| 摘要 |
<p>A polycrystalline diamond composite (PDC) cutter has a layer of polycrystalline diamond 14 attached to a cemented metal carbide substrate 12, the cutter having improved toughness or fracture resistance during use through the inclusion of boron, beryllium or the like therein in the carbide substrate 12, particularly in the zone 16 adjacent the diamond layer.</p> |
