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Investigation of MoSi2/MoSi2 Joining

Hatami Ramshehm Hamid Reza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42590 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. The present work investigates joining of two MoSi2 parts through Cusil/Zr/Cusil interlayer with Cusil being a commercial eutectic of Ag-Cu alloy. The joining operation was implemented in an inert gas tube furnace by brazing. The brazing temperature ranged at 800-930°C while the operation lasted for 1hr. Interfacial microstructure was studied by Scanning Electron Microscopy (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 MoSi2 to Mo5Si3 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 Cu10Zr7 in the interlayer which confirmed the EDS results. Elements distribution of the interlayer was also analyzed using line scanning technique. Evaluation of joints strength through shear loading identified the maximum strength for the joint produced at 830°C. Investigation of cross section and morphology of fracture showed different fracture paths and types for various joint samples
  9. Keywords:
  10. Microstructure ; Mechanical Properties ; Molybdenum Di Silicide (MoSi2) ; Silver-Copper Eutectic Bond

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