Oxidation protection of carbon/carbon composites and non- destructive characterization methodology development

Abstract : Carbon fiber reinforced carbon composites (C/C) possess many unique properties, such as low-density (< 2.0 g/cm3), high specific strength/modulus, low coefficient of thermal expansion and excellent thermal shock resistance. They have been used as the structural materials in vehicle heat shields and aircraft brakes. However, carbon is sensitive to oxidation at high temperature. The main idea of this thesis is to develop oxidation/ablation protection technology for C/C, where coating technology and matrix modification were proposed. To improve the adhesive strength and relieve the thermal expansion mismatch between the coating and the substrate, blasting treatment was proposed to design an interlock coating/substrate interface. Additionally, to better evaluate the service reliability of the coating, Kossel interferences of proton-induced X-ray emissions combined with X-ray reflectivity, as a novel non-destructive characterization method, were developed. The feasibility of this method was confirmed in planar waveguides films. This methodology is promising for us to evaluate the service reliability of HfC/SiC/HfC multilayer for C/C in actual application. For the matrix modification technology, HfB2 and HfB2-SiC ceramics were introduced into C/C substrate. Combined with thermogravimetric analysis and oxidation/ablation performance measurement, the role of HfB2 and HfB2-SiC ceramics were discussed.
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Jiaping Zhang. Oxidation protection of carbon/carbon composites and non- destructive characterization methodology development. Material chemistry. Sorbonne Université, 2019. English. ⟨tel-02176911⟩

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