An investigation of the long-term aqueous corrosion behaviour of glass, crystalline ceramics, and glass-ceramic composite materials
Notice bibliographique
Résumé
Nuclear power is considered a clean alternative source of electricity compared to fossil fuels due to low CO2 emissions. The long-term and safe sequestration of high-level radioactive waste (long half-life minor actinides and fission products) remains a key problem for the sustainable development of the nuclear industry. Deep geological repositories are being considered internationally as a future plan for the permanent disposal of high-level radioactive waste (i.e., long half-life minor actinides (Cm, Am, Np, Th), and fission products). A common challenge associated with geological disposal is ground water corrosion and leaching of the radionuclides incorporated in a wasteform into the environment. Glass-ceramic composite materials are being considered as potential nuclear wasteform candidates due to having high waste loading and expected enhanced chemical durability compared to borosilicate glass on its own. However, the long-term aqueous corrosion resistance (i.e., over years) of these glass-ceramic composite materials and how the structure of these materials changes after being exposed to an aqueous environment are not fully understood. This thesis aims to investigate how the long-term aqueous corrosion behaviour of glass, ceramic, and glass-ceramic composite materials change depending on their structure and composition. The aqueous corrosion experiments were performed in triplicate on each glass, ceramic, and glass-ceramic composite material to understand the similarities and differences in the leaching mechanism of these materials over one year of exposure to deionized water. It was found that the structure and composition of wasteform materials (i.e., single phase material vs. multiphase composite material) affect the dissolution mechanisms of glass, ceramic, and glass-ceramic composite materials upon exposure to deionized water. A combination of surface and bulk techniques has been used in this work to provide detailed information on the corrosion that occurs at the surface or bulk regions of these materials after being exposed to deionized water. The results have demonstrated that the corrosion process only occurs at the surface of these materials, and that the long-range structure of these materials was unaffected. The comprehensive surface analyses of the glass and glass-ceramic composite materials have shown that the aqueous corrosion of these materials led to the formation of an amorphous surface layer during the early stages of exposure to deionized water, which could restrict the further release of ions into the deionized water. The aqueous durability of glass-ceramic composite materials was found to be comparable to that of borosilicate glass, indicating that these materials can be considered as potential alternative wasteforms vs. borosilicate glass for the safe and effective sequestration of nuclear waste.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».