| 摘要 |
A cutting structure, for a rotary drill bit, is of the kind comprising a preform cutting element having a front cutting face formed of superhard material, such as polycrystalline diamond, and a rear face bonded to s carrier of less hard material, such as cemented tungsten carbide. The cutting element is bonded to the carrier by means of an alloy having the following composition: Ni 30 60 Pd 30 - 62 Si 3 - 15% An alternative alloy has the following compsoition: Cr 4 - 10% Fe 1 - 5% Si 2 - 7% C 0.01 - 0.10% B 2 - 5% Ni Balance |
