The present invention relates to an actuator comprising a sleeve (1) to slide and a piston which is active, the control means, the liner to slide and the piston having at their interface, at least one pair of friction layers, characterized in that at least one friction layer is made of a material selected from among: - one oxide of an alloy of ti, cr; - a matrix of zirconia stabilized by the sc2o3 and / or al2o3 and / or cr2o3; - an oxide of zirconium in the tetragonal phase stabilized by the y2o3; - an alloy of al, fe and of at least one other element.
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