Field assisted sintering of graphene reinforced zirconia ceramics

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

“…The research on ceramic/graphene composites has been mostly focused on enhancing the mechanical properties of ceramics and particularly of the fracture toughness parameter or K IC . Former studies were aimed at Al 2 O 3 and Si 3 N 4 ceramics [8][9][10][11], hence being presently the most extensively analysed systems [12][13][14][15][16][17][18], although now we can find studies on many ceramics of interest, such as SiC, ZrO 2 , ZrB 2 , B 4 C, TaC, TiC, Ti 3 Si 2 C, SiO 2 or hydroxyapatite (HA) [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. A general outcome from the available K IC data is the attested toughening effect induced by the graphene nanostructures.…”

Spark Plasma Sintered Zirconia Ceramic Composites with Graphene-Based Nanostructures

“…Shin and Hong [15] reported a reinforcement effect and an increase in electrical conductivity with respect to the monolithic ceramic using reduced graphene oxide (rGO) 7-8 nm thick. The highest reinforcement effect for SPS composites has been reported for a very low GNP content (0.01 wt%) (0.8-1.2 nm thick), [21] although this composition does not exhibit electrical conductivity (the percolation threshold is about 2.5 vol% in rGO composites [15]). A percolation threshold between 2.2 and 4.4 vol% GNP has been reported for 3YTZP/GNP composites [8].…”

Directional property evaluation of spark plasma sintered GNPs-reinforced hydroxyapatite composites

“…Moreover, increasing the sintering temperature also deteriorated the mechanical properties with the same GNPs content [3]. Al 2 O 3 -ZrO 2 composites containing 0.8 vol.% GNPs showed a 40% higher fracture toughness by crack bridging and deflection mechanisms than the composites without the GNPs.…”