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Joining of MoSi 2 to itself using partial transient liquid phase (PTLP) method

Hatami, H. R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. Publisher: 2012
  3. Abstract:
  4. Molybdenum disilicide (ModSi 2) is an attractive structural material due to its unique combination of properties, namely excellent oxidation resistance, high melting point (2030°C) and relatively low density (6.3g.cm -3). The present work investigates joining of two MoSi 2 parts through Cusil/Zr/Cusil interlayer with Cusil being a commercial eutectic of Cu-Ag alloy. The joining operation was implemented in an inert gas tube furnace by brazing. The brazing temperature ranged at 830-930°C while the operation lasted for 1hr. Interfacial microstructure was studied by Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD) techniques. Applying the temperature of 830°C was led to uniform dense joint consisting of various reaction phases with excellent bonding within interfaces. Diffusion of Si to the liquid phase will transform MoSi 2 to Mo 5Si 3 which bears Ag to some extent in its structure as a solid solution. Moreover, X-ray diffraction revealed different phases such as pure Ag and Cu 10Zr 7 in the interlayer which confirms the results obtained from EDS. Diffusion of the elements was also analyzed using Line Scanning technique while strength of the joints was evaluated by Shear Loading method. Brazing process at higher temperatures does not produce appropriate strength
  5. Keywords:
  6. Brazing process ; Brazing temperature ; Cu-Ag alloys ; GaS tubes ; High melting point ; Higher temperatures ; Interfacial microstructure ; Linescanning ; Liquid Phase ; Low density ; Molybdenum disilicide ; Partial transient liquid phase ; Reaction phasis ; Shear loadings ; Bonding ; Energy dispersive spectroscopy ; Inert gases ; Joining ; Loading ; Molybdenum ; Scanning electron microscopy ; Silicon ; Silver ; X ray diffraction ; Zirconium ; Brazing
  7. Source: IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference ; 2012 , Pages 259-265 ; 9781615039753 (ISBN)
  8. URL: http://www.asminternational.org/search/-/journal_content/56/10192/CP2012IBSC259/PUBLICATION