Paper number 802
|FRICTIONAL BEHAVIOUR OF THE INTERFACE IN SIC MONOFILAMENT MODEL COMPOSITES WITH BOROSILICATE GLASS MATRIX|
H. Cherouali, N. Louet, P. Reynaud and D. Rouby
Groupe d'Etudes de Métallurgie Physique des Matériaux
GEMPPM UMR CNRS 5510, INSA de Lyon,
|Summary||A better knowledge of the cyclic fatigue effects in ceramic matrix composites needs a deeper understanding of the microscale mechanisms operating during friction between fibre and matrix. The present work deals with single filament model composites submitted to push-out tests at room temperature. Emphasis is made here on the effect of sliding velocity. The monofilament composites are made with a borosilicate glass matrix (Pyrex) and two types of silicon carbide filaments: SiC SCS-6 from Textron (coated with 3 ?m pyrocarbon) and SiC Sigma from BP (nominally uncoated). The composites have been tested by a succession of push-out and push-back runs. The changes of frictional force are analysed as the drive velocity is suddenly changed: the SCS-6/Pyrex system exhibits the well known velocity weakening whereas an opposite behaviour is observed with the Sigma/Pyrex system. Qualitative and quantitative aspects of these results are discussed as regards to the mechanisms operating at the contact between the sliding surfaces.
||Keywords|| glass matrix, silicon carbide monofilament, push-out test, interface behaviour, dry friction, stick-slip, sliding velocity, tribology.
Theme : Interface and Interphase
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