Dense diamond body
View Patent ↗A method of making a dense diamond body comprises the steps of: forming a sintered polycrystalline diamond body with the use of a catalyst; forming voids in the body by removing at least some of the catalyst; and reducing the overall volume of voids by applying pressure and temperature to the body in a vessel substantially free of additional catalysts.
1. A method of making a dense diamond body, comprising:
forming a sintered polycrystalline diamond body with the use of a catalyst;
forming voids having a volume in the sintered polycrystalline diamond body by removing at least some of the catalyst; and
reducing the volume of voids by applying a pressure and a temperature to the sintered polycrystalline diamond body in a vessel substantially free of additional catalysts and substantially free of a carbide substrate to make the dense diamond body.
2. The method of claim 1 , wherein the temperature is at least 1000 degrees Celsius.
3. The method of claim 1 , wherein the pressure is at least 3 GPa.
4. The method of claim 1 , wherein forming voids includes leaching the catalyst material.
5. The method of claim 1 , further comprising bonding the dense diamond body to a cemented metal carbide substrate after reducing the volume of the voids.
6. The method of claim 5 , further comprising placing an infiltrant barrier between the cemented metal carbide substrate and the dense diamond body.
7. The method of claim 5 , wherein bonding the dense diamond body to a cemented metal carbide substrate is done in a press at a temperature lower than 1600 degrees Celsius.
8. The method of claim 5 , wherein bonding the dense diamond body to a cemented metal carbide substrate is done in a press at a pressure lower than 7 GPa.
9. The method of claim 1 , wherein forming the sintered polycrystalline diamond body includes forming multiple sintered polycrystalline diamond bodies in a single can.
10. The method of claim 9 , wherein each sintered polycrystalline diamond body is separated from an adjacent sintered polycrystalline diamond body by a metal layer having a melting temperature above the temperature applied while reducing the volume of voids.
11. The method of claim 1 , further comprising surrounding the vessel with a pressure transferring medium and pre-compacting the vessel at a temperature less than 500 degrees Celsius and a pressure of less than 1 GPa.
12. The dense diamond body of claim 1 , wherein the dense diamond body comprises at least one of a portion with a substantially conical geometry, a substantially cylindrical shape, and a portion with a substantially chisel-shaped geometry.
13. The method of claim 1 , further comprising removing at least 99 percent of the catalyst.
14. The method of claim 1 , further comprising removing at least 25 percent of the catalyst.
15. The method of claim 1 , further comprising attaching the dense diamond body to an electrical component.
16. The method of claim 1 , further comprising attaching the dense diamond body to a driving mechanism.
17. The method of claim 1 , wherein the dense diamond body is not attached to another body during the reducing.
18. A method of making a dense diamond body, comprising:
forming a sintered polycrystalline diamond body with the use of a catalyst;
forming voids having a volume in the sintered polycrystalline diamond body by removing at least some of the catalyst;
applying a first pressure and a temperature to the sintered polycrystalline diamond body in a vessel to reduce the volume of voids and form the dense diamond body; and
after reducing the volume of voids, attaching the dense diamond body to a substrate by applying a second pressure and temperature to the dense diamond body and the substrate;
wherein the dense diamond body is not attached to another body during the applying the first pressure and temperature.
19. A method of making a dense diamond body, comprising:
forming a sintered polycrystalline diamond body with the use of a catalyst;
forming voids having a volume in the sintered polycrystalline diamond body by removing at least some of the catalyst;
applying a pressure and a temperature to the sintered polycrystalline diamond body in a vessel to reduce the volume of voids and form the dense diamond body; and
bonding the dense diamond body to a polycrystalline diamond layer incorporating a catalyst therein;
wherein the dense diamond body is not attached to another body during the applying the pressure and temperature.
20. A method of making a dense diamond body, comprising:
forming a sintered polycrystalline diamond body with the use of a catalyst;
forming voids having a volume in the sintered polycrystalline diamond body by removing at least some of the catalyst; and
reducing the volume of voids by precompacting the sintered polycrystalline diamond body by increasing the pressure alone without an increase in temperature followed by application of both pressure and temperature to form the dense diamond body.