journal article·2022-10Open access

Relationship between both thickness and degree of crystallisation of BN interphases and the mechanical behaviour of SiC/SiC composites

Héloïse Delpouve, Gérald Camus, Stéphane Jouannigot, Bruno Humez, Hervé Plaisantin, Claudie Josse, Sylvain Jacques

Journal of Materials Science· Volume 57· Issue 37

Abstract

SiC/BN/SiC-Si single-ply composites with Hi-Nicalon STM fibres were synthesised by chemical vapour infiltration and the liquid route. These are model composites representing the behaviour of industrial composites intended to be used as structural parts in the hot sections of aeronautical engines. Four interphases with two different degrees of crystallisation and, in each case, two different thicknesses were tested. The interfacial shear stress measured by fibre push-out test is significantly higher when the crystallisation degree of the BN interphase is low, yet in this case it decreases with the thickness of the interphase. This higher interfacial bonding is also associated, albeit less significantly, with better macromechanical properties as measured by tensile and shear tests. The cracks observed in the composite with different microscopy techniques are also less long and open. Depending on the interphases, the debonds are more or less pronounced and occur preferentially at different locations in the interfacial system.
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Research context

OpenAlex topics: Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties · Silicon Carbide Semiconductor Technologies

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