Polycrystalline diamond elements and systems and methods for fabricating the same

A method of fabricating a polycrystalline diamond element, the method comprising:

• placing diamond particles in a diamond particulate volume into a pressure transmitting medium, the diamond particulate volume comprising:
• a first volume of the diamond particles including a material comprising a group 13 element;
• and
• a second volume of the diamond particles having a lower concentration of the material comprising the group 13 element than the first volume of the diamond particles;
• positioning the second volume of the diamond particles to define at least a portion of a working surface of the polycrystalline diamond element;
• enclosing the diamond particles in the diamond particulate volume in the pressure transmitting medium to define a cell assembly;
• subjecting the cell assembly to a high-pressure/high-temperature process to define a polycrystalline diamond table;
• and
• leaching at least a portion of the polycrystalline diamond table.

A method of fabricating a polycrystalline diamond element, the method comprising:

• placing diamond particles in diamond particulate volume into a pressure transmitting medium, the diamond particulate volume comprising:
• a first volume of the diamond particles including a material comprising a group 13 element;
• and
• a second volume of the diamond particles having a lower concentration of the material comprising the group 13 element than the first volume of the diamond particles;
• positioning the diamond particles in the diamond particulate volume in the pressure transmitting medium adjacent to a substrate;
• positioning the first volume of the diamond particles between the second volume of diamond particles and the substrate;
• enclosing the diamond particles in the diamond particulate volume in the pressure transmitting medium to define a cell assembly;
• subjecting the cell assembly to a high-pressure/high-temperature process to define a polycrystalline diamond table;
• and
• leaching at least a portion of the polycrystalline diamond table.

A method of fabricating a polycrystalline diamond element, the method comprising:

• placing a diamond particulate volume into a pressure transmitting medium, the diamond particulate volume comprising:
• a first volume of diamond particles including an interstitial material;
• and
• a second volume of diamond particles having a lower concentration of the interstitial material than the first volume of diamond particles, the second volume of the diamond particles positioned to define at least a portion of a working surface of the polycrystalline diamond element;
• enclosing the first volume of diamond particles and the second volume of diamond particles in the pressure transmitting medium to define a cell assembly;
• subjecting the cell assembly to a high-pressure/high-temperature process to define a polycrystalline diamond table;
• leaching at least a portion of the polycrystalline diamond table to define a leached portion of the polycrystalline diamond table and a substantially unleached portion of the polycrystalline diamond table;
• and
• defining a non-linear boundary between at least one of:
• the leached portion and the substantially unleached portion of the polycrystalline diamond table;
• the first volume of diamond particles and the second volume of diamond particles of the diamond particulate volume.