Rock bit hardmetal overlay and process of manufacture

Details Rock bit hardmetal overlay and process of manufacture Rock bit hardmetal overlay and process of manufacture

1997-10-14

1999-10-19

Neuder, William

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

761082, 175374, E21B 1046

Patent

active

059672480

ABSTRACT:
Methods of forming a new wear and abrasion overlay formed with the steel surfaces of components for earth boring bits, and the components formed by the methods are disclosed. The overlay comprises a hard material particulate containing a metal carbide and an alloy steel matrix. The volume fraction of the hard material particulate in the overlay is greater than about 75%, the average particle size of the hard material particulate is between about 40 mesh and about 80 mesh, and the thickness of the overlay is less than about 0.050 inches. The process of manufacture includes the steps of fixing a monolayer of hard material particulate to the surface of a flexible mold, filling the mold with materials and powders, and CIP densifying to form a preform. The preform is then forged to near 100% density in a rapid solid state densification powder metallurgy process. The resulting bit component has an integrally formed overlay with superior physical properties.

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