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Progress in Plasma Processing of Materials, 2001

ISBN:
1-56700-165-3 (Print)

NANOMETRIC Al203 - ZrO2 POWDERS PRODUCTION BY ARC PLASMA TREATMENT

Nuno Cerqueira
LASEP: Laboratoire d'Analyse Spectroscopique et d'Energétique des Plasmas, UPRES-EA 3269 Faculté des Sciences, Site de Bourges, Université d'Orléans, rue Gaston Berger, BP 4043, 18028 Bourges Cedex France

C. Vandensteendam
Laboratory of Plasma Chemistry, University of Limoges,123 av. Albert Thomas, 87060 Limoges, France

Jean Marie Baronnet
Laboratory of Plasma Chemistry, University of Limoges,123 av. Albert Thomas, 87060 Limoges, France

Abstract

Spherical nanometric Al2O3 - ZrO2 powders have been prepared from commercial micrometric and irregular in shape ceramic oxides. A mixture of Sumitomo AES11SDC spray dried alumina and Magnesium Elektron S-grade zirconia (90/10 % in weight) was introduced during a few hours, with a rate of ~ 100 g/hour, through a lance and a screw feeder (under a flow of oxygen), inside the coupling zone of two plasma jets produced by a twin torch plasma system in a cylindrical furnace (arc current 200 to 400 A, voltage ~ 100 V; plasma forming gas: 20 NL/min of Ar at the anode, 10 NL/min of Ar and 10 NL/min of He at the cathode). Powders collected inside the heat exchanger and on the bag filter have been analysed by TEM, laser granulometry and X-ray diffraction. The aggregates of small particles (from a few nm to ~100 nm) observed contain α and δ Al2O3 and monoclinic and tetragonal ZrO2.