Transition layer polycrystalline diamond bearing

Details Transition layer polycrystalline diamond bearing Transition layer polycrystalline diamond bearing

E - Fixed Constructions

21

B

255/78

E21B 10/56 (2006.01)

Patent

CA 1286655

ABSTRACT OF THE DISCLOSURE An earth boring apparatus is disclosed having bearing members comprised of transition layer polycrys- talline diamond. The transition layer polycrystalline diamond bearings include a polycrystalline diamond layer interfaced with a composite transition layer comprising a mixture of diamond crystals and precemented carbide pieces subjected to high temperature/high pressure conditions so as to form polycrystalline diamond material bonded to the precemented carbide pieces. The polycrystalline diamond layer acts as the bearing surface. The transition layer bearings are preferably supported by a cemented tungsten carbide substrate interfaced with the transition layer.

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