Variation of Microstructure and Area Specific Resistance with Surface Roughness of a Ferritic Stainless Steel after Long-Term Oxygen Exposure

2015 ◽  
Vol 53 (4) ◽  
pp. 270-276 ◽  
Author(s):  
Myoung Youp Song ◽  
Daniel R. Mumm
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Specific Resistance ◽  
Oxygen Exposure ◽  
Area Specific Resistance

scholarly journals Change in the Microstructure of Ferritic Stainless Steel with Surface Roughness and the Number of Thermal Cycles

2021 ◽  
Author(s):  
Myoung Youp SONG
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Oxide Layer ◽  
Ferritic Stainless Steel ◽  
Exposure Time ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Thermal Cycles ◽  
Total Oxygen ◽  
Oxygen Exposure

One of the candidates for metallic interconnects of solid oxide fuel cells is ferritic stainless steel, Crofer 22 APU. Ferritic stainless steel Crofer 22 APU specimens with different surface roughness were prepared by grinding with SiC powder papers of various grits and then thermally cycled in air. Variation in the microstructure of the samples having different roughness with thermal cycling was investigated. Polished Crofer 22 APU specimens after three and five thermal cycles had relatively flat oxide layers with thicknesses of about 13.8 and 17.9 μm, respectively. Micrographs of a trench made by milling with FIB (focused ion beam) for a Crofer 22 APU specimen ground with grit 80 SiC powder paper after 8 thermal cycles (total oxygen exposure time of 200 h at 1073 K), captured by ESB (energy selective back-scattering) and SE2 (type II secondary electrons), showed that the surface of the sample was very coarse and its oxide layer was undulated. In the oxide layer, the phase of the sublayer was Cr2O3, and that of the top layer was (Cr, Mn)3O4 spinel. The surface of the sample ground with grit 80 SiC powder paper was very rough after 60 thermal cycles (total oxygen exposure time of 1500 h at 1073 K). The polished Crofer 22 APU is a better applicant to an interconnect of SOFC than those with rougher surfaces.

scholarly journals Effect of spinel and perovskite coatings on the long term oxidation of a ferritic stainless steel in H2/H2O atmosphere

2019 ◽  
Vol 148 ◽  
pp. 251-263 ◽  
Author(s):  
M.R. Ardigo-Besnard ◽  
I. Popa ◽  
S. Chevalier
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel

Effect of infiltrated transition metals on nickel morphology change and area-specific resistance of Ni-YSZ based SOFC anode during long-term operation

2015 ◽  
Vol 35 (1-4) ◽  
pp. 81-89 ◽  
Author(s):  
Muhammad Shirjeel Khan ◽  
Seung-Bok Lee ◽  
Rak-Hyun Song ◽  
Jong-Won Lee ◽  
Tak-Hyoung Lim ◽  
...  
Keyword(s):  
Transition Metals ◽  
Specific Resistance ◽  
Term Operation ◽  
Morphology Change ◽  
Sofc Anode ◽  
Area Specific Resistance
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