A Method to Determine the Electrical Resistance of a Metallic Powder Mass under Compression

In this paper, a phenomenological model to predict the value of the electrical resistance of a compressed metal powder mass is proposed. The model, based on the experimental compressibility and resistivity-porosity curves, is useful in the field of the electrical resistance consolidation. In this ar...

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Bibliographic Details
Published in:Metals (Basel ) 2017-11, Vol.7 (11), p.479
Main Authors: Montes, Juan, Cuevas, Francisco, Ternero, Fátima, Astacio, Raquel, Caballero, Eduardo, Cintas, Jesús
Format: Article
Language:English
Subjects:
Activation
Compressibility (powder)
Consolidation
Electrical resistance
electrical sintering
Mathematical models
Metal powders
modeling
Porosity
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Summary:In this paper, a phenomenological model to predict the value of the electrical resistance of a compressed metal powder mass is proposed. The model, based on the experimental compressibility and resistivity-porosity curves, is useful in the field of the electrical resistance consolidation. In this area is often required to find out whether a certain mass of powder inside a die of specified inner section, and subjected to a certain compression, reaches a sufficiently small resistance value so that it can be consolidated by electrical means. The model also predicts the electrical resistance value of the powder mass in case of powders with no oxide layers, or after removing them mechanically or electrically by a previous activation process. The model predictions have been successfully validated through direct measurements of electrical resistance in powder aggregates both in as-received state and after electrical activation.
ISSN:2075-4701
2075-4701
DOI:10.3390/met7110479