Polycrystalline Diamond Compact for Drilling

Description

PDC is composed of a layer of polycrystalline diamond and hard alloy substrate, and is synthesized through agglomeration of diamond micropowder and hard alloy substrate under the condition of ultrahigh pressure and high temperature (*0, **0 atmospheric pressure, ********0℃). 　　PDC is mainly applicable for PDC drilling bit for drilling into soft and intermediate-hardness stratum. 　　Microstructure with complete C-C bond combination is characterized between the grains of diamond in polycrystalline diamond layer, which allows the high strength, high hardness and high wearing property of diamond layer as well as good self-sharpening property. New cutting surfaces will appear during the course of abrasion, which keeps effective cutting rocks. 　　PDC drilling bit made of such PDC will break up rocks depending on shearing action when it works, which is more effective than crushing of rocks by roller cone bit or plowing and grinding of rocks by diamond impregnated bit. 　　The serrate structure combination between polycrystalline diamond layer and hard alloy substrate allows more fixed combination between the two layers and allows more impact resistance of the whole PDC. There are mainly two sort of serrate forms of M serial and U serial for selection by clients, and special tailoring is also available according to clients’ requirement.