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Bornhöft, Hansjörg
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Publications (5/5 displayed)
- 2024Optical Real-Time Castability Evaluation for High-Throughput Glass Melting
- 2023Viscous Sintering of Acid Leached Glass Powderscitations
- 2023Viscous Sintering of Acid Leached Glass Powders
- 2020The Effect of Ti and Other Minor Elements on the Reactivity of Granulated Ground Blast Furnace Slag (GGBS) in Blended Cements
- 2020Effect of TiO2 and 11 minor elements on the reactivity of ground‐granulated blast‐furnace slag in blended cementscitations
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article
Viscous Sintering of Acid Leached Glass Powders
Abstract
The process of viscous flow sintering is a phenomenon that is closely linked to the surface properties of the glass particles. In this work, we studied the extreme case of acid-leaching of soda-lime-silicate glass beads of two different particle size distributions and its effects on non-isothermal viscous sintering of powder compacts. Depth profiling of the chemical composition after leaching revealed a near-surface layer depleted in alkali and alkaline earth ions, associated with concurrent hydration as mass loss was detected by thermogravimetry. Heating microscopy showed that acid treatment of glasses shifted the sinter curves to higher temperatures with increasing leaching time. Modelling of the shrinkage with the cluster model predicted a higher viscosity of the altered surface layer, while analysis of the time scales of mass transport of mobile species (Na+, Ca2+ and H2O) during isochronous sintering revealed that diffusion of Na+ can compensate for concentration gradients before sintering begins. Also, exchanged water species can diffuse out of the altered layer, but the depletion of Ca2+ in the altered surface layer persists during the sinter interval, resulting in a glass with higher viscosity, which causes sintering to slow down.