Porous ceramic structures obtained by using novel polymer-ceramic systems via additive manufacturing technologies

HUNG HUNG, YUK MING X.; GUTIÉRREZ-CAMPOS, DELIA; SANDOVAL, MARÍA LAURA; CAMERUCCI, MARÍA A.; TALOU, MARIANO H.

Cuidad de Panamá

Congreso; Pan American Ceramics Congress and Ferroelectrics Meeting of Americas 2022; 2022

The American Ceramic Society

Additive manufacturing refers to different near-net shape fabrication techniques in which a part is generated from 3D model data by adding material. These technologies allow the direct production of components with complex shapes, which are difficult to fabricate using conventional forming methods. Among them, fused deposition modeling (FDM) and selective laser sintering (SLS) are highlighted in the ceramic processing field. In this context, the design and preparation of appropriate feed systems constitutes still a challenge to solve. In this work, porous ceramic structures developed from novel polymer-ceramic systems via FDM and SLS were obtained. Alumina and polyamide (PA612) powders were used as ceramic and polymeric materials. PA612-alumina granules were prepared by thermally induced phase separation (TIPS) to be used as a printer feed material alternative to the composite filament for FDM, while the PA612-alumina-micrographite granules prepared also by TIPS and then milled and spray dried were used as a new feed system for SLS. Both types of granules were characterized by granulometric distribution, density and SEM/EDS. Printed, burned (800-1200 °C) and sintered (1580 °C) porous ceramic structures were characterized by density and porosity measurements, and SEM. The parts showed good intra and interlayer adhesion, high skeletal densification and macroporous structure control.