| 초록 |
Binder jetting (BJ) is one of 3D printing technologies to manufacture 3D geometries, in which a liquid binding agent is ejected to desired position of substrates. For this process, binder properties and jetting condition affect the formability of the geometries. In general, a binder with low viscosity is accompanied by many satellite droplets after ejection and degrades printing quality. For high viscosity, nozzle clogging occurs due to viscous dissipation. In this study, to develop inorganic binders with appropriate jetting properties, we prepared inorganic binders by adding additives such as humectants to water glass. Physical properties were determined by viscosity, surface tension, and density. In order to investigate jetting properties, we analyzed theoretical-experimental behaviors of ejected droplets by Ohnesorge number and jetting test, respectively. Therefore, we confirmed jettable ranges of the prepared binders with stable droplet formation depending on jetting condition. |
