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Powder Pre-Conditioning for the LS Process
It has previously been shown that the use of recycled Nylon-12 powder leads to
increased Elongation at Break (EaB) of Laser Sintered (LS) parts, possibly due to
elevated powder temperature in the part bed causing increases in molecular weight.
However, this increase in EaB often corresponds to a decrease in repeatability, likely
to be through variations in powder history.
The research presented here has shown that thermal pre-conditioning of virgin powder
can increase EaB of LS parts, with no significant loss of repeatability. Materials
analysis of the conditioned powder batches is also presented in order to quantify the
differences in powder properties and to help explain the mechanisms involved.Mechanical Engineerin