Inserts for earth-boring bits

Details Inserts for earth-boring bits Inserts for earth-boring bits

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21B 10/52 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2289389

A polycrystalline diamond enhanced insert is disclosed. The insert includes a body portion adapted for attachment to an earth-boring bit and a top portion for contacting an earthen formation. The top portion of the insert is provided with two different compositions of polycrystalline diamond. In the primary surface of the top portion, a tougher or less wear-resistant polycrystalline diamond layer is provided, whereas a more wear-resistant polycrystalline diamond layer is provided in the remaining region of the top portion. In addition to polycrystalline diamond, polycrystalline boron nitride and other superhard materials also may be used.

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