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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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3D Printing of Copper Using Water-Based Colloids and Reductive Sintering.

Lorenzo Airoldi1, Riccardo Brucculeri1, Primo Baldini2

  • 1Department of Civil Engineering and Architecture, Computer, and Biomedical Engineering, University of Pavia, Pavia, Italy.

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|June 22, 2023
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Summary

A novel 3D printing method uses copper oxide colloids to create porous copper objects. This eco-friendly approach avoids toxic solvents and offers potential for applications like lithium battery current collectors.

Keywords:
green 3D printing processlow-cost copper additive manufacturingporous metal copperreduction and sintering processes

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Electrochemistry

Background:

  • Traditional metal-based robocasting often uses toxic volatile solvents.
  • Copper oxide offers a cost-effective and stable precursor for copper metal synthesis.

Purpose of the Study:

  • To develop a low-cost, environmentally friendly 3D printing method for manufacturing copper objects.
  • To explore the use of copper oxide water-based colloids as a precursor material.

Main Methods:

  • Utilized a low-cost 3D printing device with copper oxide water-based colloids.
  • Incorporated Pluronic P123 and poly-acrylic acid to achieve optimal rheological properties.
  • Employed a reductive sintering process at 1000°C in an Ar-10%H2 atmosphere.

Main Results:

  • Successfully manufactured porous copper objects with up to 20% porosity.
  • Retained good mechanical properties in the fabricated copper components.
  • Demonstrated a method that avoids toxic volatile solvents and material waste.

Conclusions:

  • The developed 3D printing technique offers a sustainable and efficient route to produce porous copper.
  • The fabricated copper components show promise for applications such as current collectors in lithium batteries.