Process for producing a valve seat

Abstract

The invention relates to a process for producing a valve seat for a cylinder head of an internal combustion engine, in which an additional material is fused to the cylinder head, through introduction of energy, at the location at which the valve seat is to be formed, wherein the additional material used is a copper alloy which, in addition to copper, comprises the following elements: iron less than  5% by weight, manganese 10% by weight-20% by weight, cobalt  5% by weight-10% by weight, molybdenum  5% by weight, 9% by weight, 5% by weight, boron  1% by weight-3% by weight, chromium less than  3% by weight.

1 . A process for producing a valve seat for a cylinder head of an internal combustion engine, in which an additional material is fused to the cylinder head, through introduction of energy, at the location at which the valve seat is to be formed, wherein the additional material used is a copper alloy which, in addition to copper, comprises the following elements:  
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   iron less than 
                    5% by weight, 
                 
                     
                   manganese 
                   10% by weight-20% by weight, 
                 
                     
                   cobalt 
                    5% by weight-10% by weight, 
                 
                     
                   molybdenum less than 
                    5% by weight, nickel less than 9% 
                 
                     
                     
                   by weight, 
                 
                     
                   silicon less than 
                    5% by weight, 
                 
                     
                   boron 
                    1% by weight-3% by weight, 
                 
                     
                   chromium less than 
                    3% by weight, 
                 
                     
                   and inevitable impurities. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         2 . The process according to  claim 1 , wherein the additional material, as well as copper, comprises the following elements:  
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   iron 
                     2% by weight-4% by weight, 
                 
                     
                   manganese 
                   11.5% by weight-14% by weight, 
                 
                     
                   cobalt 
                     5% by weight-10% by weight, 
                 
                     
                   molybdenum 
                     2% by weight-4% by weight, 
                 
                     
                   nickel 
                     3% by weight-6% by weight, 
                 
                     
                   silicon 
                     2% by weight-4% by weight, 
                 
                     
                   boron 
                    1.5% by weight-2.5% by weight, 
                 
                     
                   chromium 
                     1% by weight-2% by weight, 
                 
                     
                   and inevitable impurities. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         3 . The process according to  claim 1 , wherein the additional material, as well as copper, comprises the following elements:  
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   iron 
                    3% by weight, 
                 
                     
                   manganese 
                   12% by weight, 
                 
                     
                   cobalt 
                    5% by weight, 
                 
                     
                   molybdenum 
                    3% by weight, 
                 
                     
                   nickel 
                    3% by weight, 
                 
                     
                   silicon 
                    2% by weight, 
                 
                     
                   boron 
                    1% by weight, 
                 
                     
                   chromium 
                    1% by weight, 
                 
                     
                   and inevitable impurities. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         4 . The process according to  claim 1 , wherein the additional material contains between 0% by weight and 15% by weight of tin.  
     
     
         5 . The process according to  claim 1 , wherein the additional material contains between 0.05% by weight and 0.3% by weight of phosphorus.  
     
     
         6 . The process according to  claim 1 , wherein the energy is introduced by means of a laser beam, and the laser beam and, the additional material pass onto the valve seat together through a coaxial nozzle.