H. Tatlisu, M. Bastürk, H. Rauch, M. Trinker:
"Structural Investigation of SiCf/SiC Composites";
Materials and Structures,
Ceramic matrix composites (CMC), especially silicon carbide (SiC) fiber-reinforced silicon carbide (SiC) matrix composites (SiCf/SiC) developed for high temperature applications are currently under discussion as a first wall and structural material for future fusion power plants. Porosity and radiation-induced swelling in the CMC and their influence on the thermal conductivity are the major problems. In addition, they affect the onset of the radiation damage parameters in a high radiation environment. the objective of this paper is to analyze the structure of the SiCf/SiC composite and to understand the radiation effects induced by neutrons and protons in a SiCf/SiC composite. In order to investigate radiation-induced structural changes on a micro- and nanostructural scale, a SiCf/SiC composites has been exposed to high proton and neutron radiation in the SINQ spallation source. To analyze of the structural changes, e.g. pore sizes, a highly irradiated and a non-irradiated SiCf/SiC composites have been inspected by means of small angle neutron scattering at the Paul Scherrer Institute (PSI). Non-irradiated SiCf/SiC composites have been investigated with neutron radiography and scanning electron microscopy. These different methods for material investigations give an insight into the properties of this material in view of its applications in future fusionpower plant.
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