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Surface modification of stainless steel powders for microfabrication
Vieira, M. T.; Martins, A. G.; Barreiros, F. M.; Matos, M.; Castanho, J. M.The current trend towards miniaturization has led to the increasing use of stainless steel powders as raw material in the manufacture small parts with complex shapes, e.g. medical devices. This paper focuses on the role of coated and uncoated low carbon stainless steel powders, having d50 = 7.3 [mu]m, normal particle size distribution and a shape factor of 1 on additive processes used in micromanufacturing, e.g...
Structural phase evolution with temperature of non-conventional particles in PIM
Barreiros, F. M.; Vieira, M. T.Some inorganic natural powders may be interesting to manufacture complex shapes by powder injection moulding (PIM). However, these powders may evolve chemical and physically with temperature during the manufacturing processes, inducing blusters and geometrical irregularities, particularly loss of circularity. These imperfections were associated to gas liberation and dimensional variations during the debinding a...
Recovering inorganic wastes
Vieira, M. T.; Barreiros, F. M.; Catarino, L.The aim of this work is to recover wastes by uniaxial pressing and injection moulding. A previous morphological, chemical and mineralogical identifications of different waste disposal batches guaranteed its reproducibility and revealed that in some cases they should be suitable to be treated by those conformation processes. Different tests regarding the chemical and structural evolution with temperature were pe...
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