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Adaptation d'un réacteur plasma basse pression de dépôt pour la synthèse d'oxydes soumis à de hautes températures. Application aux piles à combustible type SOFC et aux barrières thermiques.

Samer Awamat
Abstract : The objective of this study is the development of processes for the creation of oxide films to be used in devices which are designed to function at high temperature. Such synthetic oxides are well-suited toward applications in solid oxide fuel cells and thermal barriers. Non-equilibrium plasma generated in a reactor with a supersonic convergent nozzle was used for the deposition of the oxide films. A nitrated chemical precursor was introduced to the plasma reactor in aerosol form via an adapted injector system. This new aerosol injection system coupled with the plasma enabled the development of oxide layer types which are reputed to be technically difficult to obtain. Study of the fluid dynamics of the gas-particle system was done in two ways. First, a numerical simulation developed using the software FLUENT indicated that the velocity of the plasma exiting a convergent nozzle in the system may be as much as 700m/s. Second, laser-Doppler anemometry experiments showed the importance of the role of the convergent nozzle for gas/particle acceleration. Emission spectroscopic measurements showed the important effect of the convergent nozzle on the concentration of reactive species in the plasma and its contribution to the dissociation of water observed by the presence of OH radical and H bands. Software was developed permitting the study of the evolution of the molar fraction of reactive species along the reactor as a function of the plasma power and the diameter of the convergent nozzle. Scanning electron microscopy was used to study the morphology of the synthetic oxide deposits. Fourier transform infrared spectroscopy was used to quantify the influence of different parameters on the conversion yield. X-ray diffraction spectroscopy was used to measure the purity of the deposits and their corresponding crystal structures.
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https://pastel.archives-ouvertes.fr/pastel-00005254
Contributor : Ecole Chimie Paristech <>
Submitted on : Friday, July 10, 2009 - 8:00:00 AM
Last modification on : Friday, July 10, 2009 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 9:13:32 PM

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  • HAL Id : pastel-00005254, version 1

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Samer Awamat. Adaptation d'un réacteur plasma basse pression de dépôt pour la synthèse d'oxydes soumis à de hautes températures. Application aux piles à combustible type SOFC et aux barrières thermiques.. Chemical Sciences. Chimie ParisTech, 2008. English. ⟨pastel-00005254⟩

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