A comprehensive study on the influence of the polyorganosilazane chemistry and material shape on the high temperature behavior of titanium nitride/silicon nitride nanocomposites - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Journal of the European Ceramic Society Année : 2017

A comprehensive study on the influence of the polyorganosilazane chemistry and material shape on the high temperature behavior of titanium nitride/silicon nitride nanocomposites

Résumé

The high temperature crystallization behavior of polytitanosilazane-derived amorphous SiTiN ceramics was investigated in a nitrogen atmosphere using XRD, Raman spectroscopy, TEM, SEM and BET. At 1400 °C, TiN is the first phase to nucleate in SiTiN ceramics forming nanocomposites with a homogeneous distribution of TiN nanocrystals within an amorphous Si3N4 matrix. Above 1400 °C, XRD indicates that the temperature at which Si3N4 crystallizes depends on the volume fraction of TiN present in nanocomposites. This is closely related to the chemistry of the polyorganosilazanes used to synthesize polytitanosilazanes. The use of perhydridopolysilazane, the most reactive polyorganosilazane, allows preparing TiN/Si3N4 nanocomposites with a remarkable stability of the amorphous matrix up to 1800 °C as mesoporous materials and powders. Dense monoliths crystallize earlier than the powder analogs because of the use of an ammonia pre-treatment before polymer warm-pressing.

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Chimie
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Dates et versions

hal-01675122 , version 1 (04-01-2018)

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Abhijeet Lale, Vanessa Proust, Mirna Chaker Bechelany, Antoine Viard, Sylvie Malo, et al.. A comprehensive study on the influence of the polyorganosilazane chemistry and material shape on the high temperature behavior of titanium nitride/silicon nitride nanocomposites. Journal of the European Ceramic Society, 2017, Shaping of Advanced Ceramics, 37 (16), pp.5167 - 5175. ⟨10.1016/j.jeurceramsoc.2017.04.001⟩. ⟨hal-01675122⟩
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