JACQUES, Sylvain; JOUANNY, I.; LEDAIN, Olivier; MAILLE, Laurence; WEISBECKER, Patrick

doi:10.1016/j.apsusc.2013.01.100

Laboratoire des Composites Thermostructuraux [LCTS]

JOUANNY, I.
Laboratoire des Composites Thermostructuraux [LCTS]

LEDAIN, Olivier
Laboratoire des Composites Thermostructuraux [LCTS]

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Article de revue

Ce document a été publié dans

Applied Surface Science. 2013-06-15, vol. 275, p. 102 - 109

Résumé en anglais

In Ceramic Matrix Composites (CMCs) reinforced by continuous fibers, a good toughness is achieved by adding a thin film called “interphase” between the fiber and the brittle matrix, which acts as a mechanical fuse by deflecting the matrix cracks. Pyrocarbon (PyC), with or without carbide sub-layers, is typically the material of choice to fulfill this role. The aim of this work was to study PyC-free nanoscale multilayered carbide coatings as interphases for CMCs. Nanoscale multilayered (SiC–TiC)n interphases were deposited by pressure-Pulsed Chemical Vapor Deposition (P-CVD) on single filament Hi-Nicalon fibers and embedded in a SiC matrix sheath. The thicknesses of the carbide interphase sub-layers could be made as low as a few nanometers as evidenced by scanning and transmission electron microscopy. By using the P-ReactiveCVD method (P-RCVD), in which the TiC growth involves consumption of SiC, it was not only possible to obtain multilayered (SiC–TiC)n films but also TiC films with a porous multilayered microstructure as a result of the Kirkendall effect. The porosity in the TiC sequences was found to be enhanced when some PyC was added to SiC prior to total RCVD consumption. Because the porosity volume fraction was still not high enough, the role of mechanical fuse of the interphases could not be evidenced from the tensile curves, which remained fully linear even when chemical attack of the fiber surface was avoided.< Réduire

Mots clés en anglais

Interphase

CMC

Reactive CVD

Multilayer

Carbide

Porosity

URI

https://oskar-bordeaux.fr/handle/20.500.12278/184509

DOI

http://dx.doi.org/10.1016/j.apsusc.2013.01.100

Unités de recherche

Laboratoire des Composites Thermo Structuraux (LCTS) - UMR 5801

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Nanoscale multilayered and porous carbide interphases prepared by pressure-pulsed reactive chemical vapor deposition for ceramic matrix composites

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Résumé en anglais

Mots clés en anglais

URI

DOI

Unités de recherche