Development and drilling performance of the brazed Ti-coated diamond drill bits

Using Ni-Cr and Cu-Sn-Ti solders to produce the brazed Ti-coated and uncoated diamond drills, the performances of four types of diamond drill bits were investigated through the drilling test of vitrified brick. The results show that the average life of Ti-coated diamond drill using Ni-Cr solder brazing decreased by 41.7% compared with the uncoated diamond drilll. The average life of Ti-coated diamond drill and uncoated diamond drill using Cu-Sn-Ti solder brazing are basically the same, but the drilling efficiency of Ti-coated diamond drill is significantly higher.Finally, the mechanism of the above conclusion is analyzed.