Synthesis of SiCNAl(O) pre-alloyed nanopowders by pyrolysis of an aluminosilazane aerosol - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of the European Ceramic Society Année : 2007

Synthesis of SiCNAl(O) pre-alloyed nanopowders by pyrolysis of an aluminosilazane aerosol

Résumé

A liquid aluminosilazane precursor, with various Al contents, was synthesized by direct reaction between hexamethyldisilazane and trimethylaluminum at room temperature. Mass spectrometry and Fourier-transform infrared spectroscopy showed respectively a methane evolution and the formation of Al N bonds. Thermal-spray pyrolysis of this precursor was realized under different conditions: temperature (1200–1400 ◦C), pyrolysis atmosphere (Ar, Ar/NH3) and gaseous flow rate (1 and 3 L min−1). SEM micrographs revealed spherical SiCNAl(O) nanopowders which size (20–180 nm in diameter) depending on the residence time duration of the product in the furnace. Pyrolysis under argon led to a high C content, and then to the presence of free carbon and amorphous SiC phase detected by XRD and NMR analysis. Introduction of ammonia in the pyrolysis atmosphere induced an important decrease of C content in the pre-alloyed nanopowders, correlated with an increase of N and Al.With this process, multielement nanopowders with an adjustable composition exhibit a higher thermal stability than powders processed by laser-spray pyrolysis with an equivalent precursor.

Dates et versions

hal-00131230 , version 1 (15-02-2007)

Identifiants

Citer

V. Salles, Sylvie Foucaud, Etienne Laborde, Eric Champion, P. Goursat. Synthesis of SiCNAl(O) pre-alloyed nanopowders by pyrolysis of an aluminosilazane aerosol. Journal of the European Ceramic Society, 2007, 27, pp.357-366. ⟨10.1016/j.jeurceramsoc.2006.04.168⟩. ⟨hal-00131230⟩
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