POLYCRYSTALLINE DIAMOND CUTTER WITH INTEGRAL CARBIDE/DIAMOND TRANSITION LAYER

摘要

A composition body (10) cutting instrument formed of a polycrystalline diamond layer (11) sintered to a carbide substrate (12) with a carbide/diamond transition layer (13). The transition layer (13) is made by creating carbide projections (16) perpendicular to the plane of the carbide substrate face in random or nonlinear orientation. The transition layer (13) manipulates residual stress caused by both thermal expansion and compressibility differences between the two materials and thus increases attachment strength between the diamond and carbide substrate by adjusting the pattern, density, height and width of the projections (16).