Final-stage rotor blade of a steam turbine

Abstract

A turbine blade is provided that includes at least certain regions made of fiber reinforced composite material. Also, the turbine blade has at least one anti-erosion component for protecting against erosion. The turbine blade could be, for example, a last stage blade of a steam turbine. Furthermore, methods for producing a turbine blade of this type using an impregnation mold are provided.

1 - 13 . (canceled) 
     
     
         14 . A turbine blade, comprising:
 at least a region made from fiber-reinforced composite material, and   at least one anti-erosion component.   
     
     
         15 . The turbine blade according to  claim 14 , wherein the anti-erosion component is inserted into the blade contour of the turbine blade. 
     
     
         16 . The turbine blade according to  claim 15 , wherein the anti-erosion component is inserted into the blade contour of the turbine blade such that a smooth transition is created between the anti-erosion component and the turbine blade. 
     
     
         17 . The turbine blade according to  claim 15 , wherein the inserted anti-erosion component is connected to the turbine blade by laminating, or gluing, or by a securing device, or combinations thereof. 
     
     
         18 . The turbine blade according to  claim 17 , wherein the securing device is selected from the group consisting of: screws, rivets and pins. 
     
     
         19 . The turbine blade according  claim 14 , wherein the anti-erosion component is made from carbide, titanium or ceramic. 
     
     
         20 . The turbine blade according to  claim 14 , wherein an intermediate layer is arranged between the anti-erosion component and the turbine blade. 
     
     
         21 . The turbine blade according to  claim 20 , wherein the intermediate layer comprises an elastic and/or viscoelastic layer. 
     
     
         22 . The turbine blade according to  claim 14 , wherein the anti-erosion component has a multi-layer structure. 
     
     
         23 . The turbine blade according  claim 14 , wherein an anti-erosion component is arranged at least at the leading edge and/or the trailing edge of the turbine blade. 
     
     
         24 . The turbine blade according  claim 14 , wherein the turbine blade is a final-stage blade for a steam turbine. 
     
     
         25 . A method for making a turbine blade according to  claim 14  using an impregnation mold, the method comprising:
 laying fiber intermediates, together with the anti-erosion component, in the impregnation mold, 
 impregnating the fiber intermediates with a matrix material, 
 curing the matrix material, 
 removing the turbine blade from the impregnation mold. 
 
     
     
         26 . The method according to  claim 25 , wherein the anti-erosion component is laminated into the turbine blade during impregnation. 
     
     
         27 . The method according to  claim 26 , wherein the anti-erosion component, after it has been laminated in, is secured to the turbine blade by an additional securing device. 
     
     
         28 . The method according to  claim 25 , wherein the anti-erosion component is provided, before impregnation, with a release agent and, after impregnation, is secured to the turbine blade by gluing and/or by an additional securing device. 
     
     
         29 . The method according to  claim 25 , wherein the matrix material comprises resin. 
     
     
         30 . A method for making a turbine blade according to  claim 14  using an impregnation mold, wherein the impregnation mold is constructed such that, after impregnation, a recess which is constructed to complement the anti-erosion component is present at the points on the turbine blade at which an anti-erosion component is to be attached, the method comprising:
 laying fiber intermediates in the impregnation mold, 
 impregnating the fiber intermediates with a matrix material, 
 curing the matrix material, 
 removing the turbine blade from the impregnation mold, and 
 securing the anti-erosion component in the recesses in the turbine blade. 
 
     
     
         31 . The method according to  claim 30 , wherein the matrix material comprises resin. 
     
     
         32 . The method according to  claim 30 , wherein the securing is carried out by gluing and/or by using an additional securing means device.