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Étude comparative du comportement tribologique de revêtements frottant à grande vitesse sur un alliage de titane : CoCrAlYSiBN, CuNiIn, et MAO

Abstract : As part of the development of a new type of anodic coating for Ti6Al4V, its application to jet engine blades roots is studied. In the event of an impact of a foreign object on the blade, severe friction can occur between the blade root and the rotor disc, both in Ti6Al4V. This work aims to evaluate, under severe sliding conditions, the behaviour of reference coatings (CoCrAlYSiBN and CuNiIn), already applied to this contact, as well as the new coating (MAO). For this purpose, a specific tribometer was designed and adapted on a ballistic test bench, allowing to measure the friction forces during the interaction and to deduce the average friction coefficient. The wear volume and microstructure evolution was sliding speed and contact pressure, was analyzed. This led to propose tribological behaviour scenarios for coatings. From these results, it was possible to conclude that the studied MAO coating is not applicable to the blade foot/rotor disc contact under severe conditions. A thermal model incorporating the reduction of the friction coefficient caused by the third body was developed but still requires some evolutions before the sliding conditions can be linked to the microstructural alterations generated. The comparison of the thermal properties with the previous results has made it possible to propose a mechanism of action, according to its properties, of the coating on the thermal and mechanical alterations of the uncoated part. This thesis work was carried out as part of the MAO Project of IRT M2P and is the result of a collaboration between IRT M2P, LEM3, and Safran Aircraft Engines.
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Submitted on : Thursday, January 21, 2021 - 3:24:11 PM
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  • HAL Id : tel-03117797, version 1

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Mathieu Marquer. Étude comparative du comportement tribologique de revêtements frottant à grande vitesse sur un alliage de titane : CoCrAlYSiBN, CuNiIn, et MAO. Matériaux. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0402⟩. ⟨tel-03117797⟩

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