Laser sintering of cold-pressed Cu powder without binder use - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Materialia Année : 2018

Laser sintering of cold-pressed Cu powder without binder use

Résumé

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.

Domaines

Matériaux

Dates et versions

hal-01916743 , version 1 (08-11-2018)

Identifiants

Citer

Loïc Constantin, Lisha Fan, Bruno Mortaigne, Kamran Keramatnejad, Qiming Zou, et al.. Laser sintering of cold-pressed Cu powder without binder use. Materialia, 2018, 3, pp.178-181. ⟨10.1016/j.mtla.2018.08.021⟩. ⟨hal-01916743⟩
21 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More