Electrical resistivity of pure copper processed by medium-powered laser powder bed fusion additive manufacturing for use in electromagnetic applications

Cassidy Silbernagel, Leonidas Gargalis, Ian Ashcroft, Richard Hague, Michael Galea, Phill Dickens

Research output: Journal PublicationArticlepeer-review

51 Citations (Scopus)

Abstract

Pure copper is an excellent thermal and electrical conductor, however, attempts to process it with additive manufacturing (AM) technologies have seen various levels of success. While electron beam melting (EBM) has successfully processed pure copper to high densities, laser powder bed fusion (LPBF) has had difficulties achieving the same results without the use of very high power lasers. This requirement has hampered the exploration of using LPBF with pure copper as most machines are equipped with lasers that have low to medium laser power densities. In this work, experiments were conducted to process pure copper with a 200 W LPBF machine with a small laser spot diameter resulting in an above average laser power density in order to maximise density and achieve low electrical resistivity. The effects of initial build orientation and post heat treatment were also investigated to explore their influence on electrical resistivity. It was found that despite issues with high porosity, heat treated specimens had a lower electrical resistivity than other common AM materials such as the aluminium alloy AlSi10Mg. By conducting these tests, it was found that despite having approximately double the resistivity of commercially pure copper, the resistivity was sufficiently low enough to demonstrate the potential to use AM to process copper suitable for electrical applications.

Original languageEnglish
Article number100831
JournalAdditive Manufacturing
Volume29
DOIs
Publication statusPublished - Oct 2019

Keywords

  • 3D printing
  • Additive manufacturing
  • Copper
  • Electrical conductivity
  • Electrical resistivity
  • Laser powder bed fusion

ASJC Scopus subject areas

  • Biomedical Engineering
  • Materials Science (all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Electrical resistivity of pure copper processed by medium-powered laser powder bed fusion additive manufacturing for use in electromagnetic applications'. Together they form a unique fingerprint.

Cite this