Back to results
US 2009/0022952 A1Published application
Novel cutting structures
AssigneeSmith International, Inc.
InventorMadapusi K. Keshavan
Life of this patent
Estimating the term…
Abstract
A polycrystalline diamond compact cutter that includes a thermally stable polycrystalline diamond layer, a carbide substrate, and a polycrystalline cubic boron nitride layer interposed between the thermally stable polycrystalline diamond layer and the carbide substrate such that at least a portion of the polycrystalline cubic boron nitride layer is radially surrounded by the thermally stable polycrystalline diamond layer is disclosed.
Claims31
A polycrystaline diamond compact cutter, comprising:
- a thermally stable polycrystalline diamond layer formed from a polycrystalline diamond layer having at least a portion of binder material removed therefrom;
- a carbide substrate;
- and
- a polycrystalline cubic boron nitride layer interposed between the thermally stable polycrystalline diamond layer and the carbide substrate, wherein at least a portion of the polycrystalline cubic boron nitride layer is radially surrounded by the thermally stable polycrystalline diamond layer.
1 more element
A polycrystalline diamond compact cutter, comprising:
- a thermally stable polycrystalline diamond layer formed from a polycrystalline diamond layer having at least a portion of binder material removed therefrom;
- a carbide substrate;
- and
- at least two polycrystalline cubic boron nitride layers interposed between the thermally stable polycrystalline diamond layer and the carbide substrate, wherein at least a portion of at least one of the at least two polycrystalline cubic boron nitride layers is radially surrounded by the thermally stable polycrystalline diamond layer.
1 more element
Dependencies are inferred from the claim text.