The role of nanocrystalline binder metallic coating into WC after additive manufacturing
authors Cavaleiro, AJ; Fernandes, CM; Farinha, AR; Gestel, CV; Jhabvala, J; Boillat, E; Senos, AMR; Vieira, MT
nationality International
journal APPLIED SURFACE SCIENCE
author keywords Selective laser sintering; Sputtering; Nanocrystallinity; WC; Martensitic stainless steel
keywords TUNGSTEN CARBIDE POWDERS; STAINLESS-STEEL; LASER; MICROSTRUCTURE; PARTICLES; COBALT; SLS
abstract Tungsten carbide with microsized particle powders are commonly used embedded in a tough binder metal. The application of these composites is not limited to cutting tools, WC based material has been increasingly used in gaskets and other mechanical parts with complex geometries. Consequently, additive manufacturing processes as Selective Laser Sintering (SLS) might be the solution to overcome some of the manufacturing problems. However, the use of SLS leads to resolve the problems resulting from difference of physical properties between tungsten carbide and the metallic binder, such as laser absorbance and thermal conductivity. In this work, an original approach of powder surface modification was considered to prepare WCmetal composite powders and overcome these constraints, consisting on the sputter-coating of the WC particle surfaces with a nanocrystalline thin film of metallic binder material (stainless steel). The coating improves the thermal behavior and rheology of the WC particles and, at the same time, ensures a binder homogenous distribution. The feasibility of the SLS technology as manufacturing process for WC powder sputter-coated with 13 wt% stainless steel AISI 304L was explored with different laser power and scanning speed parameters. The SLS layers were characterized regarding elemental distribution, phase composition and morphology, and the results are discussed emphasizing the role of the coating on the consolidation process. (C) 2017 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0169-4332
year published 2018
volume 427
beginning page 131
ending page 138
digital object identifier (doi) 10.1016/j.apsusc.2017.08.039
web of science category Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
subject category Chemistry; Materials Science; Physics
unique article identifier WOS:000415135500015
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  impact metrics
times cited (wos core): 0
journal impact factor (jcr 2016): 3.387
5 year journal impact factor (jcr 2016): 3.184
category normalized journal impact factor percentile (jcr 2016): 79.407
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