The two braze alloys TiCuNi® and Silver-ABA® were tested as possible candidates for seals in SOFC or SOEC stacks. The different Ti amount in the samples allowed an evaluation of Ti as a matrix filler and as an active metal/wetting agent in brazing alloys. The sealing ability towards ferritic steel and yttria-stabilized-zirconia (YSZ) was investigated. After the sealing process steel/braze/YSZ joints were further annealed in oxidizing (Air) or reducing (9% H2 in Ar) atmospheres at 750 °C for 150 h. The boundaries of the braze and the joining partners for as-sealed and annealed samples were examined with SEM/EDS. XRD and EXAFS were used to characterize reaction products after the annealing process. Based on these results and taking before reported data into consideration, the advantages and disadvantages of Ti containing seals and the role of Ti in failure mechanism are discussed. Even if the use of Ti in active brazing alloys has its benefits, the disadvantages caused by Ti and its reaction products strongly suggest the use of Ti free brazes in SOFC/SOEC applications.
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ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology
June 14–16, 2010
Brooklyn, New York, USA
Conference Sponsors:
- Advanced Energy Systems Division
ISBN:
978-0-7918-4405-2
PROCEEDINGS PAPER
Investigation of Failure Mechanisms in Ti Containing Brazing Alloys Used in SOFC/SOEC Environments Available to Purchase
Wolff-Ragnar Kiebach,
Wolff-Ragnar Kiebach
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Ruth Knibbe,
Ruth Knibbe
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Kristian B. Frederiksen,
Kristian B. Frederiksen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Ming Chen,
Ming Chen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Lars Mikkelsen,
Lars Mikkelsen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Peter V. Hendriksen
Peter V. Hendriksen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
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Wolff-Ragnar Kiebach
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Ruth Knibbe
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Kristian B. Frederiksen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Ming Chen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Lars Mikkelsen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Peter V. Hendriksen
Riso̸ National Laboratory, DTU, Roskilde, Denmark
Paper No:
FuelCell2010-33039, pp. 655-665; 11 pages
Published Online:
December 3, 2010
Citation
Kiebach, W, Knibbe, R, Frederiksen, KB, Chen, M, Mikkelsen, L, & Hendriksen, PV. "Investigation of Failure Mechanisms in Ti Containing Brazing Alloys Used in SOFC/SOEC Environments." Proceedings of the ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2. Brooklyn, New York, USA. June 14–16, 2010. pp. 655-665. ASME. https://doi.org/10.1115/FuelCell2010-33039
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