Cutting element for rotary drill bit with multilayer cutting surface

A preform cutting element or 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...

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Bibliographische Detailangaben
1. Verfasser:	NEWTON, THOMAS ALEXANDER, JR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BORING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS GRINDING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS POLISHING TOOLS FOR GRINDING, BUFFING, OR SHARPENING TRANSPORTING TURNING WORKING CEMENT, CLAY, OR STONE WORKING STONE OR STONE-LIKE MATERIALS
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Beschreibung
Zusammenfassung:	A preform cutting element or 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.