External coating for the protection of SiC/SiC composite claddings in PWR environment

1 year postdoctoral position starting from 02/09/2019

CEA Saclay

Personnes à contacter par le candidat

Alexandre MICHAU
alexandre.michau@cea.fr

DATE DE DÉBUT SOUHAITÉ

02/09/2019

DATE LIMITE DE CANDIDATURE

02/09/2019

RÉFÉRENCE DE L’ANNONCE

INSTN PsD-DEN-19-0092

TÉLÉCHARGEZ L’OFFRE

Accident tolerant fuels (ATF) fall into two categories depending on their technology readiness level. The first one regroups surface functionalized current claddings that are assumed to be fully mature earlier the second class constituted from alternative materials.
SiC/SiC matrix/fiber composites belong to the second group and are presently the reference solution studied by the international community. Despite its exceptional behaviour at high temperatures, it is now admitted that SiC releases silicon oxide under conditions representative from the primary coolant in pressurized water reactors, which is limiting their right operation. In order to avoid this hydrothermal corrosion phenomenon, a metallurgical protective thin film exhibiting a stable behaviour in these conditions will be deposited on SiC/SiC composites thanks to an ionized physical vapor deposition process. Two essential aspects of the coating will addressed by optimizing the deposition process. They will consist of the interface separating the composite substrate from its coating and the coating microstructure, so that the granted protection is maximized.

Profile required:
PhD degree in material science and thin films engineering
Recommended experience with PVD processes and/or composite materials and their characterization