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  1. Interface Reactions Responsible for Run-out in Active Brazing: Part 1

    The run-out phenomenon was observed in Ag-Cu-Zr active braze joints made between the alumina ceramic and Kovar™ base material. Run-out introduces a significant yield loss by generating functional and/or cosmetic defects in brazements. A prior study identified a correlation between run-out and the aluminum (Al) released by the reduction/oxidation and the latter’s reaction with the Kovar™ base material. A study was undertaken to understand the fundamental principles of run-out by examining the interface reaction between Ag-xAl filler metals (x=2, 5, and 10 wt.%) and KovarÔ base material. Sessile drop samples were fabricated using brazing temperatures of 965°C or 995°C andmore » times of 5 min or 20 min. The correlation was made between the degree of wetting-and-spreading by the sessile drops and the run-out phenomenon. Wetting-and-spreading increased with Al content (x) of the Ag-xAl filler metal, but was largely insensitive to the brazing process parameters. The increased Al concentration resulted in higher Al contents of the (Fe, Ni, Co) xAl y reaction layer. Run-out was predicted when the filler metal has a locally-elevated, Al content exceeding 2 – 5 wt.%. Lastly, several mitigation strategies were proposed, based upon these findings.« less
  2. Diffusion Bonding of Cu to Nb.

    Abstract not provided.
  3. Diffusion bonding of Cu to Nb.

    Abstract not provided.
  4. Controlling braze joint gap uniformity for exceptional tensile strengths.

    Abstract not provided.
  5. Understanding the Run-out Behavior of a Ag-Cu-Zr Braze Alloy When Used to Join Alumina to an Fe-Ni-Co Alloy.

    Abstract not provided.
  6. Understanding the Run-out Behavior of a Ag-Cu-Zr Braze Alloy When Used to Join Alumina to an Fe-Ni-Co Alloy.

    Abstract not provided.
  7. Diffusion bonding of Cu to Nb.

    Abstract not provided.
  8. Diffusion Bonding of Cu to Nb.

    Abstract not provided.
  9. Run-out Phenomenon in Ag-Cu-Zr Active Braze Joints Made Between Alumina and an Fe-Ni-Co Alloy.

    Abstract not provided.
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"Walker, Charles A."

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