• Petit, Fabrice
• Chen, Qirong
• Leriche, Anne
• Juste, Enrique
• Lasgorceix, Marie

Abstract

International audience ; As the conventional binder jetting method is limited in terms ofachievable density and finish surface, a new concept of hybridsubtractive/additive manufacturing system has been recentlydeveloped. The system relies on a modified binder jetting machinewhich integrates a slurry-based deposition system and a pulsedlaser. The slurry-based deposition system is a spray device whichcan be an alternative to the recoating blade traditionally used tospread layers of coarse powder. By using slurry containing fineceramic grains, thin layers of highly packed powder can be obtainedwhich is highly beneficial to improve the sintered density of printedparts. The other limitation of binder jetting is the rough finishsurface. Thanks to the smallness of the spot size, a pulsed laser isa good option to refine the contour of each printed layers thusenhancing the overall part resolution and smoothness.The present work exhibits some preliminary results obtainedusing this new concept of hybrid machine. Parts made in aluminahave been produced demonstrating the advantages and currentlimitations of the new approach. Alumina powders have beenprocessed to change the particle size, distribution and morphologyin order to assess the influence of these characteristics on printingbehavior. Furthermore, process parameters were studied suchas layer thickness, deposited amounts of binder on each layer,spreading speed of recoater. This work also reports the results ofthe first tests using the laser to refine the borders of each printedlayer. The influence of this treatment on the finished surface of thesintered parts is highlighted.

Topics

• Deposition
• density
• impedance spectroscopy
• morphology
• surface
• grain
• ceramic
• binder jetting