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Article Dans Une Revue Wear Année : 2009

Tribological, physicochemical and thermal study of the abrupt friction transition during carbon/carbon composite friction

Résumé

Due to their thermo-mechanical performances maintained at high temperature, C/C composites demonstrate their advantages in high energy aeronautical braking. During friction a typical tribological behavior was observed. At first, an abrupt transition of friction coefficient takes place systematically from a weak value (not, vert, similar0.15) to a high value (not, vert, similar0.35). Before this transition, an extremely weak wear rate is associated to a weak friction coefficient value and no gas exchanges occur in the contact, this regime being called non-reactive. From the abrupt transition, a very high wear rate and strong gas exchanges associated to the high friction value occur (reactive regime). In this paper, for a better understanding of the mechanisms governing the abrupt transition during C/C composites tribological, mechanical, thermal and physico-chemical data are analyzed. Friction tests are performed on a 3D C/C composite consisting of PAN-based fibers and CVI pyrocarbon matrix in using a pin-on-disc tribometer equipped with a mass spectrometer allowing the in situ gas exchange analysis (CO2 production, O2 consumption) in the contact. To follow the disc surface temperature evolution before, during and after the transition, a thermal infrared camera is used. After friction, worn surfaces and interfaces are characterized by optical microscopy and scanning electron microscopy. In a final analysis, a mechanism is proposed to explain the abrupt transition.

Dates et versions

hal-00390925 , version 1 (03-06-2009)

Identifiants

Citer

Haytam Kasem, Sylvie Bonnamy, Yves Berthier, Philippe Dufrenoy, P. Jacquemard. Tribological, physicochemical and thermal study of the abrupt friction transition during carbon/carbon composite friction. Wear, 2009, 267 (5-8), pp.846-852. ⟨10.1016/j.wear.2008.12.076⟩. ⟨hal-00390925⟩
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