▎ 摘　　要

Dry reciprocating sliding tests have been performed on cubic yttria-stabilized zirconia ceramic composites containing graphene nanoplatelets. The composites exhibit an excellent friction response and, especially, an outstanding improvement of the wear resistance of more than two orders of magnitude, as compared to unfilled ceramics. The enhanced tribological response of these composites is much greater than that commonly reported for ceramic/graphene materials. The deep analysis of worn surfaces by combining confocal Raman, scanning electron and atomic force microscopies reveals the presence of abundant twisted graphene-based rolls on top of a thick carbonaceous tribofilm that played a decisive protagonist to extraordinarily improve the tribological performance of the composites through a roller-bearing like effect. (C) 2019 Elsevier Ltd. All rights reserved.