Vespel® SCP-5050 Saves Weight and Extends Shroud Life

composite shroud
Composite Shroud

Jet engine shrouds made with high-temperature resistant Vespel® SCP-5050 composite material offer proven impact resistance and potentially significant weight savings (40% less versus aluminum; 75% less versus stainless steel and titanium). Shrouds made with Vespel® SCP-5050 also provide longer component life thanks to reduced wear interfaces, utilization of bearing material for the entire shroud, and elimination of bushing life issues.

Composite shrouds provide a low-friction, wear-resistant surface that prevents damage to expensive metal vane stems. Further, Vespel® SCP-5050 can simplify design and assembly, and the weight savings realized by using this material can help improve aircraft fuel efficiency, range and payload capacity. 

Application

  • A shroud is a segmented ring with holes drilled radially outward for variable vane stems used inside a jet engine compressor. Some are split.
  • Grooves are cut into shroud to accept metal connecting ring, frequently with an abradable seal.
  • Shrouds are typically aluminum, stainless steel, or titanium.
  • Shrouds utilize bushings to enhance wear and reduce friction for variable vane stems.
  • Inner shrouds typically float on the engine axis.

Challenges

  • Damage can occur to expensive metal components such as vanes if bushings wear out prematurely.
  • Components need to withstand thermal excursions for duration of expected engine life.
  • Shrouds need to withstand impact, loading, and maintain relative location of vanes.
  • Shrouds need to be designed to allow simultaneous assembly with multiple vanes.
More Hot Wear Resistance
 

Solution

Design shrouds in light weight, high temperature, wear resistant Vespel® SCP-5050 composite material instead of metal.

Features and Benefits

  • High temperature material capabilities in application environments in excess of 600 °F/315 °C.*
  • Longer component life due to reduced wear interfaces, utilization of bearing material for entire shroud, and elimination of bushing life issues.
  • Proven impact resistance.
  • Potential weight savings of 40% over aluminum and 75% over stainless steel and titanium due to lower density of composite materials.
  • Fewer parts to stock and assemble through bushing elimination.
  • Lower system cost through part consolidation.
  • Provide largest subassembly possible.
  • Lower friction vs. metal with dynamic coefficient of .2 or less.
  • Vibration dampening properties of composites versus metals.
Stiff when Hot

Product Information

*Actual temperature limits are dependent on specific application conditions. For more information, please contact your DuPont representative.