Evaluation of the oxidation and Cr evaporation properties of selected FeCr alloys used as SOFC interconnects

Sachitanand, Rakshith Nugehalli; Sattari, Mohammad; Svensson, Jan‐Erik; Froitzheim, Jan

doi:10.1016/j.ijhydene.2013.09.044

Cited by 180 publications

(78 citation statements)

References 25 publications

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“…Linder et al found that Crofer 22 APU oxide layer thickness was about 5 mm for similar exposure time at 850 C in air[25]. Sachitanand et al found that Crofer 22 APU oxide layer thickness was about 12e16 mm at 850 C in humidified air after 1000 h[29].The results presented in…”

mentioning

confidence: 88%

Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

Thomann¹,

Rautanen²,

Himanen³

et al. 2015

Journal of Power Sources

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h i g h l i g h t sPost-experimental analysis of a SOFC stack after 1800 h of operation. Microstructural analysis of the glass-coated hybrid seal. Materials interactions between glass-coated seals and Crofer 22 APU interconnects. Dual exposure of 0.2 mm thin Crofer 22 APU plates in stack operating conditions. a b s t r a c t A post-experimental analysis of a SOFC stack is presented. The stack was operated for 1800 h at 700 C with air and hydrogen and contained hybrid glass-Thermiculite 866 seals. The goal of this work was to investigate the sealing microstructure and possible corrosion during mid-term operation. It was found that hybrid seals could effectively compensate for manufacturing tolerances of cells and other components due to the compliance of the glass layer. Additionally, different interfaces were investigated for corrosion. Corrosion was not observed at two-phase interfaces such as Crofer 22 APU/glass, glass/electrolyte and glass/Thermiculite 866. The three-phase interface between Crofer 22 APU/glass/hydrogen exhibited no corrosion. Some evidence of non-systematic corrosion was found at the Crofer 22 APU/ glass/air interface. The possible reasons for the corrosion are discussed. Lastly, dual exposure to humid hydrogen and air of the 0.2 mm Crofer 22 APU interconnect had no detrimental effect on the corrosion compared to air exposure. Overall the hybrid seals used in combination with the thin interconnects were found to be a promising solution due to the low leak rate and limited material interactions.

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mentioning

confidence: 88%

Post-experimental analysis of a solid oxide fuel cell stack using hybrid seals

Thomann¹,

Rautanen²,

Himanen³

et al. 2015

Journal of Power Sources

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“…Holcomb and Alman [24] suggested that the alloys containing Ti and Mn reduce further the formation of volatile Cr oxyhydroxide from the scale due to the formation of outer layers of TiO 2 or Cr-Mn spinels. Sachitanand et al [25] reported that higher Mn contents in the steel lead to lower Cr evaporation. When Mn content is high enough, lower Cr volatilisation is observed; nevertheless, higher Mn concentration in the oxide scale shows higher mass gain and the formation of thicker MnCr 2 O 4 spinel layer.…”

Section: Ni-based Alloysmentioning

confidence: 99%

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Dudziak

Deodeshmukh²,

Backert

et al. 2016

Oxid Met

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During the test, no spallation of the external oxide scale was observed. The kinetic data showed that only the 263 alloy oxidized according to parabolic behaviour, whereas the other alloys deviated from the parabolic rate law, with time exponents of 0.4-0.6 or 0.3. Finally, cross-sectioned investigations of the exposed samples revealed that Ni-based alloys underwent extended internal oxidation, with the highest extent in HAYNES Ò 282 Ò reaching 25 lm and the lowest in HAYNES

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“…8(c). It is worth noting that the presence of MneCr oxide layer prevents [16,43] are often applied to the surface of the interconnects to hinder the diffusion [17]and evaporation [20,21] of Cr from the interconnects. However, Mahapatra et al reported the severe reaction between instable (Mn,Co) 3 O 4 spinel coating and sealing glass, which led to the degradation of the interfacial compatibility [43].…”

Section: Glass/metal Interfacial Reactionmentioning

confidence: 99%