| 摘要 |
The invention relates to an actuator comprising a sliding sleeve and an active piston, control means, wherein the sliding sleeve and the piston have at their interface at least one pair of friction layers, characterised in that at least one friction layer is made of a material selected from the following: an oxide of a Ti and Cr alloy; a zirconium matrix stabilised by Sc2O3 and/or Al2O3 and/or Cr2O3; a zirconium oxide in tetragonal phase stabilised by Y2O3; an alloy of Al, Fe and at least one other element.
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