Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1990-08-03
1992-08-04
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175379, 175426, 407119, E21B 1046
Patent
active
051350610
ABSTRACT:
A preform cutting element for a rotary drill bit for use in drilling or coring holes in subsurface formations includes a cutting table 12, 13 of superhard material such as polycrystalline diamond. The rear face of the cutting table is bonded to a substrate 11 of less hard material, such as cemented tungsten carbide. A front portion 12 of the cutting table comprises a form of superhard material which is less wear-resistant than the superhard material forming the remainder 13 of the cutting table. The provision of the less wear-resistant superhard material at the front cutting faces reduces the tendency of the cutting table to spall.
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