Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Void Reduction Strategies in Material Extrusion Additive Manufacturing of Metal Parts: A Review
Submission Author:
Felipe Di Nisio , PR
Co-Authors:
Felipe Di Nisio, Neri Volpato
Presenter: Felipe Di Nisio
doi://10.26678/ABCM.COBEM2023.COB2023-0620
Abstract
Material extrusion (MEX) is one of the most widely used Additive Manufacturing (AM) technologies due to its simplicity and possibility to use low-cost equipment. Recently, it has gained interest in the production of metal parts, where a combination of metal powder and a polymeric matrix is used as feedstock to produce a green part. The green part is then submitted to a debinding process, where the polymer is eliminated from the structure, and then to a sintering process, resulting in a 100% metallic part. Metallic parts obtained this way present undesirable internal voids due to inherent characteristics of the MEX process, even when 100% infill density is used. Developing strategies to reduce void formation is desirable in the metal MEX process since they compromise the mechanical performance of the final part. This review paper investigates void reduction strategies used for metal MEX. The results show that the geometry of deposited filaments is one of the main mechanisms of void formation, and several aspects can influence its dimensions and distributions, such as part geometry, layer height, extrusion width, and tool-path planning. In general, printing speed, extrusion rate, and nozzle temperature are key parameters in this process. This study contributes to the development of metal MEX, as it summarizes the strategies to obtain less porous parts with better mechanical properties. Still, there is room for new developments since only a few studies focused on void reduction in metal parts obtained by MEX.
Keywords
Additive manufacturing, Material Extrusion, metallic 3D printing, Porosity, Mechanical Properties
