Nozzles including polycrystalline diamond or polycrystalline cubic boron nitride and related assemblies and methods

A nozzle for three-dimensional printing, the nozzle comprising:

• at least one top surface defining an orifice;
• at least one bottom surface opposite the at least one top surface, the at least one bottom surface defining an opening;
• at least one lateral surface extending from or near the at least one top surface to or near the at least one bottom surface;
• at least one conduit surface defining a conduit, the at least one conduit surface extending from the orifice to the opening, at least a portion of the at least one conduit surface comprising at least one of polycrystalline diamond or polycrystalline cubic boron nitride;
• and
• at least one protrusion extending from at least one of the at least one bottom surface or the at least one lateral surface, at least a portion of the at least one protrusion being formed from a superhard material, the superhard material of the at least a portion of the at least one protrusion being configured to at least partially plastically deform a material of a base on which the nozzle is received in order to at least partially form at least one sealing feature between the nozzle and the base and to fixedly secure the nozzle to the base.

A nozzle assembly for three-dimensional printing, the nozzle assembly comprising:

• a base defining a recess and a passageway extending from the recess to an exterior of the base;
• and
• a nozzle disposed in the recess, wherein the nozzle is a unitary sintered structure, the nozzle comprising:
• at least one top surface defining an orifice configured for dispensing printing material out of the nozzle assembly;
• at least one bottom surface opposite the at least one top surface, the at least one bottom surface defining an opening;
• at least one lateral surface extending from or near the at least one top surface to or near the at least one bottom surface;
• and
• at least one conduit surface defining a conduit, the at least one conduit surface extending from the orifice to the opening, at least a portion of the at least one conduit surface comprising at least one of polycrystalline diamond or polycrystalline cubic boron nitride, the conduit of the nozzle in fluid communication with the passageway when the nozzle is disposed in the recess;
• wherein the nozzle is directly secured to the base and at least partially within the recess by a plastically deformed portion of the base extending over a portion of the at least one lateral surface of the nozzle.

A nozzle assembly for three-dimensional printing, the nozzle assembly comprising:

• a nozzle secured to a base in a fixed manner;
• wherein the nozzle comprises:
• at least one top surface defining an orifice;
• at least one bottom surface opposite the at least one top surface, the at least one bottom surface defining an opening;
• at least one lateral surface extending from or near the at least one top surface to or near the at least one bottom surface;
• at least one conduit surface defining a conduit, the at least one conduit surface extending from the orifice to the opening, at least a portion of the at least one conduit surface comprising at least one of polycrystalline diamond or polycrystalline cubic boron nitride;
• and
• at least one protrusion extending from at least one of the at least one bottom surface or the at least one lateral surface, at least a portion of the at least one protrusion being formed from a superhard material, wherein the material of the base adjacent to the at least one protrusion is at least partially deformed;
• wherein the nozzle is attached to the base such that at least one sealing feature is at least partially formed between the nozzle and the base.