Guide blade segment of a gas turbine and method for its production

Abstract

A guide blade segment of a gas turbine, having at least one guide blade and having an inner cover band assigned to the radially inner end of the or each guide blade, is disclosed. An integral constituent part of the inner cover band of the guide blade segment is a sealing element, which serves to seal a radially inner gap between the guide blade segment and a gas turbine rotor.

1 - 13 . (canceled) 
   
   
       14 . A guide blade segment of a gas turbine, comprising a guide blade and having an inner cover band assigned to a radially inner end of the guide blade, wherein an integral constituent part of the inner cover band of the guide blade segment is a sealing element, which seals a radially inner gap between the guide blade segment and a gas turbine rotor. 
   
   
       15 . The guide blade segment according to  claim 14 , wherein the sealing element is integrally cast on the inner cover band. 
   
   
       16 . The guide blade segment according to  claim 14 , wherein the sealing element is integrally formed on the inner cover band using injection molding. 
   
   
       17 . The guide blade segment according to  claim 14 , wherein the sealing element is a honeycomb seal. 
   
   
       18 . A method for producing a guide blade segment of a gas turbine, wherein the guide blade segment has a guide blade and an inner cover band assigned to a radially inner end of the guide blade, wherein a sealing element, which seals a radially inner gap between the guide blade segment and a gas turbine rotor, is formed on the inner cover band of the guide blade segment as an integral constituent part of the inner cover band. 
   
   
       19 . The method according to  claim 18 , wherein the sealing element is integrally cast on the inner cover band. 
   
   
       20 . The method according to  claim 18 , wherein the sealing element is integrally formed on the inner cover band using injection molding. 
   
   
       21 . The method according to  claim 20 , wherein a common molded article or a green compact is produced during the injection molding for the sealing element and the inner cover band. 
   
   
       22 . The method according to  claim 20 , wherein separate molded articles or green compacts are produced during the injection molding for the sealing element and the inner cover band, which as brown compacts are formed on one another and jointly sintered. 
   
   
       23 . The method according to  claim 20 , wherein the injection molding is carried out as two-component injection molding. 
   
   
       24 . The method according to  claim 20 , wherein a homogeneous mass made of a powder, a binding agent, and a plasticizing agent is used during the injection molding and wherein a hard metal powder and/or a powder of an intermetallic phase and/or a powder of metal alloys and/or a ceramic powder is used as the powder. 
   
   
       25 . The method according to  claim 18 , wherein the sealing element and the inner cover band are integrally formed by a generative manufacturing method. 
   
   
       26 . The method according to  claim 25 , wherein the generative manufacturing method is a rapid prototyping method. 
   
   
       27 . The method according to  claim 25 , wherein the generative manufacturing method is laser engineered net shaping, electron-beam melting, laser sintering, laser melting, laser shaping, or laser powder application welding. 
   
   
       28 . A method for producing a guide blade segment of a gas turbine, wherein the guide blade segment has a guide blade and an inner cover band on a radially inner end of the guide blade, comprising the step of:
 integrally forming a sealing element on the inner cover band of the guide blade segment.   
   
   
       29 . The method according to  claim 28 , wherein the step of integrally forming the sealing element on the inner cover band of the guide blade segment includes integrally casting the sealing element on the inner cover band. 
   
   
       30 . The method according to  claim 28 , wherein the step of integrally forming the sealing element on the inner cover band of the guide blade segment includes injection molding. 
   
   
       31 . The method according to  claim 28 , wherein the step of integrally forming the sealing element on the inner cover band of the guide blade segment includes a generative manufacturing method. 
   
   
       32 . The method according to  claim 31 , wherein the generative manufacturing method is a rapid prototyping method. 
   
   
       33 . The method according to  claim 31 , wherein the generative manufacturing method is laser engineered net shaping, electron-beam melting, laser sintering, laser melting, laser shaping, or laser powder application welding.