Riblet Foil and Method for Producing Same
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[0032]FIG. 1a is a sketch-type depiction of a riblet foil. A reference mold 11 includes an area 12 and a riblet structure 13. Using a coater system 16, metallic particles 15 of a metallic powder are accelerated to a high speed in the direction toward the area 12. Due to the impact, the metallic particles 15 become deformed and combine to form a metallic material. A continuous spraying action of metallic particles 15 against the area 12 results in a layer-type buildup of a layered portion 14. When the thickness of the layered portion 14 has reached the thickness that is required for the application the spray-on action of metal powder is complete.
[0033]In this embodiment, the coater system 16 is a system for cold gas spraying. A carrier gas is compressed and accelerated by relaxation of the same inside a nozzle to a speed that is below the speed of sound of the carrier gas. The metallic powder is injected into the gas jet. The carrier gas has a temperature that is below the temperatur...
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