| 摘要 |
A polycrystalline diamond composite cutting insert (46) for attachment to a tool so that the cutting insert engages a work material when the tool is in operation. The cutting insert comprises a substrate (48) and an polycrystalline diamond composite layer on the substrate. The polycrystalline diamond composite layer has a transition region (50), bonded to the substrate, comprising a composite polycrystalline material in which the cemented carbide pieces, which comprise between about 40 volume percent and about 80 volume percent, and the diamond crystals are interspersed in one another. The polycrystalline diamond composite layer further includes an outer region (52), bonded to the transition region, comprising a composite polycrystalline material in which the cemented carbide pieces, which comprise between about 5 volume percent and about 45 volume percent, and the diamond crystals are interspersed in one another. |
