Densification and coarsening of laser sintered green parts by microwave technique

TL;DRAbstract

SLS is well recognized as one of the most diffused techniques for layer-by-layer construction, thanks to the wide variety of available materials. In particular, the processes using metal powders are largely applied for Rapid Tooling [Gatto A. & Iuliano L., 2000, Gatto A. & Iuliano L. 2001, Gatto A. & Iuliano L., 1998, Iuliano L. et al. 2003, Khaing M.W. et al. 2001, Abe F. et al. 2001]. Different versions of the process can be distinguished [Kathuria Y.P., 1999, Morgan R.H. et al. 2002]:• Solid state SLS, or Indirect Metal Sintering, using metal powders mixed with a polymeric binder. After laser forming the part is furnace treated and infiltrated, to obtain a higher density. In the early versions of the SLS process, two subsequent furnace cycles of 24 hours each were needed. During the first step the green parts are placed in a furnace where the polymer binder is removed and the steel particles are partially sintered. The resulting “brown” part is approximately 60 percent dense. Then t

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