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Spark plasma sintering and mechanical properties of compounds in TiB2-SiC pseudo-diagram

Singlard, Marc and Tessier-Doyen, Nicolas and Chevallier, Geoffroy and Oriol, Stéphane and Fiore, Guiseppe and Vieille, Bruno and Estournès, Claude and Vardelle, Michel and Rossignol, Sylvie Spark plasma sintering and mechanical properties of compounds in TiB2-SiC pseudo-diagram. (2018) Ceramics International, 44 (18). 22357-22364. ISSN 0272-8842

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Official URL: https://doi.org/10.1016/j.ceramint.2018.08.362

Abstract

The influence of spark plasma sintering (SPS) parameters (temperature, time, pressure) and the role of particle size on densification, microstructure and mechanical properties of commercial additive-free TiB2, SiC and composites thereof were studied by X-ray diffraction, scanning electron microscopy, the ultrasonic method and indentation. Three particle sizes of SiC and 2 of TiB2 were processed. An optimal cycle was found for TiB2 and SiC: 2000 °C, 3 min dwell time, and 100 MPa applied at 600 °C. The relative density of pure SiC increases linearly from 70% to 90% when the initial particle size decreases from 1.75 μm to 0.5 μm. Pure TiB2 was densified up to 87%. Using 2.5 wt% SiC in TiB2, the relative density increases to 97%. Young's modulus and the hardness of all samples were measured, with results discussed. The higher properties were obtained for additive-free TiB2–5% SiC with a relative density of 97% and with the Young's modulus and Vickers hardness values being close to 378 GPa and 23 GPa, respectively.

Item Type:Article
HAL Id:hal-01917193
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université de Limoges - UNILIM (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:09 Nov 2018 10:06

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