Polycrystalline diamond bodies having annular regions with differing characteristics
View Patent ↗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.
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.