Turbine blade and associated method for producing a turbine blade

Abstract

A turbine blade is provided, having a fastening section, a platform, and a blade, which follow one another along a longitudinal axis of the turbine blade, wherein the platform, in radial relation to the longitudinal axis, has an inner platform part and an outer platform part, wherein the outer platform part is designed as a closed platform frame that encloses the outer edge of the inner platform part. An associated method for producing a turbine blade is also provided.

1 .- 13 . (canceled) 
     
     
         14 . A turbine blade comprising:
 a fastening portion, with a platform for delimiting a flow duct and with a blade airfoil, which succeed one another along a longitudinal axis of the turbine blade,   wherein the platform comprises radially with respect to the longitudinal axis an inner platform part and an outer platform part, the outer platform part comprising a continuous one-piece platform frame surrounding the outer margin of the inner platform part.   
     
     
         15 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame bears in a sheet-like manner against the inner platform part, and the contact area forms at least partially with the longitudinal axis an angle which is larger than 0° and smaller than 90°.   
     
     
         16 . The turbine blade as claimed in  claim 15 ,
 wherein the angle has a size of between 10° and 35°.   
     
     
         17 . The turbine blade as claimed in  claim 14 ,
 wherein the inner platform part and the fastening portion and/or the inner platform part and the blade airfoil are monolithic.   
     
     
         18 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame has, on at least one laterally outward-pointing surface, a slot for the reception of a sealing element.   
     
     
         19 . The turbine blade as claimed in  claim 17 ,
 wherein the platform frame has, on at least one laterally outwardly-pointing surface, a slot for the reception of a sealing element.   
     
     
         20 . The turbine blade as claimed in  claim 14 ,
 wherein the platform frame is shrunk on the inner platform part and/or is soldered and/or welded to the latter.   
     
     
         21 . The turbine blade as claimed in  claim 17 ,
 wherein the platform frame is shrunk on the inner platform part and/or is soldered and/or welded to the latter.   
     
     
         22 . The turbine blade as claimed in  claim 18 ,
 wherein the platform frame is shrunk on the inner platform part and/or is soldered and/or welded to the latter.   
     
     
         23 . The turbine blade as claimed in  claim 14 , designed as a guide blade or as a moving blade. 
     
     
         24 . The turbine blade as claimed in  claim 17 , designed as a guide blade or as a moving blade. 
     
     
         25 . The turbine blade as claimed in  claim 18 , designed as a guide blade or as a moving blade. 
     
     
         26 . The turbine blade as claimed in  claim 20 , designed as a guide blade or as a moving blade. 
     
     
         27 . The turbine blade as claimed in  claim 14 ,
 wherein that surface of the inner platform part over which the hot gas can flow is substantially larger than that surface of the platform frame over which the hot gas can flow.   
     
     
         28 . The turbine blade as claimed in  claim 17 ,
 wherein that surface of the inner platform part over which the hot gas can flow is substantially larger than that surface of the platform frame over which the hot gas can flow.   
     
     
         29 . The turbine blade as claimed in  claim 18 ,
 wherein that surface of the inner platform part over which the hot gas can flow is substantially larger than that surface of the platform frame over which the hot gas can flow.   
     
     
         30 . The turbine blade as claimed in  claim 20 ,
 wherein that surface of the inner platform part over which the hot gas can flow is substantially larger than that surface of the platform frame over which the hot gas can flow.   
     
     
         31 . The turbine blade as claimed in  claim 27 , wherein that surface of the inner platform part over which the hot gas can flow is substantially larger than that surface of the platform frame over which the hot gas can flow. 
     
     
         32 . A method for producing a turbine blade, comprising:
 producing a monolithic trunk blade, comprising a blade airfoil, a platform as an inner platform part for delimiting a flow duct, and a fastening portion,   producing a continuous one-piece platform frame, and   mounting of the continuous one-piece platform frame on the margin of the platform.   
     
     
         33 . The method as claimed in  claim 32 , wherein, to produce the trunk blade, the platform margin of an operationally stressed turbine blade is set back along its entire periphery in order to produce a bearing surface for a continuous platform frame and in order to convert the platform into the inner platform part. 
     
     
         34 . The method as claimed in  claim 32 , wherein the trunk blade, comprising a fastening portion, a platform and a blade airfoil, is produced by a casting method, and the platform margin is configured as a bearing surface for a continuous platform frame. 
     
     
         35 . The method as claimed in  claim 32 , further comprising the platform frame being shrunk on the inner platform part and/or soldered and/or welded to the trunk blade. 
     
     
         36 . The method as claimed in  claim 32 , further comprising the inner platform part and the platform frame being coated in a coating operation. 
     
     
         37 . The method as claimed in  claim 35 , further comprising the inner platform part and the platform frame being coated in a coating operation.