Polycrystalline diamond apparatuses and methods of manufacture

A rotary drill bit for drilling a subterranean formation, comprising:

• a bit body comprising a leading end having generally radially extending blades structured to facilitate drilling of a subterranean formation;
• at least one cutting element comprising a substrate including a volume of polycrystalline diamond bonded to the substrate and having a catalyst material dispersed substantially throughout the volume of polycrystalline diamond, a majority of the volume of polycrystalline diamond comprising diamond grains approximately 2 μm or larger, the volume of polycrystalline diamond further comprising at least some unconverted fullerenes, and wherein the volume of polycrystalline diamond being formed by a method comprising:
• providing a mixture comprising:
• at least 80% by weight diamond;
• and
• fullerenes;
• exposing the mixture to a pressure of at least about 60 kilobar;
• exposing the mixture to a temperature exceeding 1350° Celsius.

A polycrystalline diamond compact comprising:

• a volume of polycrystalline diamond bonded to a substrate;
• and
• a catalyst material dispersed substantially throughout the volume of polycrystalline diamond;
• wherein a majority of the volume polycrystalline diamond comprises diamond grains approximately 2 μm or larger, the volume of polycrystalline diamond further comprising at least some unconverted fullerenes, and wherein the volume of polycrystalline diamond includes less than about 1% by weight carbon in a non-fullerenes, non-diamond form.

A polycrystalline diamond compact comprising:

• a volume of polycrystalline diamond bonded to a substrate;
• and
• a catalyst material dispersed substantially throughout the volume of polycrystalline diamond;
• wherein a majority of the volume of polycrystalline diamond comprises diamond grains approximately 2 μm or larger, the volume of polycrystalline diamond further comprising at least some unconverted fullerenes, and wherein the volume of polycrystalline diamond is substantially free of non-fullerenes, non-diamond carbon.

A polycrystalline diamond compact comprising:

• a volume of polycrystalline diamond bonded to a substrate;
• and
• a catalyst material dispersed substantially throughout the volume of polycrystalline diamond;
• wherein a majority of the volume of polycrystalline diamond comprises diamond grains approximately 2 μm or larger, the volume of polycrystalline diamond further comprising at least some unconverted fullerenes, and wherein the volume polycrystalline diamond exhibits a diamond volume fraction exceeding about 90%.

A polycrystalline diamond compact comprising:

• a volume of polycrystalline diamond bonded to a substrate;
• and
• a catalyst material dispersed substantially throughout the volume of polycrystalline diamond;
• wherein a majority of the volume of polycrystalline diamond comprises diamond grains approximately 2 μm or larger, and wherein the volume of polycrystalline diamond comprises at least some unconverted fullerenes.