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Synthèse frittage et étude du comportement mécanique endommageable de phases MAX - Ablation vers la formation de phases MXenes

Abstract : MAX phases are transition metal carbides or nitrides, with a characteristic layered microstructure. These original materials combine properties typical of ceramics, such as a high rigidity and a refractoriness, with particularities found usually in metals, alike a good thermal and electrical conductivity as well as the possibility to be easily machined. Some phases, containing aluminium, show oxidation resistance, with the formation of a dense and adherent layer of Al2O3 on their surface. These properties give them high potential for applications in demanding environments, particularly in the transport sector. In this work, Ti2AlC, Zr2AlC and Hf2AlC phases were selected and synthesized by arc melting, pressureless sintering and Spark Plasma Sintering (SPS) from a powder mixture. The use of liquid preceramic precursors, which yield the ceramic after thermal treatment, was also examined. MAX phases can also be chemically etched with fluorinated compounds, to remove the aluminium and form MXene phases. The operating procedure, leading to the Ti2C phase, from a hydrofluoric acid (HF) solution and a HCl/LiF mixture, was adjusted. Finally, the unusual mechanical properties of MAX phases (Ti2AlC and Ti3AlC2) were observed. They are capable of dissipating energy by damaging their microstructure under mechanical stress, resulting in a non-linear behaviour. The influence of MAX phase proportion as well as porosity presence was studied.
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Submitted on : Monday, May 16, 2022 - 12:16:14 PM
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Elise Hugon. Synthèse frittage et étude du comportement mécanique endommageable de phases MAX - Ablation vers la formation de phases MXenes. Matériaux. Université de Limoges, 2022. Français. ⟨NNT : 2022LIMO0040⟩. ⟨tel-03669057⟩

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