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

Impact factor: 0.058

ISSN Print: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v1.i4.110
pages 535-547

SYNTHESIS OF ULTRAFINE PARTICLES OF MATERIALS IN EROSIVE LASER PLASMA IN A HIGH-PRESSURE GAS ATMOSPHERE

A.G. Gnedovets
Baikov Institute of Metallurgy - Russian Academy of Sciences Leninsky pr., 49 - 117911 Moscow - Russia
E.B. Kul'batskii
Baikov Institute of Metallurgy - Russian Academy of Sciences Leninsky pr., 49 - 117911 Moscow - Russia
I. Yu. Smurov
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex; Ecole Nationale d'Ingenieurs de Saint-Etienne, 58 rue Jean Parot, 42023 Saint -Etienne Cedex 2, France
Gilles Flamant
Laboratoire des Procedes, Materiaux et Energie Solaire, PROMES-CNRS UPR 8521, 7 rue du Four solaire, 66120 Font Romeu-Odeillo, France
A. Figueras
Institut de Ciencia de Materials de Barselona - CSIC Campus VAB - E 08193 Bellaterra - Spain

ABSTRACT

Synthesis of ultrafine particles as a result of condensation in an erosive jet at laser vaporization of materials (metals, metal oxides, carbon) in gases (hydrogen, oxygen, helium, argon, xenon and air) at high pressures is investigated. The granulometric, phase, and chemical composition of the condensate particles is analyzed in relation to the elaboration conditions. It is found that the mean dimensions of the condensate particles increase with an increase of the ambient gas pressure. A particle nucleation and growth theory is used to describe the formation of the dispersed condensate in the erosive plasma. It is shown that the resulting particle size distribution is determined by the dependence of the cooling rate of the vapor-gas mixture on the pressure of the surrounding gas.