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Brazing of yttria-stabilized zirconia (YSZ) to stainless steel using Cu, Ag, and Ti-based brazes

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Abstract

Copper and silver-base active metal brazes containing Ti (Cu-ABA, Ticusil, and Ticuni) were tested for oxidation resistance to 750–850 °C, and for their effectiveness in joining yttria-stabilized-zirconia (YSZ) to a corrosion-resistant ferritic stainless steel. The braze oxidation behavior was characterized using thermogravimetric analysis (TGA), optical and scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). Ticusil and Ticuni at 750 °C exhibited sluggish oxidation kinetics whereas Copper-ABA at 850 °C displayed the fastest kinetics and relatively large weight gain. The SEM and EDS examination of the steel/braze and YSZ/braze interfaces showed the dissolution of Y and Zr from YSZ in braze, diffusion of Ag in the YSZ, and formation of a thin Ti-rich interphase between YSZ and Ti-base brazes. These compositional changes and interface reconstruction yielded metallurgically sound joints. The Knoop microhardness profiles showed a rather abrupt discontinuity across the YSZ/braze interfaces and a more uniform distribution across the steel/braze interface.

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Acknowledgements

The authors would like to thank Mr. John Setlock and Mark Jaster for their help at various stages of this work and Mr. Michael Halbig for critical review of the manuscript. R. Asthana acknowledges the research support received from the NASA Glenn Research Center.

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Authors and Affiliations

  1. Ohio Aerospace Institute, NASA Glenn Research Center, Cleveland, OH, 44135, USA

    Mrityunjay Singh

  2. ASRC Aerospace Corp., NASA Glenn Research Center, Cleveland, OH, 44135, USA

    Tarah P. Shpargel

  3. Engineering and Technology Department, University of Wisconsin-Stout, Menomonie, WI, 54751, USA

    Rajiv Asthana

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  1. Mrityunjay Singh
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  2. Tarah P. Shpargel
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  3. Rajiv Asthana
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Correspondence to Mrityunjay Singh.

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Singh, M., Shpargel, T.P. & Asthana, R. Brazing of yttria-stabilized zirconia (YSZ) to stainless steel using Cu, Ag, and Ti-based brazes. J Mater Sci 43, 23–32 (2008). https://doi.org/10.1007/s10853-007-1985-z

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  • DOI: https://doi.org/10.1007/s10853-007-1985-z

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