Laser sintering of cold-pressed Cu powder without binder use

Loic Constantin, Lisha Fan, Bruno Mortaigne, Kamran Keramatnejad, Qiming Zou, Clio Azina, Yong Feng Lu, Jean François Silvain

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

In this work, laser sintering (LS) of cold-pressed copper (Cu) powder without using a binder was demonstrated. To promote the densification of the final part, the Cu powder was cold pressed beforehand, thereby forming a densely packed powder bed for the LS. The densification and microstructural evolution study show that the cold-pressed powder led to an increase of up to 11% in the relative density and a decrease of 10 times in the surface roughness. The influence of the scan speed on the densification and sintering quality was studied. A relatively slow scan speed, 25 µm/s, allowed sufficient atomic diffusion during the LS process and ultimately produced dense Cu parts without cracks and open pores. The introduction of the cold-pressing step into the LS process is critical for achieving high-density powder metallurgy parts without using binders.

Original languageEnglish (US)
Pages (from-to)178-181
Number of pages4
JournalMaterialia
Volume3
DOIs
StatePublished - Nov 2018

Keywords

  • Cold pressing
  • Copper powder
  • Densification
  • Laser sintering (LS)

ASJC Scopus subject areas

  • Materials Science(all)

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    Constantin, L., Fan, L., Mortaigne, B., Keramatnejad, K., Zou, Q., Azina, C., Lu, Y. F., & Silvain, J. F. (2018). Laser sintering of cold-pressed Cu powder without binder use. Materialia, 3, 178-181. https://doi.org/10.1016/j.mtla.2018.08.021