Layered polycrystalline diamond
AssigneeSchlumberger Technology Corporation
InventorDavid R. Hall
Life of this patent
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Abstract
In one aspect of the present invention, a high impact wear resistant tool has a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The superhard material has a thickness of at least 0.100 inch and forms an included angle of 35 to 55 degrees. The superhard material has a plurality of substantially distinct diamond layers. Each layer of the plurality of layers has a different catalyzing material concentration. A diamond layer adjacent the substrate of the superhard material has a higher catalyzing material concentration than a diamond layer at a distal end of the superhard material.
Claims22
A tip for use in a high impact, wear resistant tool, the tip comprising:
- a substrate having a base end and a non-planar interface spaced apart from said base end;
- and
- a superhard material bonded to said non-planar interface and having a distal end with an apex spaced apart from said non-planar interface, said superhard material having a thickness of at least 0.100 inches, and said superhard material having a plurality of diamond layers including:
- a first diamond layer adjacent to said non-planer interface, said first diamond layer having a first catalyzing material concentration;
- a second diamond layer disposed at said distal end of said superhard material, said second diamond layer having a second catalyzing material concentration, said first catalyzing material concentration being greater than said second catalyzing concentration;
- and
- a third diamond layer disposed between said first diamond layer and said second diamond layer, said third diamond layer having a third catalyzing material concentration less than said first catalyzing material concentration and greater than said second catalyzing material concentration;
- wherein at least one of said first diamond layer, said second diamond layer, and said third diamond layer has an inverted cone geometry, where the inverted cone geometry is inverted with respect to the apex of the superhard material and having a center of curvature distal to said at least one layer.
A tip for use in a high impact, wear resistant tool, the tip comprising:
- a substrate having a base end and a non-planar interface spaced apart from said base end;
- and
- a superhard material bonded to said non-planar interface and having a distal end spaced apart from said non-planar interface, said superhard material having a thickness of at least 0.100 inches, and said superhard material having a plurality of diamond layers including:
- a first diamond layer adjacent to said non-planer interface and having a first concave face spaced apart from said non-planar interface, said first diamond layer having a first catalyzing material concentration;
- a second diamond layer adjacent said first concave face, said second diamond layer having a second catalyzing material concentration and a second concave face spaced apart from said first concave face, said second catalyzing material concentration being less than said first catalyzing material concentration;
- a third diamond layer adjacent said second concave face, said third diamond layer having a third catalyzing material concentration and a third concave face spaced apart from said second concave face, said third diamond layer having a third catalyzing material concentration less than said second catalyzing material concentration;
- and
- a fourth diamond layer adjacent said third concave face, said fourth diamond layer having a fourth catalyzing material concentration and an apex spaced apart from said third concave face, said fourth diamond layer having a fourth catalyzing material concentration less than said third catalyzing material concentration
- wherein said concave faces possess an inverted cone geometry with a non-zero value of curvature along their length.
Dependencies are inferred from the claim text.