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Preparation and electrical properties of dense micro-cermets made of nickel ferrite and metallic copper |
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| Authors: | Valérie Baco-Carles Isabelle Pasquet Véronique Laurent Armand Gabriel Philippe Tailhades |
| Affiliation: | 1. Institut Carnot CIRIMAT, Université de Toulouse, CNRS, Université Paul Sabatier, 118 Route de Narbonne, 31 062 Toulouse Cedex 9, France;2. Rio Tinto Alcan, Centre de Recherche de Voreppe, ZI Centr''Alp, 725 Rue Aristide Berges, 38341 Voreppe Cedex, France |
| Abstract: | Dense micro-cermets made of nickel ferrites and copper micrometric particles were obtained from partial reduction under hydrogenated atmosphere at 350 °C of mixed copper nickel ferrites, and sintering in nitrogen at 980 °C. The small copper particles are homogeneous in size and well dispersed in the spinel oxide matrix. No exudation of copper metal was observed after sintering. The micro-cermets prepared are semi-conducting materials with electrical conductivity lying from 44 to 130 S/cm at 980 °C. Their overall characteristics make them interesting for inert anodes dedicated to aluminium electrolysis in melted cryolite. |
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