Abstract Fused Filament Fabrication, better known as Fused Deposition Modeling®, is currently the most widespread 3D Printing Technology. There has been a significant demand for developing flame-retardant filaments. Thereby enabling them, for example, in electronics and automotive applications. In this study, commercial PLA filament was modified by the addition of 1, 3 and 5% (%wt.) of expandable graphite. The composites were reprocessed, via extrusion, into filaments for Fused Filament Fabrication. Thermal properties of the filament composites were evaluated by thermogravimetric analysis and differential scanning calorimetry. Mechanical properties of thermo-pressed specimens indicated that no strong adhesion was promoted between the filler and matrix. This is a challenge with expandable graphite reported by many authors. All composites with expandable graphite achieved the V-2 rating of UL-94 flammability test. In spite of this, the results indicated that flammability of the PLA was reduced. All composite filaments were printable and prototypes were successfully 3D printed.

Pós finos de titanato de bário, na composição BaTiO3, foram produzidos por síntese hidrotérmica entre 140°C e 220°C, com tempos variando entre 4 e 20h, com o enchimento crítico das autoclaves. Foram empregadas, na mistura, proporções Ba/Ti de 1,02 e 2,00. Desses pós foram produzidas peças cerâmicas sinterizadas a 1180°C, 1250°C e 1320°C com patamares de 2,5h e taxa de aquecimento de 1°C/min. As densidades das pastilhas cerâmicas de titanato de bário foram determinadas e correlacionadas à temperatura de sinterização. As microestruturas das peças sinterizadas foram observadas por microscopia eletrônica de varredura.

Fine barium titanium oxide powders were produced by the hydrothermal process in temperatures between 140 and 220°C, and times between 4 and 20 hours, for the critical filling of the autoclaves, and Ba/Ti ratios in the mixture of 1.02 and 2.00. The powders were pressed and sintered at 1180, 1250 and 1320°C for 2,5h and a heating rate of 1°C/min. The densities of the sintered bodies were measured and related to the sintering conditions. Microstructures of the ceramic samples were examined by SEM.