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Effect of Atmosphere on Interconnect‐Seal Glass Interaction for Solid Oxide Fuel/Electrolyzer Cells
Author(s) -
Mahapatra Manoj K.,
Lu Kathy
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04020.x
Subject(s) - devitrification , materials science , alloy , metallurgy , oxide , solid oxide fuel cell , impurity , chromia , argon , chromium , microstructure , chemical engineering , crystallization , chemistry , physics , organic chemistry , electrode , anode , atomic physics , engineering
In this study, the interaction of an alkaline earth‐based silicate glass (SABS‐0) with Crofer 22 APU and AISI 441 interconnects has been studied at 800°C for 100 h in argon, air, and H 2 /H 2 O atmospheres in order to understand the effect of atmospheres on the interfacial compatibility. Detailed microstructure, diffusion, and phase analyses show that the interfacial compatibility improves from air, to argon, and to H 2 /H 2 O atmosphere for the Crofer 22 APU alloy and from H 2 /H 2 O, to argon, and to air atmosphere for the AISI 441 alloy. The interfacial compatibility is better for the Crofer 22 APU alloy. Alloy oxidation, elemental interdiffusion, chemical reactions, and glass devitrification occur during the interface formation between the glass and the alloys. The thermal treatment atmospheres mainly affect chromium diffusion and glass devitrification while minor elements influence the oxidation of the alloys and chemical reactions. This work also demonstrates that the high iron content in the AISI 441 alloy is detrimental but the minor impurities such as silicon and aluminum may be beneficial for the interfacial compatibility.