Influence of the Gap between Substrates in the Laser-Induced Transference of High-Viscosity Pastes

Materials

Juan José Moreno-Labella¹  David Munoz-Martin¹  Miguel Morales¹  Carlos Molpeceres¹  Guillermo Vallejo² 

[1] Centro Láser, Universidad Politécnica de Madrid, Alan Turing 1, 28038 Madrid, Spain;Departamento de Física Aplicada e Ingeniería de Materiales, Escuela Técnica Superior de Ingenieros Industriales, José Gutiérrez Abascal 2, 28006 Madrid, Spain;

关键词: laser-induced forward transfer (LIFT);    laser process modeling;    fluid dynamics;    phase-field;    laser direct write;   

DOI  :  10.3390/ma14195567

来源: DOAJ

【 摘 要 】

Laser-induced forward transfer for high-viscosity—of Pa·s—pastes differ from standard LIFT processes in its dynamics. In most techniques, the transference after setting a great gap does not modify the shape acquired by the fluid, so it stretches until it breaks into droplets. In contrast, there is no transferred material when the gap is bigger than three times the paste thickness in LIFT for high-viscosity pastes, and only a spray is observed on the acceptor using this configuration. In this work, the dynamics of the paste have been studied using a finite-element model in COMSOL Multiphysics, and the behavior of the paste varying the gap between the donor and the acceptor substrates has also been modeled. The paste bursts for great gaps, but it is confined when the acceptor is placed close enough. The obtained simulations have been compared with a previous work, in which the paste structures were photographed. The analysis of the simulations in terms of speed allows for predicting the burst of the paste—spray regime—and the construction of a printability map regarding the gap between the substrates.

【 授权许可】

Unknown