than those of Y2O3-stabilized ZrO2 (YSZ); thermal conductivities of SrZrO3 and BaZrO3 were comparable or slightly higher than those of YSZ. La2Zr2O7 had a lower thermal conductivity. SrZrO3 was not suitable for application as a thermal barrier coating because of a phase transition at temperatures between 700° and 800°C. Mechanical properties (hardness, fracture toughness, and Young's modulus) of dense BaZrO3 and La2Zr2O7 samples were determined by indentation techniques and showed lower hardness and Young's modulus compared to YSZ. BaZrO3 and La2Zr2O7 powders were optimized for application as powders for plasma spraying. Plasma-sprayed coatings were produced and characterized. Thermal cycling with a gas burner at 1200°C showed a massive attack of the BaZrO3 coating, with loss of BaO. On the other hand, the La2Zr2O7 coating showed excellent thermal stability and thermal shock behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01506.x
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  • 10
    Electronic Resource
    Electronic Resource
    Processing and Properties of Nanograin Silicon Carbide (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The manufacture of fine-grained SiC ceramics by using nanophase SiC powders with particle sizes of about 20 nm is described. Conventional sintering of these powders led to extreme grain growth and hence the nanophase microstructure was destroyed. Pressure-assisted sintering was applied to reduce the sintering temperature and also grain growth. Hot isostatic pressing (HIPing) of samples with about 1 wt% carbon and 1 wt% boron addition at temperatures below 1700°C and with pressures up to 350 MPa resulted in densities of more than 95% of the theoretical density (TD) and grain sizes of 150 nm. A further reduction of grain size became possible by an optimized high-temperature heat treatment of the samples prior to HIP. This procedure removed at least partially the oxygen layer on the surface of the nanophase SiC particles. Samples with densities of more than 97% TD and grain sizes below 80 nm were produced. Grain sizes were measured with scanning and transmission electron microscopes; both methods gave similar values. Grain sizes determined from the peak broadening of X-ray diffraction peaks showed in some cases lower values. This was attributed to the relatively high amount of twinning boundaries and stacking faults produced during crystal growth. The influence of the grain size on different mechanical and thermal properties was investigated. Vickers hardness and indentation fracture toughness were measured for samples with different densities and grain sizes. The results revealed that besides grain size features like density and/or oxygen content can strongly influence hardness and fracture toughness. Similar results have been found for the wear resistance of fine-grained materials. Results of pin-on-disk type experiments showed the importance of a high density of the samples for high wear resistance. Thermal diffusivity measurements were performed for samples with different grain sizes up to 1400°C. A large decrease with decreasing grain size was found at room temperature. At higher temperatures the difference in the thermal diffusivity of fine- and large-grained materials was reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02127.x
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