PARTICULATE MIXTURES FOR FORMING POLYCRYSTALLINE COMPACTS AND EARTH-BORING TOOLS INCLUDING POLYCRYSTALLINE COMPACTS HAVING MATERIAL DISPOSED IN INTERSTITIAL SPACES THEREIN

摘要

Polycrystalline compacts include smaller and larger hard grains that are interbonded to fox in a polycrystalline hard material. The larger grains may be at least about 150 times larger than the smaller grains. An interstitial material comprising one or more of a boride, a carbide, a nitride, a metal carbonate, a metal bicarbonate, and a non-catalytic metal may be disposed between the grains. The compacts may be used as cutting elements for earth-boring tools such as drill bits, and may be disposed on a substrate. A particulate mixture includes a first plurality of grains of hard material having a first average grain size of about five hundred nanometers (500 nm) or less and having a coating formed over the grains of hard material. The coating comprises at least one of a boride, a carbide, a nitride, a metal carbonate, a metal bicarbonate, and a non-catalytic metal.

主权项

1. An earth-boring drill bit, comprising:
a bit body; and a plurality of cutting elements attached to the bit body, at least one cutting element of the plurality of cutting elements comprising a hard polycrystalline material including:
a first plurality of grains having a first average grain size;
at least a second plurality of grains having a second average grain size at least one hundred fifty (150) times larger than the first average grain size of the first plurality of grains, the first plurality of grains and the second plurality of grains being interspersed and interbonded with one another to form a polycrystalline hard material; andan interstitial material concentrated around at least some interstitial spaces between the interspersed and interbonded grains of the polycrystalline hard material, the interstitial material comprising at least one of a boride, a nitride, a metal carbonate, a metal bicarbonate, and a non-catalytic metal.