Preparing diamond bit with Cu-Mn damping alloy in matrix and drilling test

Harmful vibration often occurs in the drilling process of impregnated diamond bit, which greatly affects the stability of drilling. Copper-manganese damping alloy can dissipate vibration energy and achieve the purpose of damping vibration. Therefore, copper-manganese powder is used to replace 663 bronze powder in 63^# formula to make matrix sample and hence diamond bit. The results of mechanical properties test and fracture morphology analysis show that compared with 63^# formula sample, the matrix sample with 40wt% copper-manganese powder has uniform microstructure, compact structure and 14.7% hardness increase. The wear ratio of impregnated diamond bit increases by 13.2%, and the bending strength decreases by 22.4%. The drilling test results show that the drilling performance of Cu-Mn formula drill bit with 40wt% Cu-Mn is similar to that of 63^# diamond drill bit, while the drilling vibration acceleration amplitude is reduced by 4.3%. Therefore, drilling damping performance is improved, and the drilling process is more stable.