Method to manufacture components for gas turbines

Abstract

The invention relates to a method to manufacture components or semi-finished parts for gas turbines, in particular for aircraft engines, preferably by casting. According to the invention, a smelting crucible that is manufactured of boron nitride is Used (FIG. 1 ).

1 - 8 . (canceled)  
   
   
       9 . A method to manufacture a component or a semi-finished part for a gas turbine, in particular for an aircraft engine, preferably by casting, wherein a smelting crucible that is manufactured of boron nitride is used.  
   
   
       10 . The method according to  claim 9 , wherein the component or semi-finished part is subsequently subjected to an inspection for an undesired inclusion.  
   
   
       11 . The method according to  claim 10 , wherein the component or semi-finished part is examined for the undesired inclusion with an x-ray test.  
   
   
       12 . The method according to  claim 10 , wherein the component or semi-finished part is examined for the undesired inclusion with a neutron radiography test.  
   
   
       13 . The method according to  claim 10 , wherein after the inspection the component or semi-finished part is subjected to a further processing, for example a coating process.  
   
   
       14 . The method according to  claim 9 , wherein the component or semi-finished part is manufactured of a super alloy.  
   
   
       15 . The method according to  claim 9 , wherein the component or semi-finished part is embodied as an engine disk, which is manufactured of a super alloy, in particular of Udimet 720 LI, by casting plus forging.  
   
   
       16 . A method to manufacture a component or a semi-finished part for a gas turbine, in particular for an aircraft engine, of a super alloy by casting, wherein: 
 a) a smelting crucible that is manufactured of boron nitride is used in casting; and    b) subsequent to casting, the component or semi-finished part is subjected to an inspection for an undesired boron nitride inclusion.    
   
   
       17 . A method to manufacture a component of a gas turbine engine, comprising the step of casting the component in a smelting crucible that is made of boron nitride.  
   
   
       18 . The method according to  claim 17 , further comprising the step of inspecting the component for a boron nitride inclusion.  
   
   
       19 . The method according to  claim 18 , wherein the step of inspecting includes testing with an x-ray test.  
   
   
       20 . The method according to  claim 18 , wherein the step of inspecting includes testing with a neutron radiography test.  
   
   
       21 . The method according to  claim 18 , further comprising the step of coating the component after the steps of casting the component and inspecting the component.  
   
   
       22 . The method according to  claim 17 , wherein the component is manufactured of a super alloy.  
   
   
       23 . The method according to  claim 22 , wherein the component is an engine disk.  
   
   
       24 . The method according to  claim 22 , wherein the super alloy is Udimet 72 LI.  
   
   
       25 . The method according to  claim 17 , wherein the step of casting includes the step of forging.