Superabrasive elements and methods for processing and manufacturing the same using protective layers
View Patent ↗An exemplary method of processing a polycrystalline diamond element is disclosed. According to the method, a protective layer may be formed over only a selected portion of a polycrystalline diamond element. The polycrystalline diamond element may include a polycrystalline diamond table. At least a portion of the polycrystalline diamond element may be exposed to a leaching solution such that the leaching solution contacts an exposed surface region of the polycrystalline diamond table and at least a portion of the protective layer. The protective layer may be substantially impermeable to the leaching solution. An exemplary method of manufacturing a polycrystalline diamond element is also disclosed.
1. A method of manufacturing a polycrystalline diamond element, the method comprising:
forming a protective layer over a selected portion of a polycrystalline diamond element during sintering of a polycrystalline diamond table of the polycrystalline diamond element;
exposing at least a portion of the polycrystalline diamond element to a leaching solution such that the leaching solution contacts an exposed surface region of the polycrystalline diamond table and at least a portion of the protective layer;
wherein the protective layer is substantially impermeable to the leaching solution.
2. The method of claim 1 , wherein forming the protective layer over the selected portion of the polycrystalline diamond element during sintering of the polycrystalline diamond table comprises:
disposing a particulate mixture comprising diamond particles adjacent to a material for forming the protective layer;
sintering the particulate mixture to form the polycrystalline diamond table such that the protective layer is formed over at least a portion of a surface of the polycrystalline diamond table.
3. The method of claim 2 , wherein forming the protective layer over the selected portion of the polycrystalline diamond element during sintering of the polycrystalline diamond table further comprises:
disposing the particulate mixture comprising diamond particles adjacent to a substrate;
wherein the selected portion comprises at least a portion of the substrate.
4. The method of claim 1 , wherein the protective layer is bonded to the substrate.
5. The method of claim 3 , wherein the protective layer is formed over the selected portion of the polycrystalline diamond element such that the protective layer substantially encloses and contacts the substrate.
6. The method of claim 1 , wherein the protective layer extends to immediately adjacent a chamfered edge of the polycrystalline diamond table.
7. The method of claim 1 , wherein the selected portion comprises at least a portion of a surface of the polycrystalline diamond table.
8. The method of claim 1 , wherein:
the polycrystalline diamond element further comprises a substrate bonded to the polycrystalline diamond table;
the selected portion comprises at least a portion of a surface of the substrate.
9. The method of claim 1 , wherein the protective layer comprises a substantially inert material.
10. The method of claim 1 , wherein forming the protective layer over the selected portion of the polycrystalline diamond element comprises exposing the protective layer to an elevated temperature and an elevated pressure,
wherein:
the elevated temperature comprises a temperature of about 50° C. or higher;
the elevated pressure comprises a pressure of about 1000 psi or higher.
11. The method of claim 1 , wherein an intercalated hybrid layer is formed at an interface between the protective layer and the polycrystalline diamond element.
12. The method of claim 11 , wherein the intercalated hybrid layer comprises portions of the protective layer disposed between portions of the polycrystalline diamond element.
13. The method of claim 11 , wherein the intercalated hybrid layer comprises portions of the protective layer disposed within cavities defined in the polycrystalline diamond element.
14. The method of claim 1 , further comprising chamfering an edge portion of the polycrystalline diamond table.
15. The method of claim 14 , wherein chamfering the edge portion of the polycrystalline diamond table comprises:
making a reference mark on a portion of the polycrystalline diamond element;
grinding the edge portion of the polycrystalline table with a centerless grinder, the centerless grinder utilizing the reference mark as a location indicator.
16. The method of claim 1 , wherein the protective layer comprises a metallic material.
17. The method of claim 16 , wherein the metallic material comprises at least one of:
a refractory metal;
a precious metal;
a steel alloy;
a steel derivative alloy.
18. The method of claim 1 , wherein the protective layer comprises a glass sealant.
19. The method of claim 1 , wherein the protective layer comprises graphite.
20. The method of claim 1 , further comprising forming an outer layer on at least a portion of an outer surface of the protective layer.