Mechanical Properties of Hi-Nicalon Fibre-Reinforced Silicon Nitride Matrix Composites

Olivier, C.; Veyret, J.B.; Vidal-Sétif, M.H.

doi:10.4028/www.scientific.net/kem.127-131.753

Cited by 7 publications

(1 citation statement)

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“…Previous studies on CMCs with a PyC interphase 16,17 have already reported the importance of tailoring the interphase thickness and orientation. But, whereas a thick well-organised pyrocarbon results in a too weak fibre/matrix bonding, here a sufficient highly crystallised BN thickness allows, on the contrary, to limit the sliding.…”

Section: Relation Between Structures Of Fibre/matrix Interfaces and Minicomposite Mechanical Behaviourmentioning

confidence: 99%

SiC/SiC minicomposites with structure-graded BN interphases

Jacques¹,

López-Marure²,

Vincent³

et al. 2000

Journal of the European Ceramic Society

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BN interphases in SiC/SiC minicomposites were produced by infiltration of fibre tows from BF 3 -NH 3 -H 2 gaseous system. During interphase one-step processing, the tow travels through a reactor containing a succession of different hot areas. By TEM characterization, the BN interphases were found to be made of a structural gradient: from isotropic to highly anisotropic. The very first coating is poorly organised and allows protecting the fibre from a further chemical attack by the reactant mixture. The minicomposites were tensile tested at room temperature with unloading-reloading cycles. The BN interphases act as mechanical fuses; the fibre/matrix bonding intensity ranges from weak to rather strong depending on the tow travelling rate during interphase infiltration. The specimen lifetimes at 700°C under a constant tensile loading were measured in dry and moist air. Compared to a pyrocarbon reference interphase, the BN interphases significantly improve the oxidation resistance of the SiC/SiC minicomposites.

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Section: Relation Between Structures Of Fibre/matrix Interfaces and Minicomposite Mechanical Behaviourmentioning

confidence: 99%