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One-step synthesis of few-layered-graphene/alumina powders for strong and tough composites with high electrical conductivity

Abstract : The chemical vapor deposition of carbon onto a commercial α-Al2O3 powder bed produces a pristine film of few-layered-graphene (FLG) uniformly covering the α-Al2O3 grains. This obviates both the manipulation of nanocarbons, lengthy mixing steps and the risk of damaging any pre-existing graphene platelets. The powders are consolidated to 99 % by SPS, producing samples where a FLG film is located along the grain boundaries of the submicron α-Al2O3. Compared to the pure α-Al2O3, the composites are moderately stronger and similarly tough and hard due to crack-deflection and crack-bridging and they are electrically conducting with a percolation threshold below 0.74 vol.% of carbon. The high conductivity values reflect the high quality of the thin FLG film and its continuous nature over very long distances. The samples are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy.
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https://hal.archives-ouvertes.fr/hal-03031659
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, November 30, 2020 - 3:30:51 PM
Last modification on : Wednesday, December 2, 2020 - 3:28:48 AM
Long-term archiving on: : Monday, March 1, 2021 - 7:31:56 PM

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Alicia Weibel, Andréas Flaureau, Adeline Pham, Geoffroy Chevallier, Jérôme Esvan, et al.. One-step synthesis of few-layered-graphene/alumina powders for strong and tough composites with high electrical conductivity. Journal of the European Ceramic Society, Elsevier, 2020, 40 (15), pp.5779-5789. ⟨10.1016/j.jeurceramsoc.2020.06.029⟩. ⟨hal-03031659⟩

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