Method for producing a hollow cast component having an inner coating

Abstract

In the method according to the invention for producing a hollow cast component having an inner coating in at least one cavity, the component is cast from a base material. A casting mold, which comprises at least one mold insert for defining at least one cavity is used for the casting. In the method according to the invention, the coating material for the inner coating of the component is applied to at least one mold insert before the component is cast. The mold insert is then removed from the cavity after the casting.

1 - 8 . (canceled)  
   
   
       9 . A method for producing a hollow cast turbine component having an inner coating in a cavity, comprising: 
 providing a cast mold comprising a mold insert defining at least one cavity to cast a component;    applying a coating material to the portion of the cast mold that defines the at least one cavity;    casting the component from a base material using the cast mold;    removing the mold insert from the cavity of the component after the casting.    
   
   
       10 . The method as claimed in  claim 9 , wherein a material that can be removed from the cavity by a chemical method and that does not attack the coating material and the base material of the component is used as the material for the mold insert.  
   
   
       11 . The method as claimed in  claim 9 , wherein a ceramic material is used as the material for the mold insert.  
   
   
       12 . The method as claimed in  claim 9 , wherein the casting temperature is lower than the melting temperature of the coating material.  
   
   
       13 . The method as claimed in  claim 9 , wherein the inner coating is an MCrAlY coating.  
   
   
       14 . The method as claimed in  claim 13 , wherein a high-energy spray method is used for applying the coating material to the mold insert.  
   
   
       15 . The method as claimed in  claim 13 , wherein the turbine component is a turbine blade or a turbine vane.  
   
   
       16 . The method as claimed in  claim 13 , wherein at least one of the portions of the cast mold defining a cavity are coated.  
   
   
       17 . A hollow cast turbine component, comprising: 
 a base material;    a cavity having an inner surface; and    an inner coating material present on the cavity inner surface.    
   
   
       18 . The hollow cast turbine component as claimed in  claim 17 , wherein the inner coating material is MCrAlY.  
   
   
       19 . The hollow cast turbine component as claimed in  claim 17 , wherein the component is cast from the base material using a cast mold comprising a mold insert for defining the cavity.  
   
   
       20 . The hollow cast turbine component as claimed in  claim 17 , wherein a material that can be removed from the cavity by a chemical method and that does not attack the coating material and the base material of the component is used as the material for the mold insert.  
   
   
       21 . The hollow cast turbine component as claimed in  claim 17 , wherein a ceramic material is used as the material for the mold insert.  
   
   
       22 . The hollow cast turbine component as claimed in  claim 17 , wherein the casting temperature is lower than the melting temperature of the coating material.