11:25 AM - CP08.02.03
Spotlight Talk—Corrosive Microstructurization of Nickel-Copper Gas Atomized Powders
Stanislau Niauzorau1,Aliaksandr Sharstniou1,Bruno Azeredo1
Arizona State University1
Microtextured and mesoporous metal alloys, due to its high surface area, have been widely used as fast-charging anodes for Li-ion batteries , as metal electrodes for electrolytic methane production , and for electrocatalysis applications . In recent years, there has been a growing interest in designing architected and hierarchical metal electrodes by integrating wet-chemical methods  with 3D printing techniques in order to design and scale topologically complex catalyst systems  with increased surface area . In this study, we examine a specific corrosion-based wet chemistry to induce the microtexturization of gas atomized metal alloy powder as a strategy to introduce surface roughness at microscales to AM feedstock intended for use in selective laser sintering. Microstructurization of NiCu powders was done by electroless chemical etching in 1M HNO3 with the formation of roughened surfaces with RMS at length scales from 20 nm to 5 μm. Additionally, post-processing of the etched microtextured powders in diluted HNO3 reduced the oxygen content from 4 % to 1 % by mass compared to the initial content present in the gas atomized metal powder. Thereby, development of the new controllable chemistry for modification and microtexturing of oxygen-free metal powders may be a promising way for fabrication of the new high surface area metal feedstock for 3D printing of high-surface area electrodes.
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