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Spark plasma sintering of ductile ceramic particles: study of LiF

Marder, Rachel and Estournès, Claude and Chevallier, Geoffroy and Kalabukhov, Sergey and Chaim, Rachman Spark plasma sintering of ductile ceramic particles: study of LiF. (2014) Journal of Materials Science, vol. 49 (n° 15). pp. 5237-5245. ISSN 0022-2461

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Official URL: http://dx.doi.org/10.1007/s10853-013-7786-7

Abstract

Densification of cuboidal micrometer-sized lithium fluoride particles as ductile ceramic by spark plasma sintering (SPS) was investigated. Specimens were fabricated at different pressures and temperature conditions, ranging from 2 to 100 MPa at 500 °C and from 200 to 700 °C under 100 MPa of applied pressure, respectively. Dense specimens of 99 % relative density were fabricated by heating to 500 °C under constant pressure of 100 MPa. The densification showed first compaction by particle rearrangement, followed by plastic deformation via dislocation glide. Hot-pressing models were used to describe the densification by considering the temperature dependences of the yield stress, the strain hardening behavior and coefficients, and the pore size and shape dependences on the applied stress. A good agreement was found between the experimental and the theoretical densification curves. At low pressure of 2 MPa, the densification occurs by particle sliding, assisted by viscous flow at their surfaces, and local plastic deformation at the particle contacts, due to the intensified local stress. Finally, the micrometer-sized structural features and the contiguity achieved by plastic deformation at the start of spark plasma sintering (SPS) nullify any field effects in this model system at higher pressures; good agreement was obtained with expected conventional hot pressing.

Item Type:Article
Additional Information:Thanks to Springer Verlag. The definitive version is available at http://link.springer.com/article/10.1007%2Fs10853-013-7786-7
HAL Id:hal-01132415
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Technion – Israel Institute of Technology (ISRAEL)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Ben-Gurion University of the Negev - BGU (ISRAEL)
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Deposited By: cirimat webmestre
Deposited On:17 Mar 2015 10:23

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