Cutting tool insert and drill bit so equipped
First Claim
1. A polycrystalline diamond abrasive element, comprising a polycrystalline diamond layer bonded to a substrate along an interface, the polycrystalline diamond layer having a working surface opposite the interface and an outer peripheral surface extending between the working surface and the interface, the polycrystalline diamond layer consisting of a region rich in catalyzing material and a region lean in catalyzing material, the region lean in catalyzing material including an annular portion adjacent to and extending along the peripheral surface away from the working surface toward but stopping short of the interface at a boundary of the region rich in catalyzing material, the annular portion being bounded between a portion of the region rich in catalyzing material and the peripheral surface.
5 Assignments
0 Petitions
Accused Products
Abstract
A polycrystalline diamond abrasive cutting element consists generally of a layer of high grade polycrystalline diamond bonded to a cemented carbide substrate. The polycrystalline diamond layer has a working surface and an outer peripheral surface and is characterized by having an annular region or a portion thereof adjacent the peripheral surface that is lean in catalyzing material. A region adjacent the working surface is also lean in catalyzing material such that in use, as a wear scar develops, both the leading edge and the trailing edge thereof are located in a region lean in catalyzing material.
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Citations
36 Claims
- 1. A polycrystalline diamond abrasive element, comprising a polycrystalline diamond layer bonded to a substrate along an interface, the polycrystalline diamond layer having a working surface opposite the interface and an outer peripheral surface extending between the working surface and the interface, the polycrystalline diamond layer consisting of a region rich in catalyzing material and a region lean in catalyzing material, the region lean in catalyzing material including an annular portion adjacent to and extending along the peripheral surface away from the working surface toward but stopping short of the interface at a boundary of the region rich in catalyzing material, the annular portion being bounded between a portion of the region rich in catalyzing material and the peripheral surface.
- 11. A polycrystalline diamond abrasive element, comprising a polycrystalline diamond layer bonded to a substrate along an interface, the polycrystalline diamond layer having a working surface opposite the interface and an outer peripheral surface extending between the working surface and the interface, the polycrystalline diamond layer consisting of a region rich in catalyzing material and a region lean in catalyzing material, the region lean in catalyzing material having a substantially annular portion adjacent the peripheral surface, commencing at a peripheral edge of the working surface and extending away from the working surface toward the interface but spaced therefrom by a portion of the region rich in catalyzing material.
- 19. A polycrystalline diamond abrasive element, comprising a polycrystalline diamond layer bonded to a substrate along an interface, the polycrystalline diamond layer having a working surface opposite the interface and an outer peripheral surface extending between the working surface and the interface, the polycrystalline diamond layer consisting of a region lean in catalyzing material adjacent at least a portion of the working surface, another, substantially annular region lean in catalyzing material adjacent the peripheral surface, contiguous with the region, extending away from the working surface toward the interface and spaced from the interface, and a region rich in catalyzing material in contact with the substrate along the interface and including a portion located between the another, substantially annular region lean in catalyzing material and the interface.
- 26. A polycrystalline diamond abrasive element, comprising a polycrystalline diamond layer bonded to a substrate along an interface, the polycrystalline diamond layer having a working surface opposite the interface and an outer peripheral surface extending between the working surface and the interface, the polycrystalline diamond abrasive layer consisting of a region rich in catalyzing material and a region lean in catalyzing material adjacent the peripheral surface having a substantially annular portion extending from adjacent the working surface toward the interface, the substantially annular portion located between a portion of the region rich in catalyzing material and the peripheral surface, another portion of the region rich in catalyzing material being located adjacent the peripheral surface and between the substantially annular region and the interface.
Specification