K44M ferritic stainless steel as possible interconnect material for SOFC stack operating at 600 °C: Characterization of the oxidation behaviour at early working stages

Piccardo, Paolo; Anelli, Simone; Bongiorno, Valeria; Spotorno, Roberto; Repetto, Luca; Girardon, P.

doi:10.1016/j.ijhydene.2015.01.083

Cited by 21 publications

(18 citation statements)

References 45 publications

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“…The scale formed over the steel surface was mainly made of Cr 2-x Fe x O 3 and (Cr,Mn) 3 O 4 , in agreement with other studies (9)(10)(11)(12)(13) and comparable with the "as-received" Crofer 22 APU under the compositional point of view as expected since similar experimental conditions have been applied in term of gas flow, temperature and current load. The EDX map showed the tendency of inhomogeneous chromium distribution along the contacting material with the formation of agglomerated phases.…”

Section: Discussionsupporting

confidence: 90%

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Spotorno

Piccardo

Perrozzi³

2015

ECS Trans.

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In this work the oxidation of Crofer 22 APU and its interaction with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) applied as contacting layer have been investigated in air at 750°C under a current load of 0.5 Acm -2 with the aim to reproduce as close as possible the interconnect interface in real operating conditions. The effects of such interaction and of the pre-oxidation treatment have been studied by means of ASR measurement and post-experiment characterizations. The behavior of such samples has been compared with the results on a working Crofer 22 APU bipolar plate tested as cathode current collector of an anode-supported cell reproducing the stack cathode compartment conditions.

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Section: Discussionsupporting

confidence: 90%

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Spotorno

Piccardo

Perrozzi³

2015

ECS Trans.

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“…The bipolar plate aged in contact with the cathode material of the anode-supported cell allowed to confirm the post-experiment results of the previously described samples. The scale formed over the steel surface was mainly made of Cr 2-x Fe x O 3 and (Cr,Mn) 3 O 4 , in agreement with other studies (9)(10)(11)(12)(13) and comparable with the "as-received" Crofer 22 APU under the compositional point of view as expected since similar experimental conditions have been applied in term of gas flow, temperature and current load. The EDX map showed the tendency of inhomogeneous chromium distribution along the contacting material with the formation of agglomerated phases.…”

Section: Discussionsupporting

confidence: 90%

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Spotorno,

Piccardo,

Perrozzi

2015

Meet. Abstr.

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“…The two samples are clearly distinguished, and the higher reactivity of GB polished specimen could be justified by both the higher defects density and the smaller grain size on GB samples. It is, however, worth to note that: 1) the recrystallization process occurs in the range 500-600°C (i.e., 1/3 of the melting point) after the recovery process (i.e., dislocations of opposite sign reciprocal annihilation preceding the nucleation of recrystallization) which happens at even lower temperature; 2) as previously published [33], below 600°C the formation of TGO on the surface of such FSS is very low and corresponds to a diffused nanoscopic layer with some crystals mainly sporadically distributed on the surface. According to these details one can assume that the samples recrystallize during the first step of the thermal treatment (Fig.…”

Section: Discussionmentioning

confidence: 66%

“…This paper arises from the results achieved by the authors [33]. In this work, the aging according to different thermal cycles of many 'as-rolled' K44M-based sheets with two thicknesses (0.6 and 1.5 mm) and different surface roughnesses (higher in the case of the thinner foils because of the further rolling process) highlighted that: a double scale with an inner chromia-rich subscale and an outer (Mn,Cr) 3 O 4 spinel layer are formed; the latter is continuous in the case of thin samples and discontinuous in the case of the thick ones [33].…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Finishing on High-Temperature Oxidation of AISI Type 444 Ferritic Stainless Steel Used in SOFC Stacks

Bongiorno

Piccardo

Anelli

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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This research is focused on the study of the samples, approximatively 15 9 30 mm 2 sized, that were mechanically cut from two sheets (0.4 and 0.2 mm thick, respectively) of AISI 444 Type ferritic stainless steel (FSS) (DIN 1.4521, Eu designation X2CrMoTi18-2); this material was in the 'as-rolled' state. Part of these specimens were treated superficially on one side using abrasive SiC papers with different average grit sizes (i.e., 46.2, 30.2, 18.3 lm) and diamond suspension (up to 1 lm) in order to obtain various surface roughness. Both the 'as-rolled' and superficially treated samples were then aged in a muffle furnace in static air according to a thermal cycle corresponding to the curing phase of an experimental glass used as sealing in the solid oxide fuel cell stacks. After aging, the chemical compositions and morphological peculiarities of the scale formed depending on the thickness of the samples and their surface state were studied by scanning electron microscopy, energy-dispersive spectroscopy, micro-Raman spectroscopy, bright field light optical microscopy. The obtained results show that all scales formed consist of an inner Cr 2 O 3 subscale and an outer (Mn,Cr) 3 O 4 spinel layer; the relationship between FSS grain size and scale microstructural features is consistent on the samples with mirror-like surface only; the scale thicknesses on SiC grinded samples are comparable; the scales covering the 'as-rolled' surfaces are morphologically similar to those grown on the surfaces finished with the 30.2 and 18.3 lm SiC papers, and their thicknesses show an intermediate situation between the abraded and the mirror-like specimens. The last described characteristics depend mainly on the surface and microstructural peculiarities resulting from the rolling process.

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K44M ferritic stainless steel as possible interconnect material for SOFC stack operating at 600 °C: Characterization of the oxidation behaviour at early working stages

Cited by 21 publications

References 45 publications

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Interaction between Crofer 22 APU Current Collector and LSCF Cathode Contacting Layer under Cell Operation

Influence of Surface Finishing on High-Temperature Oxidation of AISI Type 444 Ferritic Stainless Steel Used in SOFC Stacks

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