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Journal of Materials Science

, Volume 48, Issue 14, pp 5029–5035 | Cite as

Isothermal solid–liquid transitions in the (Ni,B)/ZrB2 system as revealed by sessile drop experiments

  • C. ArtiniEmail author
  • M. L. Muolo
  • A. Passerone
  • G. Cacciamani
  • F. Valenza
Article

Abstract

In the framework of joining processes of ultrahigh temperature ceramics (UHTCs), sessile drop experiments were performed in the Ni–B/ZrB2 system in the range 1110° ≤ T ≤ 1200 °C. They show that, at temperatures between 1110 and 1150 °C, isothermal solid–liquid transitions occur in a sequence; while in fact at T ≥ 1200 °C, the drop melts without any further phase transition, at lower temperatures, complete melting is followed by a solidification stage and final remelting. This complex behavior, which can be very relevant when utilizing Ni–B alloys for brazing processes (e.g., by the transient liquid phase bonding technique), is successfully interpreted on the basis of the complete B–Ni–Zr phase diagram newly computed by CALPHAD: Isothermal sections, calculated between 1110 and 1150 °C, show that the composition of the drop enters, crosses, and leaves the primary solidification region of the Zr2Ni21B6 ternary compound. The use of thermodynamic modeling for the explanation of experimental data sets a link between wetting and joining experiments and phase diagrams assessment.

Keywords

Contact Angle Isothermal Section Ternary Compound Drop Height Liquid Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Dr. P. Manfrinetti (DCCI, the University of Genoa) and Mr. A. Risplendente (Department of Earth Sciences, the University of Milan) are acknowledged for their help in preparing alloys and performing WDS analyses. The authors wish to thank Mr. Francesco Mocellin (CNR-IENI) for his technical support. This work was part of the Project “JoinHT” funded by the “CARIPLO Funding Scheme—2010.”

Supplementary material

Supplementary material 1 (MPG 2222 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • C. Artini
    • 1
    Email author
  • M. L. Muolo
    • 1
  • A. Passerone
    • 1
  • G. Cacciamani
    • 2
  • F. Valenza
    • 1
  1. 1.National Research Council-Institute for Energetics and Interphases (CNR-IENI)GenoaItaly
  2. 2.Department of Chemistry and Industrial Chemistry (DCCI)University of GenovaGenoaItaly

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