Importance

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Abstract

The invention is a composite polycrystalline diamond compact comprising at least one layer of diamond crystals and precemented carbide pieces which have been pressed under sufficient heat and pressure to create composite polycrystalline material wherein polycrystalline diamond and the precemented carbide pieces are interspersed in one another. Preferably, this composite material layer is disposed as a transition layer between the layer including the working surface of the compact and the substrate for the compact. In addition, the layer including the working surface may also be comprised of the composite material, with the general requirement that the volume percent of the polycrystalline diamond component in the layer including the working surface be higher than in the transition layer. Alternatively, the compact, rather than being divided into discrete layers, instead comprises a single layer of this composite material wherein the concentration of the polycrystalline diamond component is at its highest at the working surface of the compact and then decreases in the direction away from the working surface.

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First Claim