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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v8.i3.60
pages 407-416

INVESTIGATION ON SUPERSONIC GAS FLOW COUPLED WITH AN INDUCTIVE LOW-PRESSURE PLASMA USED FOR THE SYNTHESIS OF SOFC MATERIAL

F. Rousseau
Laboratoire de Génie des Procédés Plasmas et Traitement de Surface − Université Pierre et Marie Curie − Paris 6 - ENSCP, 11, rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
M. Nikravech
Laboratoire de Genie des Precedes Plasmas et Traitement de Surfaces, Universite P. et M. Curie, Ecole Nationale Superieure de Chimie de Paris, 11 rue Pierre et Marie Curie 75005 Paris, France
E. Francke
Laboratoire de Génie Procédés Plasmas et Traitement de Surface, Université Pierre et Mane Curie- ENSCP 11-13, rue Pierre et Marie Curie 75231 Paris Cedex 05 France
J. Milpied
Laboratoire de Genie des Precedes Plasmas et Traitements de Surface, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
Daniel Morvan
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France
Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

RÉSUMÉ

A low-pressure plasma reactor equipped with a convergent nozzle is used to synthesize cathode materials for Solid Oxide Fuel Cell applications. Nitrated precursors dissolved in water are injected by a difference in pressure from each part of a pulsed valve. When the precursors go through the reactor, water vaporizes due to vacuum and plasma, nitrates are transformed into NOx, while La, Sr, and Mn ions are oxidized by the activated species of plasma and, finally, La1-xSrxMnO3 is deposited on a substrate. The nozzle causes a supersonic flow in the reactor leading to high particle velocities. We have modeled gases flow in the reactor with the FLUENT® code in order to quantify the velocity of gases. Laser Doppler Anemometry (LDA) and Laser Doppler Granulometry (LDG) measurements gave us the velocity, concentration and diameters of the injected particles. Infrared spectroscopy was used to quantify the conversion rate of precursors into La1-xSrxMnO3. These techniques have permitted to improve our knowledge on the behavior of sprayed particles in low pressure supersonic plasma reactor. This set-up has been developed to obtain a perovskite deposited with a controlled chemical composition.


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