Polycrystalline diamond compact comprising cemented carbide substrate with cementing constituent concentration gradient

摘要

In an embodiment, a polycrystalline diamond compact includes a cemented carbide substrate including a carbide constituent cemented with a cementing constituent. The cementing constituent has a non-homogenous concentration within the substrate that includes a substantially continuous gradient. A first portion (e.g. at or near a center) of the substrate has a concentration of the cementing constituent that differs from a concentration of the cementing constituent at a second portion (e.g., at or near an outer surface) of the substrate. Thus, the concentration gradient exhibits a substantially smooth gradient, with increasing distance from the first portion of the substrate towards the second portion of the substrate. This provides the substrate with relatively higher wear resistance in one region (e.g., at or near the outer surface) and relatively higher toughness in another region (e.g., at or near the center).

主权项

1. A polycrystalline diamond compact, comprising:
a cemented carbide substrate including a carbide constituent cemented with a cementing constituent, the cemented carbide substrate including:
a first portion of the cemented carbide substrate having a first concentration of the cementing constituent; anda second portion of the cemented carbide substrate laterally spaced from the first portion, the second portion having a second concentration of the cementing constituent that is different than the first concentration of the cementing constituent;wherein the cementing constituent has a concentration exhibiting a substantially continuous concentration gradient between the first portion and the second portion, wherein the substantially continuous gradient is at least partially generally parabolic or at least partially inverted parabolic; and a polycrystalline diamond table bonded to the cemented carbide substrate, the polycrystalline diamond table including a plurality of bonded diamond grains exhibiting diamond-to-diamond bonding therebetween, the plurality of bonded diamond grains defining a plurality of interstitial regions.