TiB2 rod, and method of fabrication and use

Abstract

A TiB 2 rod, and a method of fabrication therefore are is provided. It may be used to producing a TiB 2 coating on the tip surfaces of a resistance spot welding (RSW) electrode, such as may be of a type for welding applications in automotive, and electronic industries. There may be a rod of material for coating the tips of welding rods that includes TiB 2 ceramic having good electrical and thermal conductivities and a high melting temperature. The new TiB 2 rod may be used to produce a TiB 2 coating on an electrode tip surfaces by ESD, which may tend to be low in cost and which may tend to produce a higher electrode life as compared to an embodiment of TiC coating.

1 . A TiB 2  rod to for use in coating an RSW electrode tip surfaces using EPD, said rod including (in weight percentage): 12-24 Ni, 4-10 Mo, 0.15-1.0 W, 0.15-1.0 Co, and balance TiB 2 .  
   
   
       2 . The rod of  claim 1 , including (in weight percentage): 15-20 Ni, 4-8.5 Mo, 0.5-L1.0 W, 0.3-1.0 Co, and balance TiB 2  in  claim 1 .  
   
   
       3 . A method of fabricating the rod of  claim 1 , said method including the steps of obtaining powders of said Ni, Mo, W, Co and TiB 2 ; mixing said powders evenly; milling said powders for 24-96 hours; adding 2-10% binder; debinding 100-300° C.; and sintering under 10 MPa to 30 MPa pressure in controlled atmosphere at 1500-1900° C.  
   
   
       4 . A method of fabricating the rod of  claim 2  wherein said method includes the steps of obtaining powders of said Ni, Mo, W, Co and TiB 2 ; mixing said powders evenly; milling said powders for 48-72 hours; adding 2-10% binder; debinding 100-300° C.; and sintering under 10 MPa to 30 MPa pressure in controlled atmosphere at 1650-1800° C.