Polycrystalline diamond compacts, method of fabricating same, and various applications

A polycrystalline diamond compact, comprising:

• a substrate;
• and
• a polycrystalline diamond table including a first polycrystalline diamond layer bonded to the substrate and at least a second polycrystalline diamond layer, the second polycrystalline diamond layer exhibiting a second average diamond grain size that is less than a first average diamond grain size of the first polycrystalline diamond layer, at least an un-leached portion of the polycrystalline diamond table including:
• a plurality of diamond grains defining a plurality of interstitial regions;
• a metal-solvent catalyst occupying at least a portion of the plurality of interstitial regions;
• and
• wherein the plurality of diamond grains and the metal-solvent catalyst collectively exhibit a coercivity of about 115 Oe or more and a specific magnetic saturation of about 15 G·cm3/g or less.

A polycrystalline diamond compact, comprising:

• a substrate;
• and
• a polycrystalline diamond table including a first polycrystalline diamond layer bonded to the substrate and at least a second polycrystalline diamond layer, the first polycrystalline diamond layer including a tungsten-containing material therein, at least an un-leached portion of the polycrystalline diamond table including:
• a plurality of diamond grains defining a plurality of interstitial regions;
• a metal-solvent catalyst occupying at least a portion of the plurality of interstitial regions;
• and
• wherein the plurality of diamond grains and the metal-solvent catalyst collectively exhibit a coercivity of about 115 Oe or more and a specific magnetic saturation of about 15 G·cm3/g or less.