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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Florent Michel; Georges Calas; Laurent Cormier; Université Pierre et Marie Curie (Paris / 1971-2017). |
OCLC Number: | 883862846 |
Description: | 1 vol. (119 p.) : ill. en coul. ; 30 cm. |
Responsibility: | Florent Michel ; sous la direction de Georges Calas et de Laurent Cormier. |
Abstract:
The radiative properties of the liquids used to produce glass and glass fibers may represent economic and environmental interests. The objective of this thesis is to connect the optical absorption properties at high-temperature to the liquid/glass structure. We are dealing firstly with alkali boro-silicates, corresponding to glass fibers, to understand the role of boron at high temperatures. We then examine the role of iron in soda-lime/alumino-silicate matrices. Those matrices correspond to sheet glass and fiberglass, respectively. For the borosilicate liquid, the three-fold coordinated boron proportion increases by 40 \% when the temperature increases from 25 °C to 1200 °C. As the trigonal boron absorbs infrared at 10 µm, it improves the absorption of radiated energy by a heated building. A rapid quench of the liquid would maximize the insulation properties of the fiber. X-ray absorption spectroscopy shows that iron has low coordination number in the glass but also in the liquid. For UV/VIS/NIR spectroscopic properties with temperature, we see systematic evolution of the spectrum for the both compositions. For the soda-lime glass, strong changes of the UV/Vis/NIR spectrum can be observed with temperature. Up to 1400 °C, the transmittance of the glass batch is improved. The UV-VIS-NIR results obtained in situ at high temperature allow a better understanding of the radiative transfer in the batch within the furnace. We have evidenced a different behavior for the two matrices, which could allow a better control of the radiative transfer efficiency.
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