Microstructure, Mechanical Properties and Stability of Brazed Metal/Ceramic Systems

Technological Aspects and Testing Methodologies
  • O. C. Paiva
  • L. Ferreira
  • M. A. Barbosa
Chapter
Part of the NATO ASI Series book series (ASHT, volume 58)

Abstract

In this study titanium to alumina and 316 stainless steel to silicon nitride brazed joints were produced by using active filler metals in the Ag-Cu-Ti system. The main aims of the work were to show the need for the implementation of metal/ceramic (M/C) joints degradation studies and to try to relate those results with the respective microstructures and attained bond strength. The degradation behaviour of the M/C joints was assessed by means of electrochemical techniques, namely the measurement of the corrosion potential as a function of time and potentiodynamic polarisation experiments. For a particular system (aimed at being used in automobile parts) the degradation behaviour was assessed by immersing the joints in a lubricant at 60°C. After immersion aliquots of the solutions were analysed by FTIR and the joints were mechanically tested (shear stress up to fracture). The fracture surfaces were then studied using SEM/EDS and XRD.

Keywords

Bond Strength Silicon Nitride Filler Metal Reaction Layer Degradation Behaviour 
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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • O. C. Paiva
    • 1
    • 2
  • L. Ferreira
    • 3
  • M. A. Barbosa
    • 1
    • 3
  1. 1.Instituto de Engenharia BiomédicaINEBPortoPortugal
  2. 2.Instituto Superior de Engenharia do Porto, Rua de S. ToméISEPPortoPortugal
  3. 3.Faculdade de Engenharia da Universidade do Porto Rua dos BragasFEUPPorto CodexPortugal

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