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Meeting MS&T22: Materials Science & Technology
Symposium Progressive Solutions to Improve Corrosion Resistance of Nuclear Waste Storage Materials
Presentation Title Microstructural Development and Chemical Durability of a Borosilicate Glass-ceramic Waste-form
Author(s) Richard Brow, Nicholas Roberts, Paul Porter, Jarrod Crum
On-Site Speaker (Planned) Richard Brow
Abstract Scope A borosilicate glass-ceramic waste-form has been developed to immobilize MoO3-rich waste streams by incorporating soluble alkaline earth molybdates in a chemically durable glass-ceramic that includes chemically stable crystalline rare earth silicates (oxyapatite) [1]. In this paper, we describe the microstructural evolution of these materials from a) melts that were dynamically quenched at rates from >300°C/sec to CCC-conditions (~0.01°C/sec); and b) melts that were quenched, then held under isothermal conditions. Quantitative phase information obtained by analytical electron microscopy, X-ray diffraction, and Raman spectroscopy is used to construct Time-Temperature-Transformation diagrams that summarize the effects of thermal histories on the development of the powellite and oxyapatite phases and the nature of the residual glass phase. This information then is used to explain the effects of microstructure on the relative release rates of ions from the heat-treated glasses. [1] JV Crum, et al., J. Nucl. Mater., 482 1 (2016).

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Designing Glasses for Nuclear Waste Immobilization with AI and ML
Diminished Diffusion in the Aged Hydrated Gels of Irradiated Borosilicate Glasses
Environmental Cracking Lifetime Prediction through the Development of Pitting and SCC Models for Nuclear Waste Storage Casks
From Preferential Bonding to Phase Separation in Boro-silicate Glasses
Microstructural Development and Chemical Durability of a Borosilicate Glass-ceramic Waste-form
Predicting the Long-term Durability of Nuclear Waste Immobilization Glasses using Machine Learning
SCC of Nuclear Waste Canisters: Mechanisms and Mitigation

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