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Warum ist Sprühkompaktieren ein Schnell‐Erstarrungsprozess?
Author(s) -
Henein H.
Publication year - 2010
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201000642
Subject(s) - spray forming , spray nozzle , fineness , materials science , metallurgy , supercooling , deposition (geology) , thermal spraying , forming processes , spray drying , alloy , composite material , mechanical engineering , chemical engineering , thermodynamics , engineering , geology , physics , paleontology , sediment , nozzle , coating
Since the invention of spray forming by Prof. Singer in the early 80's, many researchers have attempted to explain the rapid solidification features of the spray deposit through mathematical modelling of the process. The break‐up of the stream into atomized drops followed by the deposition of these semi‐solid droplets into a rotating deposit have been simulated using both the energy and the momentum equations. These models, however, do not explain the fineness of structure observed in spray formed products when compared to cast structures of similar dimensions and experiencing similar cooling rates. A single fluid technique provides an ideal tool to study the effect of atomization variables on the structure evolution of a spray formed deposit. It will be shown based on Cu‐6Sn, Al‐Cu and Al‐Fe alloys that the undercooling of second and subsequent phases in the deposit accounts for the rapid solidified structure in spray forming.