Golf clubhead

Abstract

Golf clubhead ( 1 ) made from metal, having a strike face ( 2 ) which has a loft angle α of greater than 45°°, said strike ( 2 ) face having has a plurality of parallel grooves ( 10 ), characterized in that the strike face ( 2 ) has a surface roughness Ra of less than 0.25 micrometre, and in that the Vickers hardness of the strike face ( 2 ) is greater than 5 GigaPascal.

1 . Golf clubhead ( 1 ) made from metal, having a strike face ( 2 ) which has a loft angle α of greater than 45°, said strike ( 2 ) face having has a plurality of parallel grooves ( 10 ), characterized in that the strike face ( 2 ) has a surface roughness Ra of less than 0.25 micrometre, and in that the Vickers hardness of the strike face ( 2 ) is greater than 5 GigaPascal.  
     
     
         2 . Golf clubhead according to  claim 1 , characterized in that the surface roughness Ra of the strike face ( 2 ) is less than 0.15 micrometre.  
     
     
         3 . Golf clubhead according to  claim 1 , characterized in that the strike face ( 2 ) is made from maraging steel.  
     
     
         4 . Golf clubhead according to  claim 1 , characterized in that the strike face ( 2 ) is made from a ceramic composition.  
     
     
         5 . Golf clubhead according to  claim 4 , characterized in that the ceramic composition is chosen from the group comprising: silicon carbide, boron carbide, titanium carbide, zirconia, alumina, and a combination of the above material.  
     
     
         6 . Golf clubhead according to  claim 1 , characterized in that the Vickers hardness of the strike face ( 2 ) is greater than 12 GigaPascal.  
     
     
         7 . Golf clubhead according to  claim 1 , characterized in that the surface roughness Ra of the strike face decreases along the height of the strike face ( 2 ).