Method for coating a component and coated component

Abstract

A surface to be coated of a component is roughened by a laser. The roughened surface is coated by cold spraying. A component may be produced according to the method, which is coated with a layer.

1 . A method for coating a surface of a component comprising steps of:
 roughening the surface of the component by a laser in a crater-shaped manner and coating the roughened surface of the component by a thermal spraying process with high kinetic energy.   
     
     
         2 . The method of  claim 1 , wherein the surface to be coated is ground and/or polished before roughening. 
     
     
         3 . The method of  claim 1 , wherein the surface to be coated of the component is repeatedly exposed by laser in pulses at predetermined locations in such a way that crater-shaped depressions are formed at the predetermined locations. 
     
     
         4 . The method of  claim 3 , wherein time intervals are provided between the pulses in such a way that material melted by light of the laser can first solidify again before the predetermined location is again exposed by the light of the laser. 
     
     
         5 . The method of  claim 3 , wherein each predetermined location is exposed at least 3 times and not more than 25 times by light of the laser. 
     
     
         6 . The method of  claim 3 , wherein, by laser roughening, crater-shaped depressions with a depth of at least 10 μm and not more than 60 μm are produced. 
     
     
         7 . The method of  claim 6 , wherein, by laser roughening, crater-shaped depressions are produced in which the diameter of each crater-shaped depression at the upper edge thereof corresponds to about the depth of the crater-shaped depression. 
     
     
         8 . The method of  claim 7 , wherein the crater-shaped depressions have a diameter of 30 μm to 50 μm at the upper edge and a depth of 30 μm to 50 μm. 
     
     
         9 . The method of  claim 1 , wherein the component is located in a gas atmosphere of noble gas, including one of argon and nitrogen, during at least one of the roughening and the coating. 
     
     
         10 . The method of  claim 1 , wherein the roughened surface is coated by cold spraying or HVAF. 
     
     
         11 . The method of  claim 1 , wherein the coated surface includes crater-shaped depressions having circular diameters and having a depth of at least 20 μm and not more than 60 μm. 
     
     
         12 . The method of  claim 11 , wherein an upper edge of each crater-shaped depression protrudes in a bead-like manner with respect to adjacent polished areas of the coated surface. 
     
     
         13 . The method of  claim 12 , wherein upper edge of each crater-shaped depression protrudes in a bead-like manner with respect to adjacent polished areas of the coated surface by at least 10 μm. 
     
     
         14 . The method of  claim 1 , wherein the coated surface includes crater-shaped depressions having circular diameters and having a depth of not more than 60 μm. 
     
     
         15 . The method of  claim 3 , wherein each predetermined location is exposed not more than 25 times by light of the laser. 
     
     
         16 . The method of  claim 3 , wherein, by laser roughening, crater-shaped depressions with a depth of not more than 60 μm are produced. 
     
     
         17 . The method of  claim 1 , wherein the step of roughening the surface of the component includes impinging the surface with a laser beam of the laser as a right angle to the surface. 
     
     
         18 . The method of  claim 9 , wherein the gas is heated to a temperature within a range of about 500 degrees Celsius to about 1200 degrees Celsius. 
     
     
         19 . The method of  claim 3 , wherein the predetermined locations form a repeating pattern on the surface of the component. 
     
     
         20 . The method of  claim 1 , wherein the coated surface includes crater-shaped depressions having circular diameters and having a depth of not more than 20 percent of the circular diameter.