Robocasting of highly porous ceramics scaffolds with hierarchized porosity AITranslate

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DOI：https://doi.org/10.1016/j.addma.2020.101776

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A novel hybrid process combining robocasting and starch-consolidation method, enabling the fabrication of ceramic scaffolds with porosity as high as 85%, is developed and applied to the fabrication of zirconia. This process enables a precise control of the volume and size of the porosity. It also allows its hierarchization over 4 decades of length scales and up to three porosity families: i – macroscopic, from 100 µm to 2 mm and controlled by the robocasting design, ii – micronic, from 2 µm to 70 µm and controlled through the addition of starches as pore former in the printing past, and iii – sub-micronic, with a characteristic size of 200 nm and induced by a partial sintering step. The high porosity fraction and the precise control of its size distribution are above those usually found in porous ceramics fabricated with robocasting. Mechanicals properties of such porous scaffolds, investigated in compressive testing, depend both on the porous fraction and pores shape. Moreover, they are closely related to those of individual filaments produced by the same robocasting process. Thus, additive manufacturing combined with more conventional porous ceramics fabrication techniques show a big step forward for both increasing and tailoring the porosity in order to produce complex porous structures necessary for various applications in bio-medical or energy storage fields. Graphical Download : Download high-res image (356KB) Download : Download full-size image