Preparation of C/SiC ceramics using a preceramic polycarbosilane synthesized via hydrosilylation

Fabien Bouzat (1) , Alexandra-Raluca Graff (2) , Romain Lucas (1) , Sylvie Foucaud (1)

1 SPCTS-AXE1 - Axe 1 : procédés céramiques
2 University Polithenica of Bucharest

This paper deals with the preparation of C/SiC powders via the pyrolysis of a novel polycarbosilane, synthesized by hydrosilylation. The preceramic polymer structure was studied by 1H, 13C and 29Si NMR, and in situ dynamic IR analysis. A pyrolysis up to 1800 °C of this low molecular weight polymer led to β-SiC particles dispersed in a carbon matrix. The excess of free carbon was revealed by elemental analysis and High-Resolution TEM. The ceramization behavior was discussed thanks to TGA/DTA-MS, and XRD analyses. Thus, the crystallization was effective for pyrolysis temperatures above 1200 °C, and the ceramic yield reached a value of 62%. This present study highlights the potential of hydrosilylation to prepare C/SiC powders.

Mots clés: Silicon Carbide; Hydrosilylation; Polymer precursor; Pyrolysis; High-resolution TEM

Domaines: Matériaux; Matériaux

Fabien Bouzat, Alexandra-Raluca Graff, Romain Lucas, Sylvie Foucaud. Preparation of C/SiC ceramics using a preceramic polycarbosilane synthesized via hydrosilylation. Journal of the European Ceramic Society, 2016, 36 (12), pp.2913 - 2921. ⟨10.1016/j.jeurceramsoc.2015.11.032⟩. ⟨hal-01875197⟩