Composition for binder material particularly for drill bit bodies
AssigneeSmith International, Inc.
InventorsKuttaripalayam T. Kembaiyan, Thomas W. Oldham
Life of this patent
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Abstract
A composition for drill bit bodies and a method for making drill bits from the composition are disclosed. The composition includes powdered tungsten carbide, and binder metal consisting of a composition by weight of manganese in a range of about zero to 25 percent, nickel in a range of about zero to 15 percent, zinc in a range of about 3 to 20 percent, tin in a range of more than 1 percent to about 10 percent, and copper making up the remainder by weight of the composition. In one embodiment, the composition includes about 6 to 7 percent tin therein. The composition is heated to at least the infiltration temperature in a mold for form a drill bit body.
Claims8
A drill bit, comprising:
- a composite structural body comprising powdered tungsten carbide and binder alloy, said binder alloy comprising a composition by weight of manganese in a range of about zero to 25 percent, nickel in a range of about zero to 15 percent, zinc in a range of about 3 to 20 percent, tin in a range of about 6 to 7 percent, and copper making up the remainder by weight of said composition, said binder alloy infiltrated through said tungsten carbide;
- and
- cutters bonded to said composite structural body.
A method for forming a drill bit body, comprising:
- inserting into a mold a mixture comprising powdered tungsten carbide and a binder alloy consisting of a composition by weight of manganese in a range of about zero to 25 percent, nickel in a range of about zero to 15 percent, zinc in a range of about 3 to 20 percent, tin in a range of about 6 to 7 percent, and copper making up the remainder by weight of the alloy composition;
- and
- heating the mixture to at least an infiltration temperature of the binder alloy to bind the alloy to the powdered tungsten carbide.
Dependencies are inferred from the claim text.