Brazing treatments in high vacuum furnaces

Vacuum brazing is a process for joining metal materials in which a filler material is used having a melting temperature higher than 450 ° C, but lower than the melting temperature of the base materials.

The filler material, applied in the small space between the two pieces of base metal (joint), is brought to fusion through a high temperature thermal cycle performed with a high vacuum furnace (p <10-4 mbar).

Once melted, the filler material flows by capillarity into the joint. The subsequent cooling in the oven causes the solidification of the brazing material and therefore the union between the two parts.

Advantages

  • High resistance of the brazed joint which guarantees tightness at high operating pressures
  • Possibility of combining different metal materials and different thicknesses and therefore a high degree of freedom for designers
  • Absence of contamination / oxidation of materials since the thermal cycle is performed in high vacuum
  • Possibility of brazing and hardening of the material in a single thermal cycle
  • Possibility of brazing large quantities in a single charge
  • Possibility of brazing different joints of a product in a single charge
  • High dimensional accuracy of parts

Applications

Aerospace

  • Engine components

Energy (gas turbines)

  • Combustion chambers (Liners)
  • Nozzles
  • Injectors
  • Burners
  • Seals (honeycomb) of stator rings

Materials

  • Stainless steels (austenitic and martensitic)
  • Precipitation steels (PH)
  • Nickel / Cobalt based super alloys
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