In a paper entitled "3D printing dielectric ceramic without a sintering stage," a team of researchers described how they created dielectric ceramic parts using 3D printing while bypassing the often necessary sintering stage.Conventional sintering, they explain, takes time and energy.Typically, ceramic powders are compressed with organic additives and then burned and sintered at high temperatures.The result of this process is that the powder compacts into solid blocks due to thermally assisted mass transport. The time and energy expended by the process is only one of the drawbacks - it is also difficult to control shrinkage, which means extra reshaping of the parts may be needed.
Powder bed melting is the only one step method in the manufacture of ceramic additive.In this paper, the researchers focused on material extrusion.They mixed water-soluble lithium molybdate (Li2MoO4) with water to make a 3D printing paste.
Once a viscous mixture of solid ceramic particles and saturated water forms, the sample tray is 3D printed using a low-cost syringe 3D printer.The surface of the sample is smooth, successful extrusion, good shear performance. The microstructure, density and dielectric properties of printed parts are analyzed.The mixture contains as little water as possible to avoid porosity, as well as cracking and shrinkage, which can occur during a longer drying period.