Enhanced Fracture Toughness of Pressureless-sintered SiC Ceramics by Addition of Graphene

Graphene platelets enhanced pressureless- sintered B 4 C ceramics

“…Analogous tendency of the apparent mechanical properties above has been reported in other investigations [ 21 , 22 ]. The enhanced toughness mainly results from the pullout of GPL shown in figure 2 .…”

Preparation and mechanical properties of Si3N4 nanocomposites reinforced by Si3N4@rGO particles

“…Therefore, the improvement in Vickers hardness of the Si 3 N 4 @rGO nanocomposites can be explained by the observation that rGO can lead to microstructure refinement, which can increase the hardness by hindering the dislocation motion within the Si 3 N 4 grains. 41,42 However, the introduction of rGO sheets may increase the porosity of the nanocomposites. From the results in Table 1, the introduction of rGO affected the density of the composite, and an increased amount of rGO slightly reduced the relative density of the composite from 99.79% to 99.06%, which may result in a decrease in the hardness of the composites.…”

“…However, the relative density of the Si 3 N 4 @ rGO nanocomposites decreased slightly with increasing rGO content, because the rGO sheets tended to be distributed in the grain boundaries, which hindered the densification of the Si 3 N 4 @rGO nanocomposites during the sintering process. 41,42 However, the introduction of rGO sheets may increase the porosity of the nanocomposites. The Vickers hardness results, shown in Table 2, show that the hardness values of the Si 3 N 4 @rGO nanocomposites first increased from 16.6 to 18.6 GPa as the rGO content increased from 0 to 0.75 wt.%, respectively, and then decreased slightly as the rGO content increased from 0.75 to 2.25 wt.%.…”

Starch consolidation of SiC ceramics: processing and low-temperature sintering in an air atmosphere

“…Porous ceramics, especially highly porous SiC ceramics, have received significant attention recently because of their attractive properties such as low density; high surface area; good chemical stability; and high-temperature stability; low thermal expansion coefficient; good wear oxidation corrosion, and thermal shock resistance; controlled permeability; excellent high-temperature strength and catalytic activity; high thermal conductivity; and superior mechanical properties such as high specific strength and hardness [1][2][3][4][5][6]. Porous SiC ceramics have been considered as potential candidate materials for various technological applications, including hot-gas and molten metal filters, electrodes, heat exchangers, thermal insulating materials, diesel particulate filters, membrane and catalyst supports, vacuum chucks, gas burner media, sensors, refractory materials, preforms for composite fabrication, and lightweight structural materials [4][5][6][7][8][9][10][11][12][13][14][15].…”