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Superplastic Forming SPF Diffusion bonding process


In Superplastic forming, a sheet of metal is clamped between a die cavity and a plate which are kept at the convenient temperature. Gas pressure is applied to deform the sheet by forcing it against the walls of the die cavity, under suitable stress and deformation rate
This process applies to Titanium, Aluminum, some Inconel and magnesium alloys.

 

SPF and Diffusion Bonding of titanium – SPF/DB process

Initial contact : Limited to surface irregularities

Step 1 : Plastic deformation, then creep of irregular zones. In this stage, surfaces are brought unto further contact and phenomena such as oxide film rupture occur.

Step 2 : Grain growth across the interface, whereby new joints tend toward equilibrium. Remaining pores begin to disappear by diffusion at grain boundaries.

Step 3 : Elimination of last pores by diffusion through the metal volume.



Typical titanium alloys applications


  • Civil aircrafts: hot parts around engines or handling hot air : pylon panels, nacelle panels, piping components, propellers...
  • Military aircrafts: hot parts around engines : heat shields ...
  • Engines: jet engine components : air intake, fan and ogvblades,casing parts,
  • Space: miscellaneous applications
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