Seal glass compatibility with bare and (Mn,Co)_3O_4 coated AISI 441 alloy in solid oxide fuel/electrolyzer cell atmospheres

摘要

To understand seal glass compatibility with interconnect materials in solid oxide fuel/ electrolyzer cell environments, a SrO-La_2O_3-Al_2O_3-SiO_2 (SABS-O) seal glass is bonded with bare AISI 441 alloy and (Mn,Co)_3O_4 coated AISI 441 alloy; the bonded samples are thermally treated in air and H_2/H_2O atmospheres at 800 ℃ for 1000 h. Alloy oxidation, diffusion of the AISI 441/SABS-0 sample elements, chemical reaction, (Mn,Co)_3O_4 coating stability, and SABS-0 glass devitrification contribute to the interfacial interaction. The interfacial compatibility with the bare AISI 441 alloy is better than with the (Mn,Co)_3O_4 coated AISI 441 alloy. The thermal treatment atmospheres have no significant effect on the interfacial stability for the bare AISI 441alloy. For the (Mn,Co)_3O_4 coated AISI 441 alloy, the interfacial stability is better in the H_2/H_2O atmosphere.