Method of rational large volume CVD production

Abstract

The present invention relates to a method to rationally coat cutting tool inserts comprising a substrate and a coating deposited using a CVD and/or MTCVD method. According to the invention the inserts are positioned on a net with a surface roughness, R a , of the wires between 2 and 50 μm.

1 . In a method to rationally coat cutting tool inserts comprising depositing a coating on a substrate using a CVD and/or MTCVD method, the improvement comprising positioning the inserts on a wire net with a surface roughness, R a , of the wires of between 2 and 50 μm.  
   
   
       2 . In the method of  claim 1  wherein the surface roughness, R a , of the wires is between 3 and 20 μm.  
   
   
       3 . In the method of  claim 2  wherein the net has been coated with a spray-coating with an average thickness between 5 and 300 μm on the side to be in contact with the inserts.  
   
   
       4 . In the method of  claim 3  wherein the spray-coated net has been pre-coated with a CVD and/or MTCVD coating based on TiC/Ti(C,N)/TiN/Al 2 O 3  of a total thickness between 2 and 50 μm.  
   
   
       5 . In the method of  claim 4  wherein the net material is made of Fe, Ni, Mo, Cr, Ta, Ti, W or alloys based thereof.  
   
   
       6 . In the method according to  claim 5  wherein the net material is Fe, Mo or alloys based thereof.  
   
   
       7 . In the method of  claim 4  wherein the spray-coating material is Fe, Ni, Mo, Cr, Ta, Ti, W or alloys based thereof.  
   
   
       8 . In the method of  claim 7  wherein the spray-coating material is Fe, Mo or alloys based thereof.  
   
   
       9 . In the method of  claim 2  wherein the surface roughness is obtained by etching and/or mechanical treatment.  
   
   
       10 . A woven metal net wherein the surface roughness, R a , of the wires is between 2 and 50 μm.  
   
   
       11 . A woven metal net of  claim 10  wherein the wires are made of Fe, Ni, Mo, Cr, Ta, Ti, W or alloys based thereof.  
   
   
       12 . A woven metal net of  claim 11  wherein the wires are made of Fe, Mo or alloys based thereof.  
   
   
       13 . A woven metal net of  claim 10  wherein the surface roughness of the wires is between 3 and 20 μm.  
   
   
       14 . A woven metal net of  claim 10  wherein the wires are coated with a CVD and/or MTCVD coating based on TiC/Ti(C,N)/TiN/Al 2 O 3  of a total thickness between 2 and 50 μm.