Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering

Fátima Ternero; Eduardo S. Caballero; Raquel Astacio; Jesús Cintas; Juan M. Montes

doi:10.3390/ma13092131

Materials (May 2020)

Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering

Fátima Ternero,
Eduardo S. Caballero,
Raquel Astacio,
Jesús Cintas,
Juan M. Montes

Affiliations

Fátima Ternero: Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain
Eduardo S. Caballero: Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain
Raquel Astacio: Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain
Jesús Cintas: Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain
Juan M. Montes: Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain

DOI: https://doi.org/10.3390/ma13092131
Journal volume & issue: Vol. 13, no. 9
p. 2131

Abstract

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A commercially pure (c.p.) nickel powder was consolidated by Medium-Frequency Electrical Resistance Sintering (MF-ERS). In this consolidation technique, a pressure and the heat released by a high-intensity and low-voltage electrical current are concurrently applied to a metal powder mass. A nickel powder with a high tap porosity (86%) and a low applied pressure (only 100 MPa) is chosen in order to be able to obtain compacts with different levels of porosity, to facilitate the study of the porosity influence on the compact properties. The influence of current intensity and heating time on the global porosity values, the porosity and microhardness distribution, and the electrical conductivity of the sintered compacts is studied. The properties of the compacts consolidated by MF-ERS are compared with the results obtained by the conventional powder metallurgy route, consisting of cold pressing and furnace sintering. A universal equation to describe the porosity influence on all the analyzed properties of powder aggregates and sintered compacts is proposed and validated.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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