Thermoplastic last-stage blade

Abstract

A turbine blade, a turbine and a method of manufacturing a damping zone of a turbine blade are provided. The turbine blade includes a damping zone with a damping layer and the damping layer has a fiber matrix system. The fiber matrix system has a thermoplastic matrix. Reinforcing fibers are embedded in the thermoplastic matrix.

1 .- 15 . (canceled) 
     
     
         16 . A turbine blade, comprising:
 a damping zone including a damping layer with a fiber matrix system,   wherein the fiber matrix system has a thermoplastic matrix comprising reinforcing fibers.   
     
     
         17 . The turbine blade as claimed in  claim 16 , wherein the reinforcing fibers are embedded in the thermoplastic matrix. 
     
     
         18 . The turbine blade as claimed in  claim 16 , wherein the damping zone includes fiber layers, the fiber layers together with the damping layer forming a laminar structure. 
     
     
         19 . The turbine blade as claimed in  claim 16 , further comprising:
 a blade region,   wherein the blade region comprises a plurality of further fiber layers, and   wherein the plurality of further fiber layers embodies a further laminar structure.   
     
     
         20 . The turbine blade as claimed in  claim 16 , wherein the reinforcing fibers are embedded in the thermoplastic matrix at an angle between 1 degree and 90 degrees to one another. 
     
     
         21 . The turbine blade as claimed in  claim 16 , wherein the reinforcing fibers are embedded in the thermoplastic matrix parallel to one another. 
     
     
         22 . The turbine blade as claimed in  claim 16 , wherein at least one of the reinforcing fibers includes a hybrid yarn, and wherein the hybrid yarn comprises a thermoplastic material and a carbon fiber material. 
     
     
         23 . The turbine blade as claimed in  claim 18 , wherein the damping layer has a lower elastic rigidity or a higher damping value than the fiber layers. 
     
     
         24 . The turbine blade as claimed in  claim 18 , wherein the damping layer has a lower elastic rigidity and a higher damping value than the fiber layers. 
     
     
         25 . The turbine blade as claimed in  claim 19 , wherein the damping zone has a lower elastic rigidity or a higher damping value than the blade region. 
     
     
         26 . The turbine blade as claimed in  claim 19 , wherein the damping zone has a lower elastic rigidity and a higher damping value than the blade region. 
     
     
         27 . The turbine blade as claimed in  claim 16 , further comprising:
 an enveloping layer,   wherein the enveloping layer is wrapped around a surface of the turbine blade such that the turbine blade is protected against external influences, and   wherein the enveloping layer comprises non-reinforced thermoplastic material.   
     
     
         28 . The turbine blade as claimed in  claim 16 , further comprising:
 a further fiber matrix system with a thermoplastic matrix,   wherein the further fiber matrix system is disposed in the damping zone or the blade region such that the further fiber matrix system is exposed to external influences of the turbine blades, and   wherein the further fiber matrix system comprises reinforcing fibers which are present as fiber mats with arbitrary main fiber directions.   
     
     
         29 . The turbine blade as claimed in  claim 16 , further comprising:
 a further fiber matrix system with a thermoplastic matrix,   wherein the further fiber matrix system is disposed in the damping zone and the blade region such that the further fiber matrix system is exposed to external influences of the turbine blades, and   wherein the further fiber matrix system comprises reinforcing fibers which are present as fiber mats with arbitrary main fiber directions.   
     
     
         30 . A turbine, comprising:
 a turbine blade, comprising:
 a damping zone including a damping layer with a fiber matrix system, 
 wherein the fiber matrix system has a thermoplastic matrix comprising reinforcing fibers. 
   
     
     
         31 . The turbine as claimed in  claim 30 , wherein the turbine is a steam turbine and the turbine blade is a rotor blade of the steam turbine. 
     
     
         32 . A method of manufacturing a damping zone of a turbine blade, comprising:
 embedding reinforcing fibers into a thermoplastic matrix in order to form a fiber matrix system of a damping layer;   forming the damping zone of the turbine blade by the damping layer.   
     
     
         33 . The method as claimed in  claim 32 , wherein, during the embedding, the thermoplastic matrix is melted and the reinforcing fibers are pressed onto the thermoplastic matrix. 
     
     
         34 . The method as claimed in  claim 32 , further comprising
 deforming the damping zone in order to match the damping zone to a predefined shape of the turbine blade by a further melting of the thermoplastic matrix.