US 2016/0097242 A1Published application

Polycrystalline diamond compact cutter

AssigneeCNPC USA Corporation

InventorsLiang ZHAO, Xiaomin CHENG

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Abstract

The polycrystalline diamond compact cutter includes a diamond table and a carbide substrate. Different zones of the diamond table with relative thermal stability and toughness to each other are arranged for a particular cutting efficiency and working life. A thermally stable zone has a metal formation agent removed and forms a top outer ring. A base zone bonds to the carbide substrate on the bottom surface of the diamond table. An anchor zone sets between the thermally stable zone and the base zone, and an absorbing zone extends from the top surface to the base zone. The absorbing zone is circumscribed by the thermally stable zone and the anchor zone. The weight percentage metal content of the anchor zone is less than weight percentage metal content of the base zone. The weight percentage metal content of the base zone is less than weight percentage metal content of the absorbing zone.

Claims20

Dependent claims

A polycrystalline diamond compact cutter, comprising:

a diamond table being comprised of polycrystalline diamond particles and a formation agent, the diamond particles being bonded to other diamond particles and said formation agent, said formation agent being a metal compound, said diamond table having a cylindrical profile with a top surface, a bottom surface, and a working edge around said top surface, said diamond table being comprised of a first portion, a second portion, a third portion, and a fourth portion;
and
a carbide substrate bonded to said bottom surface of said diamond table,
wherein a thermally stable zone comprises said first portion of said diamond table, said thermally stable zone forming at least a part of said top surface so as to form said working edge,
wherein a base zone comprises said second portion of said diamond table, being bonded to said carbide substrate on said bottom surface,
wherein an anchor zone comprises said third portion of said diamond table, being positioned between said thermally stable zone and said base zone,
wherein an absorbing zone comprises said fourth portion of said diamond table, being circumscribed by said thermally stable zone and said anchor zone, extending from said top surface to said base zone, and forming at least another part of said top surface, and
wherein said thermally stable zone extends over said anchor zone and adjacent to said base zone from said top surface, said base zone attaching said anchor zone, said absorbing zone, and said thermally stable zone to said substrate.

5 more elements

A polycrystalline diamond compact cutter, comprising:

a diamond table being comprised of polycrystalline diamond particles and a formation agent, the diamond particles being bonded to other diamond particles and said formation agent, said formation agent being a metal compound, said diamond table having a cylindrical profile with a top surface, a bottom surface, and a working edge around said top surface, said diamond table being comprised of a first portion, a second portion, a third portion, and a fourth portion;
and
a carbide substrate bonded to said bottom surface of said diamond table,
wherein a thermally stable zone comprises said first portion of said diamond table, said thermally stable zone forming at least a part of said top surface so as to form said working edge,
wherein a base zone comprises said second portion of said diamond table, being bonded to said carbide substrate on said bottom surface,
wherein an anchor zone comprises said third portion of said diamond table, being positioned between said thermally stable zone and said base zone,
wherein an absorbing zone comprises said fourth portion of said diamond table, being circumscribed by said thermally stable zone and said anchor zone, extending from said top surface to said base zone, and forming at least another part of said top surface,
wherein said thermally stable zone has a weight percentage metal content less than said anchor zone, said absorbing zone, and said base zone,
wherein said anchor zone has a weight percentage metal content less than said base zone,
wherein said base zone has a weight percentage metal content less than said absorbing zone, and
wherein said absorbing zone has a weight percentage metal content greater than said anchor zone, said base zone, and said thermally stable zone.

8 more elements

Dependencies are inferred from the claim text.