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US 6,772,849 B2Granted
Protective overlay coating for PDC drill bits
AssigneeSmith International, Inc.
InventorsThomas W. Oldham, Kumarj T. Kembaiyan
Life of this patent
Estimating the term…
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AssigneeSmith International, Inc.
InventorsThomas W. Oldham, Kumarj T. Kembaiyan
Estimating the term…
In one embodiment, a method of increasing a durability of a drill bit having a bit body with at least one blade disposed thereon, at least one cutter pocket disposed on the blade, and at least one cutter disposed in the cutter pocket is disclosed. The method includes brazing the at least one cutter to the at least one cutter pocket so that a braze material disposed between the at least one cutter pocket and the at least one cutter comprises an exposed surface, and overlaying at least a portion of the exposed surface with a hardfacing material, wherein the hardfacing material includes a binder having a melting point selected to avoid damaging the cutter. In one embodiment, a rock bit including a matrix bit body having at least one blade thereon, at least one cutter pocket disposed on the blade, at least one cutter disposed in the cutter pocket, a braze material disposed between the cutter and the pocket, the braze material having an exposed surface, and an overlay coating applied proximate to the at least one cutter, wherein the overlay coating is adapted to cover an exposed surface of braze material proximate to the at least one cutter is disclosed.
A method of increasing a durability of a drill bit having a bit body, with at least one blade disposed thereon, at least one cutter pocket disposed on the blade, and at least one polycrystalline diamond compact cutter disposed in the cutter pocket, the method comprising:
A drill bit comprising:
A drill bit comprising:
Dependencies are inferred from the claim text.