Tribological performance and drilling characteristics of green synthesized graphene reinforced AA7075 B4C Brid Self lubricating composites

Abstract

Graphene is a two-dimensional material and its atoms are arranged and newlinestructured in a honeycomb lattice network. Graphene possesses exceptional newlinemechanical properties and a remarkable inherent electron mobility. Graphene newlineis the most robust and lightweight material. It is used in advanced composites, newlineaerospace materials, sensors, solar cells and batteries in addition to the newlinetransistor and semiconductor sectors. newlineMechanical and chemical exfoliation, chemical vapour deposition, newlineepitaxial growth on SiC and liquid phase exfoliation are a few of the methods newlinethat can be used to synthesize graphene. However, each of these methods has newlineits own set of challenges. The chemical exfoliation technique used to develop newlinegraphene causes the discharge of dangerous NO2 and N2O4 gases. In order to newlinechemically separate graphene from graphite, hydrazine, a strong reducing newlineagent, was frequently utilised. However, hydrazine is caustic and highly newlinecombustible, making it dangerous for both people and the environment. High newlinetemperature is the primary drawback of developing graphene through epitaxial newlinegrowth and it requires a long time to produce graphene by mechanical exfoliation. newlineLarge-scale production of aluminum hybrid composites at a low cost are newlinegenerally fabricated using the liquid metallurgy method. In order to overcome newlinethe drawbacks of lubricants and solid lubricant coatings, researchers are newlinecurrently emphasizing on embedding carbonous materials and self-lubricating newlinematerials into metal matrices to develop self-lubricating composites. Drilling newlinemetal matrix composites is complicated due to burr generation caused on by newlinethe presence of rigid reinforcements, high drilling forces and abrasive wear on newlinethe cutting edge. newline newline