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Metals 2019, 9(2), 159; https://doi.org/10.3390/met9020159

Production of Ultrafine Grained Hardmetals by Electrical Resistance Sintering

1
Department of Materials Science and Engineering, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
2
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
3
Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Winterbergstrasse 28, 01277 Dresden, Germany
4
Tecnalia Research & Innovation, Mikeletegi Pasealekua 2, 20009 San Sebastián, Spain
*
Author to whom correspondence should be addressed.
Received: 22 December 2018 / Revised: 27 January 2019 / Accepted: 28 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
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Abstract

In this work, powders of cemented ultrafine WC-6 wt.% Co were consolidated. The feasibility of the medium frequency electrical resistance sintering (MF-ERS) technique were studied to prevent WC grain growth during consolidation. Porosity and hardness were measured at different zones of the MF-ERS compacts. The compacts showed a slight inhomogeneity in their properties across their section, but it was controlled by choosing suitable values of the processing parameters. The optimal values for the material studied were current intensities between 7 and 8 kA and sintering times between 600 and 800 ms. The main achievement using this consolidation method was that sintered compacts essentially maintained the initial WC grain size. This was attained to processing times of less than 2 s, and without the need for using protective atmospheres. View Full-Text
Keywords: electrical resistance sintering; hardmetal; ultrafine grain electrical resistance sintering; hardmetal; ultrafine grain
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Cintas, J.; Astacio, R.; Cuevas, F.G.; Montes, J.M.; Weissgaerber, T.; Lagos, M.Á.; Torres, Y.; Gallardo, J.M. Production of Ultrafine Grained Hardmetals by Electrical Resistance Sintering. Metals 2019, 9, 159.

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