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Showing 1 to 17 of 17 for “"Hochtemperaturkorrosion"”.
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Development of protective coatings to improve high temperature corrosion resistance in chlorine containing environments based on an advanced corrosion risk assessment tool
The presence of chlorine in several areas of chemical industry, as well as in waste incinerators or plastic/polymer decomposition mills, may significantly reduce the life-time of the plant components due to its significant corrosivity potential. The development of protective metallic coatings is …
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Untersuchungen zur oxidationsbedingten Lebensdauer von Chromstählen für die Anwendung in der Hochtemperaturbrennstoffzelle (SOFC)
The increasing energy consumption of future automobiles should be covered by a solid oxide fuel cell (SOFC) used as an additional energy supply (auxiliary power unit). The application of a SOFC with about 5 kW power in cars requires small size, low weight and an economic fabrication. To achieve …
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Effects of metallurgical chemistry and service conditions on the oxidation limited life time of FeCrAl-based components
FeCrAl alloys are high temperature structural materials with ever increasing technological importance, because in the temperature range of 900-1300°C their resistance against environmental attack exceeds that of other metallic materials. This is due to the formation of a protective alumina scale on …
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Effect of geometry and composition of Cr steels on oxide scale properties relevant for interconnector applications in Solid Oxide Fuel Cells (SOFCs)
A number of high-Cr ferritic steels have been investigated as possible construction materials (interconnectors) for Solid Oxide Fuel Cells (SOFCs). The mentioned materials have the advantage of a higher electronic conductivity, lower cost and easier fabrication than so far used lanthanum …
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Performance of metallic and carbon based materials under the influence of intense transient energy deposition
Intense energy is deposited on localized areas of the plasma facing materials under transient thermal loads such as edge localized modes (ELMs), plasma disruptions or vertical displacement events (VDEs) in a magnetic confined fusion reactor. Crack formation, thermal erosion and redeposition mainly …
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High temperature corrosion in gas turbines : thermodynamic modelling and experimental results
The introduction of new materials as well as the improvements in fuel quality have raised a need for re-evaluation of the hot corrosion risk in industrial gas turbines. In this study, the risk of hot corrosion was determined using thermodynamic modelling for different impurity-contents and …
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Ferritic steel interconnectors and their interactions with Ni base anodes in solid oxide fuel cells (SOFC)
In recent years high Cr ferritic steels such as Crofer 22 APU became the most widespread construction materials for solid oxide fuel cell (SOFC) interconnects mainly due to low cost and the ease of fabrication compared to ceramic materials. It was shown that optimum properties with respect to oxide …
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Einfluss der Bondcoatzusammensetzung und Herstellungsparameter auf die Lebensdauer von Wärmedämmschichten bei zyklischer Temperaturbelastung
In the present study the influence of the bond coat composition on the lifetime of thermal barrier coatings during thermal cycling was investigated. The knowledge, that the reactive elements (RE), which are essential for the improvement of the oxide scale adhesion, are “lost”, during the bond coat …
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Thermodynamische und kinetische Untersuchungen zur Korrosion von Fe, Ni und Cr, sowie ausgewählten Legierungen bei Gegenwart eines geschmolzenen KCl - ZnCl 2-Eutektikums
In the presence of heavy metal containing chloride melts, metallic materials show a strongly accelerated corrosion. In this work, the influences of the elements Fe, Cr, Ni and Si and the partial pressures of O2 and HCl on the salt melt-induced high temperature corrosion have been studied, as well …
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Einbindung von Alkalimetallen bei der Druckkohlensstaubfeuerung
The pressurized pulverized coal combustion (PPCC) is a concept for coal-based combined cycles with efficiencies > 50%, in which the gases from the coal combustion are used to drive a gas turbine. A mayor problem of the PPCC is the high alkali content of the hot flue gases. The alkalis released …
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Untersuchungen zur Hochtemperaturchemie quecksilberfreier Metallhalogenid-Entladungslampen mit keramischem Brenner
The development of mercury-free metal halide lamps requires a modification of the burner vessel design and of the metal halide filling, compared to mercury-containing lamp types. Metal halides as NaI, TlI, DyI3 are added to discharge lamps in order to achieve a line-rich emission spectrum, …
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Effect of water vapour on growth and adherence of chromia scales on pure chromium
The oxidation behaviour of chromium was studied in the temperature range 950 to 1050oC. A number of atmospheres such as Ar-O2, Ar-H2-H2O, and more complex N2-O2-H2O and N2-H2-H2O were used, to allow the effects of oxygen and water vapour partial pressures to be determined. It was shown that the …