| || Dynamic model for flow and droplet deposition in direct ceramic inkjet printing
Author : Mythili, Vijay Soundararajan;Prakasan, K.
Source : Defence Science Journal ; Vol:54(1) ; 2004 ; pp 85-93
Subject : 681.2 Instrumentation;621.38 Electronics
Keywords : Solid freeform fabrication;Microfabrication;Droplet deposition;Ink-jet printing;Intelligent inks;Direct ceramic hybrid electromechanical systems;Ceramic ink-jet printing;DCIJP;CHEMS
Abstract : A rapid fabrication technique, for building microceramic parts, using a drop-on-demand ceramic ink-jet printer is currently under development. This finds application in producing ceramic cores for gas turbines, space applications, and ceramic hybrid electromechanical systems. Another application is in the use of intelligent inks, in which particles assemble themselves so as to interrupt the signals in a particular direction and to produce a suitable output for tactical applications. An attempt has been made to develop a mathematical model for droplet formation from orifice and its deposition on substrate. The distribution of energy supplied to the piezoelectric actuator in the ink-jet print head is modelled and ejected droplet parameters (diameter and velocity) were related to the force imparted by the piezodisc. This model was extended to develop a relation for maximum droplet spread that occurs during impact. Droplet spread determines the lateral resolution of the system and the thickness of each deposited layer.