Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1613201 | Journal of Alloys and Compounds | 2013 | 6 Pages |
Abstract
A Cu65Ni20Fe15 powder was prepared by mechanical alloying at semi-pilot scale to form a face-centered-cubic (fcc) phase (γ-phase). This powder was then consolidated by spark plasma sintering (SPS) to form a pellet. The crystallographic structure of the material is not affected by the consolidation process, although there is a slight increase of the crystallite size from 20 to 32 nm, and a slight decrease of the lattice strain from 0.5% to 0.2%. The relative density of the SPS consolidated sample is 95%. Thermogravimetric analysis confirms the good oxidation resistance of the SPS sample with a mass gain of only 0.4% after 20 h of oxidation at 700 °C, which is attributed to the rapid formation of a protective NiFe2O4 layer. The SPS sample was then evaluated as inert anode for Al electrolysis in low-temperature (700 °C) KF-AlF3 electrolyte. After 20 h of electrolysis at an anode current density of 0.5 A cmâ2, the cell voltage reaches an unstable value of 5.0 V. The purity of the produced aluminum is 99.4% and the wear rate of the electrode is estimated at 1.8 cm yearâ1.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Gregory Goupil, Guillaume Bonnefont, Hassane Idrissi, Daniel Guay, Lionel Roué,