Jonathan RAYNAUD, Maxime LHUISSIER, Magali ROLLIN

DOI Number: 10.60853/g0ty-c824

Conference number: HiSST-2024-0064

Ceramic matrix composites (CMCs) are used in high temperature applications, for example for aircraft brakes or rocket nozzles. In recent years, this kind of materials is of more and more interest for the development of missile parts subjected to temperatures above 400 °C. To guarantee their performances, some CMCs require to be protected by an environmental barrier coating (EBC). Despite their low thickness which do not exceed a few hundred microns, an EBC has to avoid air penetration in the CMC structure. So, it has to contain a minimum amount of microcracks and pores. Firstly, this needs an adapted elaboration process, robust whatever the dimensions and the shape of the parts. Secondly, this needs control methods able to visualize the microstructure non-destructively with a sufficient resolution. EBCs have been elaborated at the surface of a C/C plate by several technics using the same principle: application of a slurry, drying and heating. These technics are Liquid Silicium Infiltration (LSI) and Polymer Derived Ceramic (PDC). Some process parameters have been studied to know their influence on the EBC microstructure: CMC surface roughness, slurry coating thickness, heat treatment. The obtained samples have been observed by microscopy and by microtomography. In parallel, several NDI technics have been tested on the elaborated samples in order to find industrial adapted ones.

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In Categories: 1.Events, HiSST 2024, Materials and Structures
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