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Method of processing a body of polycrystalline diamond material
A method for leaching a polycrystalline diamond (PCD) cutter element having a non-diamond phase comprising a solvent catalyst material, the method comprising: introducing a volume of liquid acid leaching mixture into a leaching receptacle; attaching the PCD cutter element to a fixture; applying a seal member around the PCD cutter element; locating the fixture in the leaching receptacle to suspend the PCD cutter element above the acid leaching mixture; sealing the leaching receptacle to provide a closed system; elevating the temperature of the leaching mixture to a first temperature of between around 100°C to around 300°C to transition at least some of the leaching mixture to acid vapour(s); holding the temperature at said first temperature for a period of time whilst exposing the PCD cutter element to the acid vapour(s) to leach the PCD cutter element; and reducing the temperature to ambient temperature. The seal member may comprise an o-ring. The acid leaching mixture may have a molar concentration of between around 4M to around 9M and comprise hydrochloric acid (HCl), hydrofluoric acid (HF), nitric acid (HNO3), sulfuric acid (H2SO4), and/or phosphoric acid (H3PO4), and water. A polycrystalline diamond construction treated according the method is also defined.
Method of processing a body of polycrystalline diamond material
A method for leaching a polycrystalline diamond (PCD) cutter element having a non-diamond phase comprising a solvent catalyst material, the method comprising: introducing a volume of liquid acid leaching mixture into a leaching receptacle; attaching the PCD cutter element to a fixture; applying a seal member around the PCD cutter element; locating the fixture in the leaching receptacle to suspend the PCD cutter element above the acid leaching mixture; sealing the leaching receptacle to provide a closed system; elevating the temperature of the leaching mixture to a first temperature of between around 100°C to around 300°C to transition at least some of the leaching mixture to acid vapour(s); holding the temperature at said first temperature for a period of time whilst exposing the PCD cutter element to the acid vapour(s) to leach the PCD cutter element; and reducing the temperature to ambient temperature. The seal member may comprise an o-ring. The acid leaching mixture may have a molar concentration of between around 4M to around 9M and comprise hydrochloric acid (HCl), hydrofluoric acid (HF), nitric acid (HNO3), sulfuric acid (H2SO4), and/or phosphoric acid (H3PO4), and water. A polycrystalline diamond construction treated according the method is also defined.
Method of processing a body of polycrystalline diamond material
DAVID THOMAS FORD (author) / DAVID WILLIAM ALDMINGTON (author) / CARMEN ELENA ZVORISTE-WALTERS (author) / JONATHAN JAMES BIDDULPH (author)
2024-07-31
Patent
Electronic Resource
English
IPC:
C23F
Nichtmechanisches Entfernen metallischer Stoffe von Oberflächen
,
NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
B24D
TOOLS FOR GRINDING, BUFFING OR SHARPENING
,
Werkzeuge zum Schleifen, Polieren oder Schärfen
/
C04B
Kalk
,
LIME
/
C22C
Legierungen
,
ALLOYS
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