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Theses

Création et nucléation de bulles lors de la montée en température de verres recyclés mis en contact

Abstract : This thesis focuses on the bubbles population that appears between two glass pieces when heated at 1100 °C without any reactive raw materials. Understanding the mechanisms involved in the transition from dissolved gas to gas is still a fundamental issue of materials science. Industrially, bubbles are the major sources of defects in the final glass product and the amount of recycled glass introduced in glass furnaces will likely increase.We have studied the life of a bubble at different times, from its creation to its growth behavior, and to its rise in the molten glass. We show that homogeneous nucleation cannot exist in molten glass because chemical reactions are not able to generate the needed supersaturations by themselves. Thus, right after glass transition, glass flow is responsible for the entrapment of gas pockets, which then become natural precursors of bubbles.We model the supersaturation at the interface between two glasses, and we show its influence over the number of stable nuclei that can form bubbles.We also model the growth dynamic by using the same characterization of glasses' oxidation states than for nucleation. We experimentally show that bubbles located at the interface between a reduced glass and an oxidized glass grow faster than bubbles located in an oxidized glass only. The main effect of the interaction between the two glasses is to move the sulfur equilibrium towards the formation of gaseous SO2.Finally, using X-rays and an optical flow algorithm, we present a new experimental setup which measure velocity fields in an opaque medium to assess bubbles ability to promote glass mixing.
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Submitted on : Wednesday, April 18, 2018 - 1:01:19 AM
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  • HAL Id : tel-01646188, version 2

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Damien Boloré. Création et nucléation de bulles lors de la montée en température de verres recyclés mis en contact. Matériaux. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066267⟩. ⟨tel-01646188v2⟩

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