Late News Poster Session: On-Demand Additive Manufacturing Poster Session
Program Organizers: MS&T Administration, MS&T PCC
Friday 8:00 AM
October 22, 2021
Room: On-Demand Poster Hall
Location: MS&T On Demand
Poster
Fabrication of Doped β-tricalcium Phosphate Bioceramics by Robocasting for Bone Repair Applications: Nicolas Somers1; Florian Jean1; Marie Lasgorceix1; Anthony Thuault1; Fabrice Petit2; Sandra Balvay3; Christelle Der Loughian3; Claire Gaillard3; Laurent Gremillard3; Anne Leriche1; 1LMCPA/UPHF; 2Belgian Ceramic Research Center; 3I2B/Mateis-INSA Lyon
β-tricalcium phosphate (β-TCP, β-Ca3(PO4)2) is one of the most attractive biomaterials for bone repair because it exhibits excellent biological compatibility, osteoconductivity, and resorbability. Due to its interesting properties, it can be used to produce bone implants serving as temporary supports for bone regeneration. In this work, Mg2+, Sr2+, Cu2+ and Ag+ doped TCP was synthesized to increase its mechanical and biological properties as well as give antibacterial properties.Doped β-TCP macroporous scaffolds were processed by robocasting, a 3D printing technique where 3D objects are built by extruding a filament of paste. Indeed, this additive manufacturing method is an ideal technique for constructing fine and dense ceramic structures with geometrically complex morphology. The printed macroporous scaffolds were sintered by conventionnal and microwave sintering which were compared in terms of density and microstructure. Finally, mechanical and bilogicial properties were conducted on the different doped compositions.
Hybrid Additive/Subtractive System of Ceramic Materials: Investigation of Powder, Process and Innovative Post-treatments: Qirong Chen1; Enrique Juste1; Marie Lasgorceix2; Fabrice Petit1; Anne Leriche2; 1Belgium Ceramic Research Centre; 2Laboratoire des Matériaux Céramiques et Procédés Associés
This work aims at developing a comprehensive understanding of the influence of powder properties and printing parameters on ceramic binder jetting. Alumina powder was used as a model material and was processed by using different routes to obtain granules with various characteristics. Granule properties, characteristics of powder beds, and process parameters were modified and optimized in order to achieve the best quality of printed parts in terms of mechanical strength, microstructure and finished surface. The work also highlights the results of post-impregnation of printed parts with ceramic slurries to enhanced the sintered density. A systematic study was carried out to assess the influence of the internal structures of printed bodies (pores distribution, morphology, pre sintered density) on impregnation efficiency. Densities up to 90% of TD are reported. Laser refining is another innovative post-treatment in the process to refine the periphery of each printed layer.
Poster
Scanning Strategies Investigation for Powder Bed Selective Laser Processing of Alumina: Mohamed Abdelmoula1; Giovanni Urruth2; Gökhan Küçüktürk1; Enrique Juste3; Fabrice Petit3; 1Gazi Univeristy; 2Marion Technologies; 3Belgium Ceramic Reserach Center
Direct-Powder Bed Selective Laser Processing (PBSLP) is considered a promising technique for Additive Manufacturing of Alumina. The process parameters are considered the key for a successful PBSLP of Alumina and needed to be investigated and optimized. In this study, different scanning strategies such as concentric out-in, zigzag, and island have been studied experimentally and numerically. The numerical model was used to determine the suitable process parameters. In terms of relative density, island strategies achieved relative density reached 70% of the theoretical density, with a 16% improvement over other strategies. Also, the Island strategy gave dimensional integrity better than the other strategies with a surface roughness of 0.125 mm measured on the top surface. It can be concluded that the island strategy is more effective in the PBSLP of Alumina. The results from this study will be considered for studying the effect of other process parameters s in a coming study.
Poster
Texture Evolution during the High Temperature Heat Treatment of Additively Manufactured IN718: Selda Nayir1; Bertrand Max2; Simon Perusin2; Todd Palmer1; 1Pennsylvania State University; 2IRT Saint Exupéry, Institut de Recherche Technologique
Nickel base alloys fabricated using powder bed fusion additive manufacturing processes typically display highly oriented grains primarily directed in the dominant orientation of heat flow during processing. These highly oriented grains can produce strong anisotropy in the final components. Age-hardenable nickel alloys undergo a series of high-temperature post-process heat treatments in order to obtain their strength. Through a series of high-temperature heat treatments at temperatures between 1050˚C and 1200˚C, the evolution of the as-deposited grain structure across different orientations with respect to the build direction was evaluated. Surface textures along the build direction rotated from a prominent [001] to [011] direction while the texture perpendicular to build direction remained unchanged along the [011] with increasing temperatures and times. At the same time, the grain sizes and morphologies changed along this same direction transitioned from elongated to equiaxed grains, matching those observed on the plane normal to this orientation.