Graduate Seminar Series
March 24, 2023
10:00 a.m. ET
Extrusion 3D-Printing: from Oxide Inks to Metallic Micro-lattices
To create metallic scaffolds or microlattices with sub-millimeter strut architectures, we develop a new method, Extrusion 3D-Printing, consisting of two simple steps. First, metal oxide particle suspensions (inks) are extruded, in air and at ambient temperature, into linear struts creating self-supporting lattices. Second, the oxides are hydrogen-reduced to metal and sintered into dense metallic microlattices.
We describe here micro-lattices made of pure metals – copper, iron, nickel or tungsten - created from inks consisting of the respective metal oxides. In all cases, thermochemical reduction and sintering of the 3D-printed oxide scaffolds results in large shrinkages (up to 80% by volume) but without cracking or distortion, as investigated via in-situ x-ray tomography.
We also demonstrate metallic alloys, using blends of oxides: Fe-20Ni-5Mo (a steel) and Co-Cr-Fe-Ni (a high-entropy alloy) and study, via in-situ x-ray diffraction, the interdiffusion resulting in homogenous alloys. Finally, we present more complex tungsten geometries, i.e., gyroids with triply periodic minimal surfaces.
David Dunand, Professor of Materials Science and Engineering, Northwestern University
David Dunand received his BS/MS degree at the Swiss Federal Institute of Technology (ETH, Zurich) in 1986 and his Ph.D. from the Massachusetts Institute of Technology (MIT) in 1991, both in materials science and engineering. After serving on the MIT faculty, he joined Northwestern University (NU) in 1997 where he is Professor in the Department of Materials Science and Engineering. His research focuses on the processing, microstructure and mechanical properties of metallic alloys, composites, and foams. Dunand is a fellow of TMS and ASM International, the recipient of the 2009 Distinguished Scientist/Engineering Award (Structural Materials Division of TMS), the 2012 winner of the Materials Science & Engineering A Journal Prize, and twice a departmental Teacher of the Year at NU. He is co-founder of NanoAl, LLC, a start-up aluminum company which was acquired in 2018 by Unity Aluminum, now part of Steel Dynamics, Inc.
Upcoming Events
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September 18 2024
7:45 AM ET
Materials Science and Engineering
Fermi Level Engineering in Yttrium and Vanadium Co-doped BaTiO3 for Use in Multi-Layered Ceramic Capacitors, presented by Andrew Aumen
2327 Wean Hall
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September 20 2024
12:45 PM ET
Materials Science and Engineering
Can Unknown Materials Properties Be Accurately Predicted?, presented by Zi-Kui Liu, Penn State University
Wean Hall 7500
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September 23 2024
1:00 PM ET
Materials Science and Engineering
Combat Hot Cracking in Additive Manufacturing, presented by Guannan Tang
2327 Wean Hall, Mehl Room
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September 27 2024
12:45 PM ET
Materials Science and Engineering
"Unveiling the Future of Color Matching: PPG Digitization, Color Physics, and AI insights," presented by Chris Childs, PPG
Wean Hall 7500
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October 4 2024
12:45 PM ET
Materials Science and Engineering
"Deconstructing Meritocracy: Unpacking Attacks on Diversity, Equity, and Inclusion," presented by John Herbert, Ohio State University
Wean Hall 7500
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October 11 2024
12:45 PM ET
Materials Science and Engineering
Seminar presented by Zakaria Al Balushi, University of California, Berkley
Wean Hall 7500