Interconnects

Hilpert, K.; Quadakkers, Willem J.; Singheiser, L.

doi:10.1002/9780470974001.f308084

Cited by 3 publications

(3 citation statements)

References 63 publications

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“…Inter-diffusion tests are initially performed with a single Ni mesh and steel plate to understand the long term behavior in a simulated anode gas atmosphere (Ar + 4%H 2 + 2%H 2 O) at 800 °C up to 3000 h. Samples of interconnect steel materials Crofer 22 APU and Crofer 22 H, whose compositions are shown in Table 1, were in the dimensions of 20x50x1 mm 3 . The contact between the Ni-mesh and steel was accomplished by spotwelding.…”

Section: Sample Schemementioning

confidence: 99%

Long Term Resistivity Behavior of SOFC Interconnect/Ni-Mesh/Anode Interfaces

et al. 2013

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Contact resistances between Crofer 22 APU and Crofer 22 H interconnect plates, Ni mesh and Ni-8YSZ anode interfaces were measured under an anode gas atmosphere (97%H 2 + 3%H 2 O) at 700 °C and 800 °C and current densities of 0 and 0.7 A/cm 2 for durations up to 3000 hours using the 4-point DC conductivity technique. Phase transformations within the steel samples close to the interface due to inter-diffusion of elements (Ni, Fe, Mn and Cr) were observed and analyzed. These phase transformations and the formation of oxide scales on steel as well as nickel mesh surface and grain boundaries do not seem to substantially affect the measured contact resistance with time.

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Section: Sample Schemementioning

confidence: 99%

Long Term Resistivity Behavior of SOFC Interconnect/Ni-Mesh/Anode Interfaces

et al. 2013

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“…In literature, cobalt is oxidized to CoO and it is stable in air at ambient temperature and above 900 o C. However, it is transformed into the black Co 3 O 4 if heated at 600-700 o C. Co 3 O 4 has the normal spinel structure of (6). (CoMnCr)O 4 might be determined as (Mn x Co 2-x )CrO 4 because manganese has hardly any solubility in chromia, even though Cr/Mn/spinel layer is mostly found in the outer layer of the surface oxide on ferritic stainless steels(7).…”

mentioning

confidence: 99%

Characteristics of a Protective Coating on Metal Interconnect for SOFCs

et al. 2009

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We investigated the influences of metallic coating of cobalt deposited on the ferritic stainless steel, SUS 444, by electrodeposition. Cobalt electrodeposited sample revealed a lower area specific resistance value than that of uncoated at 800°in air and showed efficient retention capability of chromium evaporation. Also, cobalt was oxidized to CoCo2O4 and mixed oxide spinels after 1000h at 800° in air.

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“…As the operating temperature of a SOFC is typically about 800°C, it is a difficult task to find an appropriate interconnect material which will satisfy all of the above stringent requirements. Doped LaCrO 3 [1][2][3][4] has been widely explored as a ceramic interconnect material for high-temperature SOFCs, operating between 800 and 1000°C. Its brittleness, high cost, and difficulty in manufacturing complex shapes have been the principal shortcomings of this material for application in a planar SOFC.…”

mentioning

confidence: 99%

Oxygen Transport Resistant and Electrically Conductive Perovskite Coatings for Solid Oxide Fuel Cell Interconnects

Pattarkine

Dasgupta

Virkar

2008

J. Electrochem. Soc.

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Samples of undoped LaMnO 3 ͑LM͒, Sr-doped LaMnO 3 ͑LSM͒, and Ti-doped LaMnO 3 ͑LTM͒ were fabricated by conventional solid-state ceramic processing methods. The objective of Ti doping was to suppress oxygen vacancy concentration/ion transport, while doping with Sr was to enhance oxygen vacancy concentration/ion transport in relation to undoped LM. Total conductivity, mainly electronic, was measured between 500 and 800°C in air. Coatings of LSM, LM, and LTM, 1 m thick, were deposited on Haynes 230 ͑H230͒ foils by sputtering. Uncoated and coated H230 samples were oxidized in air at 800°C for up to 1080 h. Oxidation kinetics of uncoated and coated samples was studied by measuring oxide scale thickness as a function of time. In all coated samples, oxide scale formed under the coating. All coatings were found to suppress oxidation kinetics. Of the materials studied, LTM was the most protective while LSM was the least protective, in accord with defect chemistry, LTM with the lowest oxygen vacancy concentration and LSM with the highest. Area specific resistance ͑ASR͒ measurements showed that LTM-coated samples exhibited the lowest ASR, while the uncoated ones exhibited the highest ASR, again in accord with defect chemistry. A 15 m LTM coating should be sufficient to ensure a 40,000 h interconnect life at 800°C. A comparison of LTM coating to Mn-Cr-spinel of earlier work shows that LTM coating is ϳ23 times more effective than spinel coating in suppressing oxidation kinetics.

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Interconnects

Cited by 3 publications

References 63 publications

Long Term Resistivity Behavior of SOFC Interconnect/Ni-Mesh/Anode Interfaces

Long Term Resistivity Behavior of SOFC Interconnect/Ni-Mesh/Anode Interfaces

Characteristics of a Protective Coating on Metal Interconnect for SOFCs

Oxygen Transport Resistant and Electrically Conductive Perovskite Coatings for Solid Oxide Fuel Cell Interconnects

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