Dense glass-ceramic articles via additive manufacture of glass frit

An additive manufacturing process, comprising:

• building a 3D structure from a printing material, the printing material comprising a binder composition and a glass frit comprising at least 50 wt. % SiO2, at least 30 wt. % CaO, and at least 10 wt. % ZrO2, the building comprising:
• printing a layer of the printing material on a substrate to form a cross-section of the 3D structure;
• curing selected portions of the layer of printing material to form printed regions, the cross-section further including unprinted regions comprising uncured portions of the layer of printing material;
• and
• repeatedly printing a subsequent layers of the printing material to form a plurality of cross-sections of the 3D structure, each cross section of the plurality of cross-sections comprising printed regions and unprinted regions, each cross-section of the plurality of cross-sections being formed on a previously formed one of the plurality of cross-sections;
• cleaning the 3D structure to remove uncured resin from the 3D structure;
• debinding the 3D structure to form a porous 3D structure;
• sintering the porous 3D structure to form a sintered 3D structure;
• and
• forming a glass-ceramic article from the sintered 3D structure.