Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Production of alumina and zirconia composite filaments for 3D printing of scaffolds by Fused Filament Fabrication process
Submission Author:
Jadna Catafesta , RS , Brazil
Co-Authors:
Maíra Faccio, Jadna Catafesta, Janete Zorzi, Carlos Alberto Costa
Presenter: Jadna Catafesta
doi://10.26678/ABCM.COBEM2023.COB2023-1385
Abstract
This work presents the development of a composite filament for the manufacture by 3D printing of alumina and zirconia scaffolds, which were infiltrated with bioglass for later application in the biomedical area. The process was divided into three distinct stages: the production of the filament through the extrusion process with a ceramic/polymer mixture; the use of the filament in the FFF process and the sintering process with bioglass to evaluate the biological properties. The ceramic powders were morphologically evaluated by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The filaments were obtained in a twin-screw extruder by mixing the ceramic powders (55%wt) and the acrylonitrile-butadiene-styrene (ABS) polymer (45%wt) with subsequent characterization by SEM. Using the manufactured filaments, the scaffolds were designed in CAD and printed using the FFF process. Thermogravimetric analysis (TGA) was performed to create the degradation curve in a powder bed in order to remove the polymer from the scaffold. Finally, the scaffolds were subjected to sol-gel infiltration with bioglass, which has a bioactive characteristic inducing regeneration and creating a strong bond when in contact with the tissue, with subsequent characterization by SEM. Preliminary results identified a particle size distribution for alumina between 0.4 - 0.6 μm with irregular geometries and for zirconia particle sizes between 0.09 - 0.2 μm with regular and more spherical geometries. ABS showed characteristics of spherical pellets with varying sizes from 2.5 – 3.5 mm. The filaments obtained obeyed the standard size of 1.75 mm in diameter, showing a uniform and homogeneous distribution of ceramic particles in the polymeric binder. Printing of scaffolds by FFF was carried out with a nozzle size of 1.5 mm, extruder nozzle temperature of 235°C and table temperature of 60°C respectively. The scaffolds were designed with cubic dimensions of 5 x 30 mm (height x width), with filament spacing of 0.300 mm and layer printing orientation of 0°/45°. After, the scaffolds were submitted to a debinding process in a powder bed for 29 hours and final sintering at 1600°C to obtain the fully ceramic piece.
Keywords
Composite filament, 3D printing, Scaffold
