Porous structures printed by fused deposition of granules processed from a novel based-polyamide/alumina system

X. HUNG HUNG; M. A. CAMERUCCI; M.H. TALOU

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2021 vol. 18 p. 1478 - 1489

1546-542X

Alumina ceramic porous structures were shaped by the fused deposition of alumina/polyamide 612 composite granules using an FDM 3D printer with a modified extruderto process granulated powder instead of a filament. The composite granuleswere prepared via thermally induced phase separation (TIPS). Firstly, in order todetermine the proportion of polymer/solvent to be used in the TIPS process, differentvolume fractions of PA612 in dimethyl sulfoxide (DMSO) were studied (0.01 to0.20), and the granules obtained were characterized by SEM, DSC, and Raman spectroscopy. Secondly, the addition of different ceramic loadings to the PA612/DMSOsolution was studied with the aim of determining the amount to be used for preparingthe composite granules by TIPS. In particular, the effect of the alumina contenton the morphology and size of the obtained composite granules was studied. In addition,rheological properties (oscillatory and rotational tests) of the feed materialswere studied. Finally, the printing conditions, including the nozzle temperature andnozzle diameter, and the extrusion process, were optimized in order to obtain porousstructures with good quality. Alumina porous structures were successfully printed,debinded, and sintered. Adequate bonding between layers was achieved, and no defectsat interfaces were detected.