Cutting elements with binderless carbide layer

Details Cutting elements with binderless carbide layer Cutting elements with binderless carbide layer

1998-07-20

2000-05-23

Schoeppel, Roger

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175431, 419 48, 228 31, E21B 1000

Patent

active

060655526

ABSTRACT:
An earth-boring bit has cutting elements inserted within holes in the cutter support. The cutting element has a body of a fracture-tough material, preferably tungsten carbide which contains a binder of a soft metal. A layer of a composite carbide which is substantially free of a binder is attached to the cutting end of the body. One cutting element has a chisel-shaped cutting end with two flanks that converge. One of the flanks has the layer of binderless carbide. This insert is located at a junction between the gage surface and heel surface for engaging the sidewall of the bore. Also, gage inserts located in the gage surface have outer ends containing a layer of binderless carbide.

REFERENCES:
patent: 4341557 (1982-07-01), Lizenby
patent: 4359335 (1982-11-01), Garner
patent: 4428906 (1984-01-01), Rozmus
patent: 4656002 (1987-04-01), Lizenby et al.
patent: 4722405 (1988-02-01), Langford, Jr.
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patent: 5482670 (1996-01-01), Hong
patent: 5542485 (1996-08-01), Pessier et al.
AH "Roctec Composite Carbides" Dow Chemical Company brochure; Date unknown.

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