Chapter 46. Development of a High-Temperature Ceramic Braze: Analysis of Phase Equilibria in the Pd-Ag-CuOx System

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. K. Scott Weil1 and
  2. Jens T. Darsell2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch46

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Weil, K. S. and Darsell, J. T. (2006) Development of a High-Temperature Ceramic Braze: Analysis of Phase Equilibria in the Pd-Ag-CuOx System, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch46

Author Information

  1. 1

    Pacific Northwest National Laboratory P.O. Box 999, Richland, WA 99352

  2. 2

    Washington State University PO Box 642920, Pullman, WA 99164–2920

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • pseudobinary;
  • monotectic;
  • palladium;
  • eutectic;
  • equilibrium

Summary

This paper describes the effects of small palladium additions on the phase equilibria in the Ag–CuOx system. Below a concentration of 5 mol%, palladium was found to increase the temperature of the eutectic reaction present in the pseudobinary system, but have little effect on a higher temperature monotectic reaction. However once enough palladium was added to increase the pseudoternary solidus temperature to that of the lower boundary for this three–phase field (∼970°C), the lower boundary begins to increase in temperature as well. The addition of palladium also causes the original eutectic point to move to lower silver concentrations, which also causes a convergence of the two new three–phase fields, CuOx + L1 + L2 and CuOx + α + L1This suggests that with higher palladium concentrations, a peritectic reaction, αa + L1 + L2 CuOx, may eventually be observed in the system.