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Interaction of a Barium‐Calcium‐Silicate Glass Composite Sealant with Sanergy HT 441
Author(s) -
GrossBarsnick S.M.,
Margaritis N.,
Haart U.,
Huczkowski P.,
Quadakkers W. J.
Publication year - 2019
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201800191
Subject(s) - materials science , composite number , ceramic , layer (electronics) , scanning electron microscope , chromia , composite material , barium , coating , stack (abstract data type) , sealant , oxide , metallurgy , computer science , programming language
The interaction between Sandvik's coated Sanergy HT 441 (EN 1.4509) with a cerium‐cobalt layer as chromium evaporation barrier and a glass‐ceramic composite sealant on the basis of BaO‐CaO‐SiO 2 was investigated in this study. The oxidation behavior of the steel was analyzed by long‐term weight change measurements of strip samples at 800 °C for 10,000 h followed by scanning electron microscopy on cross‐sectioned samples. A double oxide layer was formed consisting of chromia close to the steel and a layer with 18 wt.% Cr, 11% Co, 10% Mn to the air side. The interface of the joined samples had a reaction layer similar to the oxidized steel surface with an additional phase formation consisting of Co/Mn/Fe and low in oxygen facing the glass‐ceramic interface. After these preliminary tests the coated Sanergy HT 441 was integrated as frames into a four layered F10‐stack with 80 cm 2 cell area and was tested for 3,500 h at operation temperature of 700 °C and 0.5 A cm −2 constant current mode followed by 20 thermal cycles between 700 and 200 °C. The stack had shown similar performance and gas‐tightness compared to stacks assembled with Crofer 22 APU. The post‐test characterization had shown adhesive fracture patterns when dismantling the stack parts.

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