Cutting elements and methods of manufacture thereof
AssigneeCamco International (UK) Limited
InventorsNigel Dennis Griffin, Malcolm Roy Taylor
Life of this patent
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Abstract
A cutting element for a rotary drill bit includes at least one insert of polycrystalline diamond of a kind incorporating a carbonate as a sintering binder-catalyst. The insert is mounted by being at least partly surrounded by a support body of conventional polycrystalline diamond of a kind incorporating a sintering binder-catalyst selected from cobalt and other iron group elements or alloys thereof. The insert and support body may be integrally bonded to a substrate during manufacture. Either the insert or support body may be pre-sintered or sintered during formation of the cutting element.
Claims19
A cutting element including at least one insert of polycrystalline diamond incorporating a carbonate selected from the group consisting of Mg carbonate, Ca carbonate, Sr carbonate, Ba carbonate, and mixtures thereof, as a sintering binder-catalyst, said insert being at least partly surrounded by a support body of polycrystalline diamond incorporating a sintering binder-catalyst selected from iron group elements or alloys thereof.
A cutting element comprising at least one body of polycrystalline diamond incorporating a carbonate selected from the group consisting of Mg carbonate, Ca carbonate, Sr carbonate, Ba carbonate, and mixtures thereof, as a sintering binder-catalyst, the body having a front surface, a rear surface and a peripheral surface, and the rear surface of the body being bonded to a surface of a substrate of a material which is less hard than the material of the body, said body being at least partly surrounded by a support body of polycrystalline diamond incorporating a sintering binder-catalyst selected from iron group elements or alloys thereof.
Dependencies are inferred from the claim text.