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

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.
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https://hal.archives-ouvertes.fr/hal-01917193
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Submitted on : Friday, November 9, 2018 - 11:06:50 AM
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Marc Singlard, Nicolas Tessier-Doyen, Geoffroy Chevallier, Stéphane Oriol, Guiseppe Fiore, et al.. Spark plasma sintering and mechanical properties of compounds in TiB2-SiC pseudo-diagram. Ceramics International, Elsevier, 2018, 44 (18), pp.22357-22364. ⟨10.1016/j.ceramint.2018.08.362⟩. ⟨hal-01917193⟩

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