WYNN, Mélanie; LOPEZ-FERBER, David; VIARD, Antoine; FONBLANC, Diane; SCHMIDT, Marion; ROSSIGNOL, Fabrice; CARLES, Pierre; CHOLLON, Georges; GERVAIS, Christel; BERNARD, Samuel

doi:10.1016/j.oceram.2021.100055

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Article de revue

Ce document a été publié dans

Open Ceramics. 2021, vol. 5, p. 100055

Résumé en anglais

The thermal stability, elemental/phase composition evolution and crystallization behaviour of Si–B–C–N ceramics obtained by the pyrolysis of a series of poly (vinylmethyl-co-methyl)silazanes displaying various boron contents were investigated through annealing in the temperature range 1000–1800 °C under nitrogen atmosphere. The increase of the boron content in the early stage of the process involved the nucleation of β-SiC, inhibited the crystallization of α-Si3N4 and modified the activity of the sp2-hybridised carbon phase in the derived ceramics obtained at 1000 and 1400 °C. At 1800 °C, low boron content Si–B–C–N ceramics gradually evolved toward a major SiC phase mainly formed via the carbothermal reaction of amorphous Si3N4 whereas high boron content Si–B–C–N ceramics led to highly stable materials with a complex microstructure made of SiC, Si3N4 and a BN-rich B(C)N phase that inhibited the activity of sp2-hybridised carbon toward the carbothermal reaction of amorphous Si3N4 and significantly reduced the SiC crystallization process.< Réduire

Mots clés en anglais

Si–B–C–N

Polysilazanes

Boron

Polymer derived ceramics

Crystallization

URI

https://oskar-bordeaux.fr/handle/20.500.12278/123856

DOI

http://dx.doi.org/10.1016/j.oceram.2021.100055

Lien vers les données de la recherche

https://doi.org/10.1016/j.oceram.2021.100055

Unités de recherche

Laboratoire des Composites Thermo Structuraux (LCTS) - UMR 5801

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Tuning of the high temperature behaviour of Si–C–N ceramics via the chemical crosslinking of poly(vinylmethyl-co-methyl)silazanes with controlled borane contents