Focusing nozzle

Abstract

A focusing nozzle for abrasive water jet cutting has a nozzle body of carbide metal formed with a bore. At least the bore wall is formed with a single-layer or multi-layer coating of hard material. The hard material coating has a coat with titanium nitride content at least at the free surface.

1 . A focusing nozzle for abrasive water jet cutting, comprising: 
 a nozzle body of hard metal;    said nozzle body having a bore formed therein with a bore wall for focusing an abrasive water cutting jet; and    a coating of hard material on said bore wall, said coating having a layer with a titanium nitride content at least at a free surface thereof.    
   
   
       2 . The focusing nozzle according to  claim 1 , wherein said coating is a single-layer coating.  
   
   
       3 . The focusing nozzle according to  claim 1 , wherein said coating is a multi-layer coating.  
   
   
       4 . The focusing nozzle according to  claim 1 , wherein said hard material coating is a single titanium nitride layer or a single titanium carbonitride layer.  
   
   
       5 . The focusing nozzle according to  claim 1 , wherein said hard material coating has a layer thickness in a range from 1 to 15 μm.  
   
   
       6 . The focusing nozzle according to  claim 5 , wherein said coating is a CVD process coating.  
   
   
       7 . The The focusing nozzle according to  claim 1 , wherein said hard metal of said nozzle body comprises up to 1.5 wt. % cobalt as a metallic binder, up to 3 wt. % mixed carbides, and a remainder tungsten carbide with a grain size of less than 0.4 μm.