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Blades and vanes

The compressor comprises of various stages of stationary vanes and rotating blades, each stage progressively increasing the air pressure prior to mixing with fuel and igniting. Blades must operate at high rotating speeds and temperatures, while vanes direct the stream propelled by the rotating blades to the next turbine stage with optimum efficiency. Both blades and vanes must be resistant to oxidation, corrosion and wear, and provide longevity in service.

Thermal processing is vital and widely used in the compressor components. HIP rejuvenation of cast vanes and blades removes internal defects thereby improving performance and extending the operational life. Vacuum brazed honeycomb seals reduce back streaming between stages, additionally vacuum brazing allows the assembly of complex vane geometries to provide inter-stage cooling. Wear resistant, thermal barrier and anti-fretting coatings are widely used to protect blades. Aero derivative engines employ single crystal turbine blades that are heat treated to achieve optimum high temperature strength and durability. Typical treated parts include:

  • Turbine blades
  • High and low pressure blades
  • Nozzle segments
  • Vane segments
  • Nozzle guide vanes
  • Stator vanes
  • Compressor cases