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Microstructure and Mechanical Properties of Reactive-Air-Brazed 3YSZ/Crofer 22 APU Joints at Ambient Temperature

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Abstract

The growth of inventive high-temperature electrochemical devices such as solid oxide fuel cells constitutes a major task in brazing technology of ceramic–metal joints. In this work, reactive air brazing was used and the joining characteristics of 3YSZ with Crofer 22 APU have been systematically analyzed for three different brazing temperatures (1000, 1050 and 1100 °C) and two dwell times (5 and 30 min). The joints have been brazed successfully using the Ag–4CuO filler alloy. This braze filler metal was manufactured by an arc PVD (physical vapor deposition) process. Further, sufficient wetting of the zirconium oxide was achieved. The morphology of the oxide reaction layer at the steel side had a major influence on the shear strength of the brazed joints. A maximum average shear strength of 101 ± 4 MPa was obtained for a temperature of 1050 °C and a dwell time of 5 min.

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Acknowledgements

The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) within the Project TI 343/147-1 (In situ investigation of the pore development during reactive air brazing of aluminum oxide ceramics).

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Authors and Affiliations

  1. RIF Institute for Research and Transfer e.V., Joseph-von-Fraunhofer-Straße 20, 44227, Dortmund, Germany

    Wolfgang Tillmann & Nadeem Babar Anar

  2. Institute of Materials Engineering, TU Dortmund University, Leonhard-Euler-Str. 2, 44227, Dortmund, Germany

    Lukas Wojarski & Joshua Jacob Lassner

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  1. Wolfgang Tillmann
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Tillmann, W., Anar, N.B., Wojarski, L. et al. Microstructure and Mechanical Properties of Reactive-Air-Brazed 3YSZ/Crofer 22 APU Joints at Ambient Temperature. Metallogr. Microstruct. Anal. 9, 529–540 (2020). https://doi.org/10.1007/s13632-020-00663-0

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