Crystallization of nuclear glass under a thermal gradient applied to the self-crucible produced in the skull melting process
type: Dataset
description: In the context of the vitrification of high level nuclear waste, a new industrial process has been launched in 2010 at the La Hague factory: The skull melting process. This setup applies thermal gradients to the melt, which leads to the formation of a solid layer of glass: the “self-crucible”. The question would be to know whether these thermal gradients have an impact or not on the crystallization behaviour of the considered glasses in the self crucible. In order to answer that question, the crystallization of two glass compositions of nuclear interest has been investigated with an image analysis based method in isothermal and thermal gradient heat treatments conditions. The isothermals experiments allow for the quantification (growth speed, nucleation, crystallized fraction) of the crystallization of apatites (660°C-900°C) and powellites (630°C- 900°C). The comparison of the results obtained through these two types of experimentations allows us to conclude that there is no impact of the thermal gradient on the crystallization of the studied glass compositions. In order to complete the image analysis study (based on surfaces), in and ex situ microtomography experiments have been performed at ESRF (Grenoble) on the ID10 beamline. This study allowed us to follow the crystallization of apatites in a simplified glass and to confirm the reliability of the image analysis method based on the analysis of surfaces.
landing page: https://theses.hal.science/tel-00954542
identifier: NNT: 2013ORLE2035
keyword: analyse-dimages
keyword: creuset-froid
keyword: cristallisation
keyword: crystallization
keyword: gradient-thermique
keyword: image-analysis
keyword: infoeu-reposemanticsdoctoralthesis
keyword: microtomographie
keyword: microtomography
keyword: nuclear-waste-glass
keyword: skull-melting-process
keyword: spiotherengineering-sciences-physicsother
keyword: thermal-gradient
keyword: theses
keyword: verre-nucleaire
issued: 2026-05-06T04:12:44.931228
modified: 2026-05-06T04:12:44.931233
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Crystallization of nuclear glass under a thermal gradient applied to the self-crucible produced in the skull melting process
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00954542
issued: 2026-05-06T04:12:44.936941
modified: 2026-05-06T04:12:44.909867