Nanoparticles in binder jetting fabrication of metal objects

An additive manufacturing method, the method comprising:

• spreading a plurality of layers of a powder across a powder bed;
• distributing an ink along at least a portion of each layer as the respective layer of the powder is on top of the powder bed, the ink including first nanoparticles and second nanoparticles,
• the first nanoparticles including a metal oxide,
• the second nanoparticles including a reducing agent of the metal oxide,
• the distribution of the ink in the plurality of layers defining at least one three-dimensional object in the powder bed;
• and
• in the at least one three-dimensional object, reducing at least a portion of the metal oxide to a metal via a reduction reaction with the reducing agent.

A three-dimensional object including:

• a plurality of layers of a powder, the powder including inorganic particles;
• first nanoparticles distributed along at least a portion of each layer of the plurality of layers of the powder, the first nanoparticles including a metal oxide;
• and
• second nanoparticles distributed along at least a portion of each layer of the plurality of layers of the powder, the second nanoparticles including a reducing agent of the metal oxide, and the distribution of the first nanoparticles and the second nanoparticles in the plurality of layers defining the three-dimensional object.