Rolled and twisted graphene flakes as self-lubricant and wear protecting fillers into ceramic composites

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,...

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Bibliographic Details
Published inCarbon (New York) Vol. 159; pp. 45 - 50
Main Authors Llorente, Javier, Belmonte, Manuel
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 15.04.2020
Elsevier BV
Subjects
Atomic force microscopy
Ceramics
Composite materials
Fillers
Friction resistance
Graphene
Lubricants
Studies
Tribology
Wear resistance
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
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Summary: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. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.12.026