In this work, graphene nanoplatelets have been synthesized using liquid phase exfoliation of graphite flake powder. The exfoliated graphene nanoplatelets were identified and characterized by using UV–Visible–NIR spectroscopy, High resolution transmission electron microscopy, electron diffraction, scanning electron microscopy and X‐ray diffraction. The obtained graphene nanoplatelets and nano alumina at various weight ratios were dispersed in an epoxy matrix to enhance the surface roughness (Ra), micro hardness (Hv) and coefficient of friction (CoF) of epoxy hybrid nanocomposites. The results showed that the Ra and CoF value for the combined loading of 0.2 wt% of graphene nanoplatelets and 0.8 wt% of alumina into the epoxy was decreased to 41.02 and 20.01% whereas, the Hv value was increased to 10.04% when compared with the neat epoxy. The improved mechanical and tribological behaviors are suitable for the applications bearing and coating.

In this research, the different weight percentages of alumina and graphene nanoplatelets were homogeneously dispersed in the epoxy resin by a sonication and ball milling mixing process. The effect alumina and graphene nanoplatelets filled epoxy nanocomposites of physical, flexural, and dynamic mechanical properties were investigated. The epoxy nanocomposites showed a significant enhancement of 43.5% flexural strength and 29.5% flexural modulus for the combined filler loading of 2 wt% of alumina and 0.5 wt% of graphene nanoplatelets sample (EA2G0.5) than the neat epoxy. The EA2G0.5 epoxy nanocomposites sample showed an enhancement of 68.1% for the storage modulus. The loss modulus peak shifts toward the right side than the neat epoxy, which is showing better thermal stability of the composite. The differential scanning calorimetry technique was used to study the curing characteristics of the epoxy and epoxy nanocomposites. The scanning electron microscopy images of a fractured surface of the neat epoxy and alumina and graphene nanoplatelets filled epoxy nanocomposites showed the dispersion of the fillers, which is the sole cause of the enhancement of flexural properties. In general, these developed nanocomposites are suitable to be used as parent material in electrical and electronic packaging applications.

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Metal matrix composites [MMC] are most important materials used for recent works in the industry and engineering applications. Fly ash particles are used in metal matrix composites, are low costand low density are available in large quantities of waste by product in power plants. The adding of fly ash with aluminium reinforcement by using stir casting process it can reduces the cost and density of aluminium material. Metal composite processes are improved mechanical properties like strength, hardness, low density and good wear resistance compared to other metals. In this study,aluminium clad and fly ash chemical analysis is studied before and after mixing and forming as particulate metal matrix composite and comparing the mechanical, physical properties of the MMC at varying % of fly ash addition. By comparison at various levels 15% of fly ash the MMC gives good mechanical and physical properties. This type of MMC is widely useful in light weight vehicles and aerospace application.