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ZrB2–SiC/Ti6Al4V joints: wettability studies using Ag- and Cu-based braze alloys

  • HTC 2012
  • Published:
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Abstract

In this paper, a study is presented on the wettability of ZrB2 ceramics (pure ZrB2 and ZrB2–SiC composite) and of the Ti6Al4V alloy by pure Cu and Ag and their alloys with Ti to be used in subsequent brazing processes. Wettability tests aimed at elucidating the interfacial interactions and the role of active metal additions (i.e. Ti) in the brazing procedure, performed in a temperature range between 950 and 1150 °C, showed that Cu wets pure ZrB2 quite well (contact angle θ = 70°), while Ag does not. The composite was wetted in a similar way by Cu, while for Ag a θ = 97° was found. The addition of Ti improved the wetting (θ between ~0° and 20°) and segregation at the metal–ceramic interface occurred. As expected, both Cu(Ti) and Ag(Ti) wetted the Ti6Al4V alloy very well. In particular, it was shown that Cu can already produce a liquid phase at 950 °C with partial dissolution of the solid phase. These results are discussed in terms of interfacial reactions and taking into account the sintering aids used for the ceramic body. This study is aimed at defining a brazing process that leads to reliable metal–ceramic joints as a result of chemical interactions of the liquid phase with and diffusion into the adjoining solids. Exploratory joining tests were performed that showed, by means of shear tests coupled with microstructural and microchemical description of the interfaces, the possibility to design sound ZrB2–SiC/Ti6Al4V joints.

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Acknowledgements

The ZrB2–SiC ceramics were produced by CNR-ISTEC (Faenza, Italy) which is gratefully acknowledged. The authors wish to thank Mr. Paolo Cirillo (University of Genoa, DICAT) for help in mechanical tests and Mr. Francesco Mocellin for technical support. This work is part of the Project ‘JoinHT’ funded by the ‘CARIPLO Funding Scheme, 2010’.

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Authors and Affiliations

  1. Institute for Energetics and Interphases, National Research Council, Genoa, Italy

    Fabrizio Valenza, Cristina Artini, Alberto Passerone & Maria Luigia Muolo

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  1. Fabrizio Valenza
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  2. Cristina Artini
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  3. Alberto Passerone
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  4. Maria Luigia Muolo
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Correspondence to Fabrizio Valenza.

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Valenza, F., Artini, C., Passerone, A. et al. ZrB2–SiC/Ti6Al4V joints: wettability studies using Ag- and Cu-based braze alloys. J Mater Sci 47, 8439–8449 (2012). https://doi.org/10.1007/s10853-012-6790-7

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