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Meeting Materials Science & Technology 2017
Symposium Non Beam-based Additive Manufacturing Approaches for Metallic Parts
Presentation Title Densification and Sintering of Metallic Struts within Micro-trusses 3D-printed from Powder-based Liquid Inks
Author(s) Christoph Kenel, Ramille Shah, David Dunand
On-Site Speaker (Planned) Christoph Kenel
Abstract Scope We study the sintering densification mechanisms of 3D-printed micro-trusses produced by extrusion of inks (consisting of oxide or metallic powders and binder) into continuous, interconnected struts. Upon heat-treatment, the binder is removed, the oxides are reduced to metal powders and the micro-struts are densified by sintering of these metallic powders. Due to low initial powder density, comparably high sintering temperatures and times are needed to achieve near-full densification of the struts resulting in large shrinkage. The sintering process is more complex for cases where a mix of metallic powders (e.g. Fe and Ni) interdiffuses during the sintering process to achieve homogenous alloys (e.g. Fe-Ni). During the heat-treatment, evolution of pore shape, size and fraction, coalescence of powder particles, chemical interdiffusion, and global and local shrinkage are occurring simultaneously. We present here a study, using both metallographic cross-sections and tomographic reconstructions, of the kinetics of, and interactions between, these various processes.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Inkjet Powder Printing of Implantable Biomaterials and Biomedical Device Prototypes
A-16: Binder Jet Printing of Partial Denture Metal Framework from Metal Powder
A-17: Detailed Microstructural and Electrochemical investigation of 3D Printed and Arc Melted 316L Stainless Steel
A-18: High Velocity Hybrid Thermal Spray Systems for 3-D Coatings
A-19: Large-scale Additive Manufacturing of Steel Structures
Additive Manufacturing Evaporative Casting
Additive Manufacturing of High-performance Copper Heat Exchangers via 3D Screen Printing
Additive Manufacturing Technology Based on Stationary Shoulder Friction Stir Welding for Aluminum Alloy
Assessment of Environmental Contamination in Ti-6Al-4V Parts Fabricated from the Laser Hot Wire Process
Binder Jetting 3D Printing: Improving Printer Capabilities and Expanding Available Materials
Densification and Sintering of Metallic Struts within Micro-trusses 3D-printed from Powder-based Liquid Inks
Direct Molten Metal Write of Structurally Significant Materials
Extrusion-based 3D-printing and Sintering of Ni-Mn-Ga and NiTi-Nb Shape Memory Alloys
Grain Growth And Densification Behavior Of 316L Stainless Steel Metallic Components Produced via Binder Jet-powder Printing (3-D) System Using Water Atomized Powders
Integrated Process Line for Fused Filament Fabrication of Metallic Parts Using Metal Powder Loaded Filaments
Large Scale Layered Object Manufacturing – Boundary Conditions for the Joining Process Diffusion Bonding
Mechanisms for Deformation and Film Formation from High Speed Aerosol Deposition of Ag
Metal Additive Manufacturing through Friction Stir-facilitated Deposition
Neutron Diffraction Mapping of Residual Stresses in Large-scale Wire-fed Additively Manufactured Components
Roadmap for Metal Hybrids Net-Shaped via Binder Jet Additive Manufacturing
Slumping during the Sintering of Cantilevered Beams: Experiments and Theory
Ultrasonic Additive Manufacturing State-of-the-Art

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