TY - GEN
T1 - Effect of gas flow rates on powder stream characteristics and efficiency from coaxial nozzles
AU - Mouchard, Adrien
AU - Pomeroy, Michael
AU - Robinson, Jeremy
AU - McAuliffe, Bryan
AU - Donovan, Simon
AU - Tanner, David
N1 - Publisher Copyright:
© European Powder Metallurgy Association (EPMA)
PY - 2021
Y1 - 2021
N2 - For a given coaxial nozzle used in Directed-Energy Deposition, the carrier gas and shielding gas flow rates (CG and SG) were varied by ±40% around the nominal setting selected by the nozzle end-user. The different configurations were evaluated using a novel empirical method to reverse engineer the powder stream distribution from erosion profiles. The analysis gives the powder main trajectory, the powder dispersion evolution and the relative repartition of the powder around the nozzle (so called weighting). Eventually, the model enables assessment of the theoretical nozzle efficiency (ηp0) at the working distances considered. The results show that an increase of the SG moves the focus plane position away from the nozzle, while an increase in the CG brings it nearer, which greatly affect ηp0. Both the weighting and the dispersion were found highly dependent on the CG level, with minor repercussions on the process efficiency.
AB - For a given coaxial nozzle used in Directed-Energy Deposition, the carrier gas and shielding gas flow rates (CG and SG) were varied by ±40% around the nominal setting selected by the nozzle end-user. The different configurations were evaluated using a novel empirical method to reverse engineer the powder stream distribution from erosion profiles. The analysis gives the powder main trajectory, the powder dispersion evolution and the relative repartition of the powder around the nozzle (so called weighting). Eventually, the model enables assessment of the theoretical nozzle efficiency (ηp0) at the working distances considered. The results show that an increase of the SG moves the focus plane position away from the nozzle, while an increase in the CG brings it nearer, which greatly affect ηp0. Both the weighting and the dispersion were found highly dependent on the CG level, with minor repercussions on the process efficiency.
UR - http://www.scopus.com/inward/record.url?scp=85149181413&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85149181413
T3 - Euro PM2021 Congress Proceedings
BT - Euro PM2021 Congress Proceedings
PB - European Powder Metallurgy Association (EPMA)
T2 - 2021 European Powder Metallurgy Congress and Exhibition, Euro PM 2021
Y2 - 18 October 2021 through 22 October 2021
ER -