Multiscale experimental and numerical approach to the powder particle shape effect on Al-Al2O3 coating build-up - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Thermal Spray Technology Année : 2017

Multiscale experimental and numerical approach to the powder particle shape effect on Al-Al2O3 coating build-up

(1) , (1) , (1) , (1) , (1) , (1) , (1) , (2)
1
2
Mohamed Sennour
Francesco Delloro
Fabrice Gaslain
M. Ducos
  • Fonction : Auteur

Résumé

Aluminum (Al) powders with spherical and irregular particle shapes were mixed with two alumina (Al2O3) powders with either a spherical or an angular particle shape to achieve high-performance cold-sprayed coatings onto steel. Two effects of the aluminum particle shape were observed. First, coating microstructure observation showed impinging heterogeneity depending on particle shape. Second, particle jet differences depending on particle morphology were shown by velocity maps. From the latter, SEM and XRD, three effects of the alumina particle shape were also shown, i.e., higher in-flight velocity of angular particles, fragmentation of spherical hollow particles and embedding of alumina particles with aluminum. Numerical simulation of particle impacts was developed to study the densification of Al coating due to Al2O3 addition through elucidation of Al-Al2O3 interaction behavior at the scale of the coating. Al/Al and Al/Al2O3 interfaces were investigated using TEM to understand coating strengthening effects due to alumina addition at the scale of the particle. As a whole, Al and Al2O3 particle shape effects were claimed to explain coating mechanical properties, e.g., microhardness and coating–substrate bond strength. This study resulted in specifying criteria to help cold spray users in selecting powders for their applications, to meet economic and technical requirements.
Fichier non déposé

Dates et versions

hal-01599718 , version 1 (02-10-2017)

Identifiants

Citer

Pierre-Emmanuel Leger, Mohamed Sennour, Francesco Delloro, François Borit, Antoine Debray, et al.. Multiscale experimental and numerical approach to the powder particle shape effect on Al-Al2O3 coating build-up. Journal of Thermal Spray Technology, 2017, 26 (7), pp.1445-1460. ⟨10.1007/s11666-017-0618-6⟩. ⟨hal-01599718⟩
121 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More