Wear behavior of graphene/alumina composite

From bulk to cellular structures: A review on ceramic/graphene filler composites

“…In those first works, Hvizdos et al [48] and Belmonte et al [49] showed the potential of graphene fillers for enhancing the tribological performance of Si 3 N 4 ceramics, especially increasing the wear resistance in about 60% under dry [48] and isooctane lubricating [49] testing conditions. Later on, new graphene containing ceramic and glass composites have been explored and, at present, reports on the tribological performance of Si 3 N 4 [48][49][50][51][52], Al 2 O 3 [53][54][55][56], SiC [57], SiO 2 [58], bioglass [59] bulk composites, as well as ZrO 2 [60], Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) [61] and CaSiO 3 [62] coating composites, can be found. Table 1 summarizes some relevant information (testing conditions and results) of all these works.…”

“…Focusing on Al 2 O 3 -and Si 3 N 4 -based composites, the 15 materials more extensively investigated, some interesting results can be observed. In the case of Al 2 O 3 /graphene composites, an excellent wear performance was reported for very low amounts (0.5-1.0 vol.%) of GNP [53][54][55][56]; while for works where higher fillers contents (up to ~ 10 vol.%) were introduced the wear resistance decreased due to the formation of GNP agglomerates during the processing of the composites [56] or to their poor mechanical properties [55]. However, to achieve the best results for Si 3 N 4 /graphene composites, larger GNP contents were required (~4.4 vol.%) [48,49,52].…”

Tribological performance under dry sliding conditions of graphene/silicon carbide composites

“…Hvizdos et al [16] reported a 60% improvement in the wear performance under dry sliding conditions for 3 wt.% GNPs/Si 3 N 4 composites, although GNPs did not decrease the friction coefficient. Graphene/Al 2 O 3 composites [18,19] also showed remarkable improvements (up to one order of magnitude) on the wear resistance when compared to the monolithic alumina, jointly with slight decreases on friction. This tribological performance was related to the development of a hard and lubricating graphene layer on the Al 2 wear environments and prevented the cracking of these ceramics.…”

“…[13] and [14] for a review), but considerably less work can be found on graphene/ceramic materials. At the time of writing, silicon nitride (Si 3 N 4 ) [15][16][17], alumina (Al 2 O 3 ) [18,19], silica (SiO 2 ) [20] and zirconia (ZrO 2 ) [21] ceramics containing graphene have been tribologically characterized. Some of the present authors [15] observed that the addition of 3 wt.% of graphene nanoplatelets (GNPs) to a Si 3 N 4 matrix reduced the friction and improved the wear resistance up to 56% under isooctane lubricated conditions due to the exfoliation of the nanoplatelets and the creation of an adherent protective tribofilm.…”

Co-deposition of Cu/WC/graphene hybrid nanocomposites produced by electrophoretic deposition

“…For the Cu/Graphene coating, the reduction in coefficient of friction could be ascribed to the lubrication effect of graphene sheets. Moreover, the nano sheets are multilayered reinforcements and it is easy to bend and tilt the graphene sheets toward the surface of composite coating, thus we suggested that the decrease in friction coefficient could be attributed to the flattening effect of graphene sheet asperities by sliding multilayered graphene nano sheets leading solid lubrication [35,36]. Fig.…”