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Synthèse de matériaux alvéolaires base carbures par transformation d'architectures carbonées ou céramiques par RCVD/CVD : application aux récepteurs solaires volumiques

Abstract : The aim is to design and create efficient cellular architectures for volumetric solar receivers used in the future thermodynamic power plants. Three strategies are considered for the creation of ceramic or carbon preforms: (i) the synthesis of biomorphic materials resulting from the cutting of balsa, (ii) the elaboration of ceramic structures by binder jetting and (iii) the replication of polymer structures made by 3D printing, using a carbon or ceramic precursor resin. In all cases, the green preforms are converted by pyrolysis to C or SiC and an infiltration step / SiC coating by CVD (Chemical Vapor Deposition) completes the manufacture of ceramic structures. An intermediate stage of RCVD (Reactive CVD) was implemented during the first strategy, in order to convert the microporous carbonaceous structure into TiC. The composition, the microstructure and the porous architecture of the ceramic structures were first characterized. The characteristics of the most relevant materials, considering the application as a solar receiver, were then examined. The thermomechanical properties and the oxidation resistance have thus been characterized in priority. Permeability and thermo-radiative properties, which are also two important factors for application, were also considered.
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https://tel.archives-ouvertes.fr/tel-01940535
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Submitted on : Friday, November 30, 2018 - 12:23:07 PM
Last modification on : Tuesday, May 26, 2020 - 3:11:51 AM
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Anthony Baux. Synthèse de matériaux alvéolaires base carbures par transformation d'architectures carbonées ou céramiques par RCVD/CVD : application aux récepteurs solaires volumiques. Matériaux. Université de Bordeaux, 2018. Français. ⟨NNT : 2018BORD0193⟩. ⟨tel-01940535⟩

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