Abstract
A novel PSD (particle size distribution) model to calculate the powder yields of plasma rotating electrode process (PREP) of nickel base superalloys powders was studied. The results showed that the meshing data of the nickel base superalloys powders like EP741NP and Inconel718 produced by PREP fitted the calculation of the novel PSD model well. The results also showed that not only rotating speed but also melting rate had significant influence on the fine powder yield in the centrifugal atomization system. The general PREP nickel base alloy powders showed characteristics of a bimodal Rosin-Rammler distribution mixed by the ligament disintegrating and direct drop formation. The fractions of the both mechanisms and the process factors of spraying were discussed. This fitting can help the engineers make the target powder yield increase by adjusting the process parameters.
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