Abrasive wear-resistant materials and earth-boring tools comprising such materials

摘要

An abrasive wear-resistant material includes a matrix and sintered and cast tungsten carbide pellets. A device for use in drilling subterranean formations includes a first structure secured to a second structure with bonding material. An abrasive wear-resistant material covers the bonding material. The first structure may include a drill bit body and the second structure may include a cutting element. A method for applying an abrasive wear-resistant material to a drill bit includes providing a bit, mixing sintered and cast tungsten carbide pellets in a matrix material to provide a pre-application material, heating the pre-application material to melt the matrix material, applying the pre-application material to the bit, and solidifying the material. A method for securing a cutting element to a bit body includes providing an abrasive wear-resistant material to a surface of a drill bit that covers a brazing alloy disposed between the cutting element and the bit body.

主权项

1. An abrasive wear-resistant material comprising the following materials in pre-application ratios:
a matrix material, the matrix material comprising between about 20% and about 50% by weight of the abrasive wear-resistant material, the matrix material comprising at least 75% nickel by weight, the matrix material having a melting point of less than about 1100° C.; a plurality of −20 ASTM mesh sintered tungsten carbide pellets substantially randomly dispersed throughout the matrix material, the plurality of sintered tungsten carbide pellets comprising between about 30% and about 55% by weight of the abrasive wear-resistant material, each sintered tungsten carbide pellet comprising a plurality of tungsten carbide particles bonded together with a binder alloy, the binder alloy having a melting point greater than about 1200° C.; and a plurality of −100 ASTM mesh cast tungsten carbide pellets substantially randomly dispersed throughout the matrix material, the plurality of cast tungsten carbide pellets comprising between about 15% and about 35% by weight of the abrasive wear-resistant material.