Riblet Foil and Method for Producing Same

Abstract

A method for producing a layer-type buildup of riblet foil involves applying a metal powder is to a reference mold, which has a female mold of a riblet structure, in such a manner that a metallic material is formed. The layered portion applied in this manner is then detached, thereby forming a riblet foil having a riblet structure.

1 - 9 . (canceled) 
     
     
         10 . A method for producing a metallic riblet foil by a layer-type buildup by implementing the following steps at least once, the method comprising the steps of:
 providing a reference mold having a structure at least on one area corresponding to a female mold of at least one riblet structure;   applying at least one layered portion made of a metal powder onto at least one area of the reference mold in such a manner that the at least one layered portion combines into a metal material; and   detaching the at least one layered portion from the reference mold, which forms the metal riblet foil having a riblet structure at least on one area thereof.   
     
     
         11 . The method of  claim 10 , wherein the application of the at least one layered portion is achieved by spraying on a metal powder. 
     
     
         12 . The method of  claim 10 , wherein the at least one layered portion comprises a first layered portion of a metal powder comprising titanium or alloys of titanium, and a second layered portion of a metal powder comprising aluminum or alloys of aluminum. 
     
     
         13 . The method of  claim 10 , wherein a thickness of the at least one layered portion is variable. 
     
     
         14 . The method of  claim 10 , wherein the reference mold is reusable. 
     
     
         15 . The method of  claim 10 , wherein the reference mold is configured as a roller. 
     
     
         16 . The method of  claim 15 , wherein the at least one layered portion is adjustable by controlling a rotational speed of the roller. 
     
     
         17 . The method of  claim 10 , wherein a surface of the metallic riblet foil is at least partially refined.