Polycrystalline diamond bodies having annular regions with differing characteristics

Patent metadata

Field	Value
Publication number	US-10704335-B2
Application number	US-201716084582-A
Country	US
Kind code	B2
Filing date	Mar 16, 2017
Priority date	Mar 16, 2016
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Polycrystalline diamond bodies having an annular region of diamond grains and a core region of diamond grains and methods of making the same are disclosed. In one embodiment, a polycrystalline diamond body ( 120 ) includes an annular region ( 142 ) of inter-bonded diamond grains having a first characteristic property and a core region ( 140 ) of inter-bonded diamond grains bonded to the annular region and having a second characteristic property that differs from the first characteristic property. The annular region decreases in thickness from a perimeter surface of the polycrystalline diamond body towards a centerline axis.

First claim

The invention claimed is:

1. A polycrystalline diamond body, comprising:
a working surface, an interface surface, and a perimeter surface;
an annular region of inter-bonded diamond grains that extends away from at least a portion of the working surface and at least a portion of the perimeter surface, wherein the annular region comprises diamond grains having a first catalyst material concentration; and
a core region of inter-bonded diamond grains bonded to the annular region and that extends away from the interface surface, and at least a portion of the core region is positioned radially inward from the annular region,
wherein the core region comprises diamond grains having a second catalyst material concentration that differs from the first catalyst material concentration,
wherein the annular region decreases in thickness from the perimeter surface towards a centerline axis of the polycrystalline diamond body.

2. The polycrystalline diamond body of claim 1 , wherein the annular region terminates at a position along the working surface that is spaced apart from the centerline axis.

3. The polycrystalline diamond body of claim 1 , wherein an intersection between the annular region and the core region comprises a frustoconical portion.

4. The polycrystalline diamond body of claim 1 , wherein an intersection between the annular region and the core region comprises a concave truncated conical portion.

5. The polycrystalline diamond body of claim 1 , wherein an intersection between the annular region and the core region comprises a convex truncated conical portion.

6. The polycrystalline diamond body of claim 1 , wherein an intersection between the annular region and the core region comprises a lobed truncated conical portion.

7. The polycrystalline diamond body of claim 1 , wherein:
the inter-bonded diamond grains are separated from one another by interstitial regions; and
at least a portion of the interstitial regions of the annular region and the core region comprise non-catalyst material.

8. The polycrystalline diamond body of claim 1 , wherein:
the inter-bonded diamond grains are separated from one another by interstitial regions; and
at least a portion of the interstitial regions of the annular region and the core region comprise catalyst material.

9. The polycrystalline diamond body of claim 1 , wherein the annular region has a substantially uniform thickness around the perimeter surface.

10. The polycrystalline diamond body of claim 1 , wherein the annular region is spaced apart from the interface surface.

11. The polycrystalline diamond body of claim 1 , wherein the annular region extends to the interface surface.

12. A polycrystalline diamond body, comprising:
a working surface, an interface surface, and a perimeter surface;
an annular region of inter-bonded diamond grains that extends away from at least a portion of the working surface and at least a portion of the perimeter surface, wherein the annular region comprises diamond grains having a first coefficient of thermal expansion; and
a core region of inter-bonded diamond grains bonded to the annular region and that extends away from the interface surface, and at least a portion of the core region is positioned radially inward from the annular region,
wherein the core region comprises diamond grains having a second coefficient of thermal expansion that differs from the first coefficient of thermal expansion,
wherein the annular region decreases in thickness from the perimeter surface towards a centerline axis of the polycrystalline diamond body.

13. An earth-boring tool, comprising:
a bit body; and
a polycrystalline diamond compact secured to the bit body, the polycrystalline diamond compact comprising:
a working surface, an interface surface, and a perimeter surface;
an annular region of inter-bonded diamond grains that extends away from at least a portion of the working surface and at least a portion of the perimeter surface, wherein the annular region comprises diamond grains having a first catalyst material concentration; and
a core region of inter-bonded diamond grains bonded to the annular region and that extends away from the interface surface, and at least a portion of the core region is positioned radially inward from the annular region,
wherein the core region comprises diamond grains having a second catalyst material concentration that differs from the first catalyst material concentration,
wherein the annular region decreases in thickness from the perimeter surface towards a centerline axis of the polycrystalline diamond body.

Assignees

• Diamond Innovations Inc

Inventors

• Gledhill Andrew
• Long Christopher
• JOHNSON Alexanne

Classifications

• E21B10/567

  with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts · CPC title

• B24D18/0009

  using moulds or presses · CPC title

• B24D18/00

  Manufacture of grinding tools {or other grinding devices}, e.g. wheels, not otherwise provided for · CPC title

• E21B10/5676 Primary

  having a cutting face with different segments, e.g. mosaic-type inserts · CPC title

• E21B10/54

  the bit being of the rotary drag type, e.g. fork-type bits · CPC title