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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...
Nanostructured coated powders for structural net shape components
Castanho, J. M.; Vieira, M. T.; Matos, M.; Trindade, B.The specific goal of the present study is to evaluate the surface performance of thin films based on sputtered stainless steel (304 AISI) deposited on dissimilar (Cu) and similar powder materials (316 AISI) with different size distributions and shapes. The covering efficiency, the surface morphology and the grain size, and their impact on the flowability of powders, are studied. The most important role of powde...
Effect of ductile layers in mechanical behaviour of TiAlN thin coatings
Castanho, J. M.; Vieira, M. T.TiAlN is a very popular coating for high-speed cutting manufacturing processes. Nevertheless, it is important to develop research work concerning the durability of this kind of coatings. Design and producing coatings based on TiAlN with interlayers of metal with low elastic modulus, like Al, Ti or Cu may contribute to improvement of cutting efficiency. Interlayers with 80 nm of thickness, in alternateness with ...
The influence of nitrogen on the mechanical behaviour of multilayered coatings
Vieira, M. T.; Pereira, C. M.; Castanho, J. M.Multilayered films are a new kind of coating that belong to a more plentiful family of materials labelled as nanostructured materials. These kinds of coatings stand in the frontier of investigation in thin films for structural applications. In the present work, multilayered coatings with alternated layers of W---Ti---(N) and Ag were deposited to be used as wear resistant surfaces. The association of the high ha...
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