Method for producing a pcd compact

B - Operations – Transporting – 01 – J

Patent

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B01J 3/06 (2006.01) B22F 7/06 (2006.01)

Patent

CA 2711429

A method of producing a composite diamond compact comprising a polycrystalline diamond (PCD) compact bonded to a cemented carbide substrate is provided. The method includes the steps of: providing a PCD table, preferably a PCD table with diamond-to-diamond bonding and a porous microstructure in which the pores are empty of second phase material bringing together the PCD table and a cemented carbide substrate in the presence of a bonding agent to form an unbonded assembly; subjecting the unbonded assembly to an initial compaction at a pressure of at least 4.5 GPa and a temperature below the melting point of the bonding agent for a period of at least 150 seconds; and thereafter subjecting the unbonded assembly to a temperature above the melting point of the bonding agent and a pressure of at least 4.5 GPa for a time sufficient for the bonding agent to become molten and bond the PCD table to the substrate to form a composite diamond compact.

Linvention concerne un procédé de fabrication dun diamant composite compact qui comprend un diamant polycristallin (PCD) compact relié à un substrat de carbure cimenté. Le procédé comprend les étapes consistant à : mettre à disposition une table de PCD, de préférence une table de PCD à liaison diamant-diamant et ayant une microstructure poreuse dont les pores sont exempts de matériau de seconde phase ; assembler la table de PCD et un substrat de carbure cimenté en présence dun agent de liaison pour former un ensemble non lié ; soumettre lensemble non lié à un compactage initial à une pression dau moins 4,5 GPa et à une température inférieure au point de fusion de lagent de liaison pendant une durée dau moins 150 secondes ; puis soumettre lensemble non lié à une température supérieure au point de fusion de lagent de liaison et à une pression dau moins 4,5 GPa pendant une durée suffisante pour que lagent de liaison fonde et relie la table de PCD au substrat pour former un diamant composite compact.

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