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A Phenomenological Analysis of Sintering Mechanisms of W-Cu from the Effect of Copper Content on Densification Kinetics

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Abstract

The effect of addition of copper on the sintering of a W powder was systematically investigated by the analysis of dilatometric experiments on W and W-Cu compacts prepared with submicrometric powders. A pure W powder compact and a W-10 wt pct Cu powder compact with the same packing fraction of W particles were first studied, in order to analyze the effect of copper at fixed microstructure of the solid W particle packing. A more systematic set of experiments with different copper contents and W particle sizes was also qualitatively analyzed. A phenomenological model of sintering was developed and fitted in order to extrapolate the effect of copper content on sintering kinetics at fixed microstructure of the W particle skeleton. An interpretation of the sintering mechanisms was then proposed. Sintering of a W-Cu powder compact is the result of solid-state sintering of the W skeleton, enhanced by the capillary forces exerted by copper, with the superimposition of a particle rearrangement step after copper melting.

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Acknowledgments

This work was carried out with the support of the European Fusion Development Agreement (EFDA) and the European Union under the Association EURATOM/CEA entity. The authors also thank the Eurotungstene Metal Powders–French Company for material supply and technical support.

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Author notes

  1. J.-J. Raharijaona (formerly Postdoctoral Student, Engineer)

    Present address: ITER Organization, St. Paul-lez-Durance, France

Authors and Affiliations

  1. Laboratoire de Science et Ingénierie des Matériaux et Procédés, SIMAP, Grenoble INP/UJF/CNRS, Domaine Universitaire, BP 75, F-38402, Saint-Martin d’Hères, France

    J.-J. Raharijaona (formerly Postdoctoral Student, Engineer), J.-M. Missiaen (Associate Professor) & D. Bouvard (Professor)

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  1. J.-J. Raharijaona
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  2. J.-M. Missiaen
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  3. D. Bouvard
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Correspondence to J.-M. Missiaen.

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Manuscript submitted September 11, 2010.

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Raharijaona, JJ., Missiaen, JM. & Bouvard, D. A Phenomenological Analysis of Sintering Mechanisms of W-Cu from the Effect of Copper Content on Densification Kinetics. Metall Mater Trans A 42, 2411–2419 (2011). https://doi.org/10.1007/s11661-011-0615-1

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