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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2004, Volume8

158 pages

DOI: 10.1615/HighTempMatProc.v8.i3

Issue price - $144.00

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 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

Jacques Amouroux
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

ABSTRACT

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 NO_x, while La, Sr, and Mn ions are oxidized by the activated species of plasma and, finally, La_1-xSr_xMnO₃ 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 La_1-xSr_xMnO₃. 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.