# Characterization of the ion-amorphization process and thermal annealing effects on third generation SiC fibers and 6H-SiC

* Corresponding author
3 L2ME - Etude de la Matière en Mode Environnemental
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : The objective of the present work is to study the irradiation effects on third generation SiC fibers which fulfill the minimum requisites for nuclear applications, i.e. Hi-Nicalon type S, hereafter HNS, and Tyranno SA3, hereafter TSA3. With this purpose, these fibers have been ion-irradiated with 4 MeV Au ions at room temperature and increasing fluences. Irradiation effects have been characterized in terms of micro-Raman Spectroscopy and Transmission Electron Microscopy and compared to the response of the as-irradiated model material, i.e. 6H-SiC single crystals. It is reported that ion-irradiation induces amorphization in SiC fibers. Ion-amorphization kinetics between these fibers and 6H-SiC single crystals are similar despite their different microstructures and polytypes with a critical amorphization dose of $\sim$3 × 10$^{14}$ cm$^{−2}$ ($\sim$0.6 dpa) at room temperature. Also, thermally annealing-induced cracking is studied via in situ Environmental Scanning Electron Microscopy. The temperatures at which the first cracks appear as well as the crack density growth rate increase with increasing heating rates. The activation energy of the cracking process yields 1.05 eV in agreement with recrystallization activation energies of ion-amorphized samples.
Document type :
Journal articles

Cited literature [43 references]

https://hal-cea.archives-ouvertes.fr/cea-01370179
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Submitted on : Monday, April 29, 2019 - 1:15:12 PM
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### Citation

Juan Huguet-Garcia, Aurélien Jankowiak, Sandrine Miro, Renaud Podor, Estelle Meslin, et al.. Characterization of the ion-amorphization process and thermal annealing effects on third generation SiC fibers and 6H-SiC. EPJ N - Nuclear Sciences & Technologies, EDP Sciences, 2015, 1, pp.8. ⟨10.1051/epjn/e2015-50042-9⟩. ⟨cea-01370179⟩

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