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Open AccessArticle

Medium-Frequency Electrical Resistance Sintering of Oxidized C.P. Iron Powder

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Metallurgy and Materials Engineering Group Escuela Técnica Superior de Ingeniería, Universidad de Sevilla Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
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Department of Chemical Engineering, Physical Chemistry and Materials Science Escuela Técnica Superior de Ingeniería, Universidad de Huelva Campus El Carmen, Avda. Tres de Marzo s/n, 21071 Huelva, Spain
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Author to whom correspondence should be addressed.
Metals 2018, 8(6), 426; https://doi.org/10.3390/met8060426
Received: 10 May 2018 / Revised: 24 May 2018 / Accepted: 4 June 2018 / Published: 6 June 2018
Commercially pure (C.P.) iron powders with a deliberate high degree of oxidation were consolidated by medium-frequency electrical resistance sintering (MF-ERS). This is a consolidation technique where pressure, and heat coming from a low-voltage and high-intensity electrical current, are simultaneously applied to a powder mass. In this work, the achieved densification rate is interpreted according to a qualitative microscopic model, based on the compacts global porosity and electrical resistance evolution. The effect of current intensity and sintering time on compacts was studied on the basis of micrographs revealing the porosity distribution inside the sintered compact. The microstructural characteristics of compacts consolidated by the traditional cold-press and furnace-sinter powder metallurgy route are compared with results of MF-ERS consolidation. The goodness of MF-ERS versus the problems of conventional sintering when working with oxidized powders is analyzed. The electrical consolidation can obtain higher densifications than the traditional route under non-reducing atmospheres. View Full-Text
Keywords: electrical resistance sintering; MF-ERS; FAST; ECAS; iron; hot pressing; sintering; powder metallurgy electrical resistance sintering; MF-ERS; FAST; ECAS; iron; hot pressing; sintering; powder metallurgy
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Montes, J.M.; Cuevas, F.G.; Ternero, F.; Astacio, R.; Caballero, E.S.; Cintas, J. Medium-Frequency Electrical Resistance Sintering of Oxidized C.P. Iron Powder. Metals 2018, 8, 426.

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