Rotary drill bits (full face) and casing bits with polychristalline Diamond Cutters PCD
Polychristalline diamond cutters are made of a synthetically produced mass of diamond particles based on an incidental metal matrix, which is the cause for its extremely solid character. The mass is a generation of selected diamond particles, sintered at high pressure. The sintering process is strictly observed with respect to the debit range of diamond. This results in an extremely hard and resistant structure. PCD is mainly used for drilling in soft rock eg. sand stone, lime stone, Dolomit, calk stone, shale, clay, etc. PCD is not suitable for drilling in fissured or hard rock, as they may not bear up against the high stress. The grooves of the drill bits are laterally plated or TC fitted, in order to grant additional wear protection. Flushing is normally by air or water, the rotation speed is adjusted to the soil conditions and the number of blades.