Rock bit hardmetal overlay and proces of manufacture

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

1999-07-26

2000-04-04

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

B22F 312, B22F 706, B22F 708

Patent

active

060457503

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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