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MM: Fachverband Metall- und Materialphysik
MM 65: Additive Manufacturing: Microstructure Development
MM 65.2: Talk
Thursday, March 21, 2024, 17:00–17:15, C 230
On the Road to Hierachically Porous Silicon by Dealloying Additively Manufactured Aluminium-Silicon Alloys — •Manfred May1,2,3, Philipp Timm1, Maria Mailwald4, Dirk Herzog5,6, Ingomar Kelbassa5,6, and Patrick Huber1,2,3 — 1Hamburg University of Technology, Institute for Materials and X-Ray Physics, Hamburg, Germany — 2DESY Centre for X-Ray and Nano Science, Hamburg, Germany — 3Hamburg University, Center for Hybrid Nanostructures, Hamburg, Germany — 4Hamburg University of Technology, Institute of Laser and System Technologies, Hamburg, Germany — 5Hamburg University of Technology, Institute for Industralization of Smart Materials, Hamburg, Germany — 6Fraunhofer, Institute of Additive Production Technologies, Hamburg, Germany
This study focuses on the synthesis of a novel hierarchically porous silicon material through a multi-step approach. Beginning with the selective laser melting fabrication of Al-Si alloys, the subsequent stages involve porosification through dealloying in HCl or KOH, creating a distinctive "coral" structure. Subsequently, another hierarchical layer is introduced via metal-assisted chemical etching or electrochemical anodic etching techniques. Different alloy compositions are investigated, and the impact of the microstructure of the 3D printed alloy for a successful dealloying process is shown. The dealloying process is checked via energy dispersive X-ray spectroscopy and X-ray diffraction experiments. Depending on the alloy composition, specificsurface areas (SSA) between 5.2 m2/g to 48 m2/g are achieved, with an additional increase in SSA up to 22% via anodic etching.
Keywords: dealloying; hierarchichal porous material; porous silicon; additive manufacturing; selective laser melting