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Related Concept Videos

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Isomerism in Complexes
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Related Experiment Video

Updated: Jan 30, 2026

Planar and Three-Dimensional Printing of Conductive Inks
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Multi-Material Direct Ink Writing (DIW) for Complex 3D Metallic Structures with Removable Supports.

Chao Xu1, Bronagh Quinn1, Louis Laberge Lebel1

  • 1Mechanical Engineering , Polytechnique Montreal , C.P. 6079, succ. Centre-Ville , Montreal , Québec H3C 3A7 , Canada.

ACS Applied Materials & Interfaces
|January 29, 2019
PubMed
Summary

Multi-material direct ink writing (DIW) enables complex 3D steel structures using removable supports. Copper infiltration enhances conductivity and stiffness, while alumina supports prevent contamination.

Keywords:
additive manufacturingcomplex 3D metallic structuresdirect ink writingmulti-materialremovable support

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • 3D Printing

Background:

  • Direct ink writing (DIW) is an accessible additive manufacturing (AM) method for metallic structures.
  • Single-material DIW struggles with creating complex 3D structures due to inseparable support materials after thermal treatment.

Purpose of the Study:

  • To develop a multi-material DIW method for fabricating complex 3D steel structures with removable supports.
  • To investigate the impact of different support materials (copper and alumina) on steel structure properties.

Main Methods:

  • Developed a multi-material DIW process using steel as the primary material.
  • Utilized lower melting temperature copper or ceramic (alumina) as removable support materials.
  • Post-deposition thermal treatments were applied to the printed structures.

Main Results:

  • Copper infiltration resulted in a hybrid steel-copper structure, improving electrical conductivity by 400% and mechanical stiffness by 34%.
  • Alumina supports were physically and chemically stable, providing removable support without contaminating the steel structure.
  • Characterized dimensional shrinkage, surface roughness, filament porosity, electrical conductivity, and tensile properties.

Conclusions:

  • Multi-material DIW with removable supports is a viable method for fabricating complex 3D steel structures.
  • Copper infiltration offers significant enhancements in electrical and mechanical properties.
  • Alumina supports provide a clean and effective method for creating intricate geometries in steel AM.