Skip to Main content Skip to Navigation
Theses

Comportement thermique du xénon dans le nitrure de titane fritté matrice inerte d’intérêt des RNR-G

Abstract : This work concerns the generation IV future nuclear reactors such as gas-cooled fast reactor (GFR) for which refractory materials as titanium nitride (TiN) are needed to surround fuel and act as a fission product diffusion barrier. This study is about Xe thermal behavior in sintered titanium nitride. Microstructure effects on Xe behavior have been studied. In this purpose, several syntheses have been performed using differents sintering temperatures and initial powder compositions. Xenon species have been introduced into samples by ionic implantation. Then, samples were annealed in temperature range from 1300°C to 1600°C, these temperatures being the accidental awaited temperature. A transport of xenon towards sample surface has been observed. Transport rate seems to be slow down when increasing sintering temperature. The composition of initial powder and the crystallographic orientation of each considered grain also influence xenon thermal behavior. Xenon release has been correlated with material oxidation during annealing. Xenon bubbles were observed. Their size is proportional with xenon concentration and increases with annealing temperature. Several mechanisms which could explain Xe intragranular mobility in TiN are proposed. In addition with experiments, very low Xe solubility in TiN has been confirmed by ab initio calculations. So, bivacancies were found to be the most favoured Xe incorporation sites in this material.
Complete list of metadatas

Cited literature [65 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00543163
Contributor : Abes Star :  Contact
Submitted on : Friday, April 1, 2011 - 3:30:29 PM
Last modification on : Friday, October 23, 2020 - 4:54:30 PM

File

TH2010_Bes_RenA_.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00543163, version 2

Collections

Citation

René Bes. Comportement thermique du xénon dans le nitrure de titane fritté matrice inerte d’intérêt des RNR-G. Autre [cond-mat.other]. Université Claude Bernard - Lyon I, 2010. Français. ⟨NNT : 2010LYO10227⟩. ⟨tel-00543163v2⟩

Share

Metrics

Record views

1142

Files downloads

464