Commissariat a L'energie Atomique

Romuald Dez

Nathalie Herlin-Boime

The invention provides a method of synthesizing a Si/C/N/E/F/G/O multielement nanopowder that is directly suitable for sintering, E, F, and G representing three distinct metallic elements other than Si, and at least one of a, b, and c being non-zero. The nanopowder is obtained by laser pyrolysis of an aerosol comprising at least one metal precursor, hexamethyldisilazane SiCNHused as the sole solvent for said at least one metal precursor, and silane SiH. Each grain of the resulting nanopowder contains all of the elements Si, C, N, E, F, G, and O, and the chemical composition of the nanopowder in terms of equivalent stoichiometric compounds is such that its free carbon content is less than 2% by weight and its SiOcontent is less than 10% by weight. The use of this nanopowder for fabricating a SiN/SiC composite ceramic.

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Suippes, France

Romuald Dez