Powder particle–wall collision-based design of the discrete axial nozzle-exit shape in direct laser deposition

Jeromen, Andrej (avtor), Vidergar, Ana (avtor), Fujishima, Makoto (avtor), Levy, Gideon N. (avtor), Govekar, Edvard (avtor)

To improve the efficiency of the direct laser deposition (DLD) of metal powders, a concentrated powder-stream distribution is required, which can be affected by the shape of the powder-delivery nozzle. In this study, a simplified, powder particle–wall collision-based 3D numerical model of the powder flow in the nozzle was used to simulate the influences of the nozzle-exit shape on the concentration of the powder stream distribution, characterized by its diameter. The nozzle-exit shape was parametrized by the exit-cone angle, length, and inner-surface roughness. Based on the simulation results, the nozzle-exit shapes of three exit-cone angles (0°, 3.5° and 7.2°), various lengths and surface-roughness values were designed. For the two larger particle sizes of 22 μm and 82 μm considered, the wall-collision-dominated regime and the influence of the nozzle-exit shape were experimentally confirmed. In particular, a significant decrease in the powder-stream diameter when increasing the divergent nozzle-exit cone angle or decreasing its surface roughness and the nonlinear influence of the cone length were shown. Using single-layer, powder-deposition experiments it was demonstrated that by modifying the design of the nozzle-exit shape, the powder-catchment efficiency was increased by 13% due to the increased nozzle-exit cone angle and by 19% due to the reduced surface roughness.

• Jezik: Angleški jezik
• Ključne besede: direct laser deposition, axial nozzle shapes, wall-collision-dominated flow, powder-stream distribution, powder-catchment efficiency
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 13 str.
• Številčenje: Vol. 308, art. 117704
• PID: 20.500.12556/RUL-138253
• UDK: 621.7
• ISSN pri članku: 0924-0136
• DOI: 10.1016/j.jmatprotec.2022.117704
• COBISS.SI-ID: 114823683
• Datum objave v RUL: 13.07.2022

Gradivo je del revije

• Naslov: Journal of materials processing technology
• Skrajšan naslov: J. mater. process. technol.
• Založnik: Elsevier
• ISSN: 0924-0136
• COBISS.SI-ID: 30105600

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: neposredno lasersko nanašanje, aksialna oblika šob, trčenje sten v prevladujočem toku, porazdelitev toka prahu, učinkovitost zajemanja prahu

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0241
• Naslov: Sinergetika kompleksnih sistemov in procesov

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: DMG Mori Co., Ltd.