Mechanical properties of silicon carbide/graphene nanoplatelets composites prepared by spark plasma sintering
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Silicon carbide (SiC)/graphene nanoplatelets (GNPs) ceramic composites with additions of 0, 1, 2, 4, 6, 8 wt.% GNPs werefabricated by spark plasma sintering (SPS). Effects of GNPs addition on densification, microstructure and mechanicalproperties (vickers hardness and fracture toughness) of the SiC/GNPs composites were investigated. As GNPs contentincreased, relative density of the composites decreased slightly from 99.0% for monolithic SiC to 98.3% at 8 wt.% GPNs. Uniform distribution of GNPs in the microstructure was exhibited. Vickers hardness was increased by 7% (25.4 GPa) inthe 1 wt.% GNPs composition relative to monolithic SiC (23.5 GPa). The Vickers hardness and fracture toughness changesindicated different states of GNPs existence in the SiC/GNPs composites, among which thin-layered GNPs wrapping SiCgrains could benefit Vickers hardness relative to agglomeration of GNPs.
Abstract
Silicon carbide (SiC)/graphene nanoplatelets (GNPs) ceramic composites with additions of 0, 1, 2, 4, 6, 8 wt.% GNPs werefabricated by spark plasma sintering (SPS). Effects of GNPs addition on densification, microstructure and mechanicalproperties (vickers hardness and fracture toughness) of the SiC/GNPs composites were investigated. As GNPs contentincreased, relative density of the composites decreased slightly from 99.0% for monolithic SiC to 98.3% at 8 wt.% GPNs. Uniform distribution of GNPs in the microstructure was exhibited. Vickers hardness was increased by 7% (25.4 GPa) inthe 1 wt.% GNPs composition relative to monolithic SiC (23.5 GPa). The Vickers hardness and fracture toughness changesindicated different states of GNPs existence in the SiC/GNPs composites, among which thin-layered GNPs wrapping SiCgrains could benefit Vickers hardness relative to agglomeration of GNPs.
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