| 摘要 |
A PCD structure comprises a first region (24) and a second region (25) adjacent the first region, the second region being bonded to the first region by intergrowth of diamond grains; the first region comprising a plurality of alternating strata or layers (24c, 24t), each stratum or layer having a thickness in the range of around 5 to 300 microns. The second region (25) comprises a plurality of strata or layers, one or more strata or layers in the second region having a thickness greater than the thicknesses of the individual strata or layers in the first region (24). The alternating layers or strata in the first region comprise first layers or strata alternating with second layers or strata, the first layers or strata being in a state of residual compressive stress and the second layers or strata being in a state of residual tensile stress. |
