▎ 摘　　要

All manufacturing sectors use cutting fluids. Need for sustainable manufacturing discourages the application of cutting fluid as flood and encourages their application in small quantity strictly at the cutting zone, i.e., minimum quantity lubrication (MQL). But, MQL application requires development of cutting fluids with augmented properties. Present work performs quantitative analysis of dispersion, cooling and lubricating properties of graphene dispersed emulsifier oil. In the present work, initially 0.1 wt% graphene dispersed emulsifier oil samples are prepared by using different surfactants, sonication times and graphene to surfactant ratios and optimal conditions are identified which showed maximum dispersion stability. Absorbance method is use to evaluate dispersion stability. Use of Triton X100 with graphene to surfactant ratio of 1.5 and sonication time of 60 s is found to be the optimum condition. Properties like density, kinematic viscosity and dynamic viscosity are evaluated and ratio of graphene to surfactant is decided for 0.3 wt% and 0.5 wt% graphene dispersed emulsifier oil. Thermal conductivity and tribological properties are evaluated to quantitatively analyze the cooling and lubricating properties of graphene dispersed emulsifier oil. Emulsifier oil with 0.1 wt%, 0.3 wt% and 0.5 wt% graphene with surfactant Triton X100 added in same ratio as graphene showed enhancement viscosity which is 1.6, 2.6 and 3.4 times the viscosity of base emulsifier oil and also showed good stability. The corresponding thermal conductivities are found to be 1.1, 2 and 1.5 times the thermal conductivity of base emulsifier oil and coefficient of friction is found to decrease by 0.6%, 2.9% and 5.8%, respectively. Good stability, enhanced viscosity, thermal conductivity and reduced coefficient of friction make them suitable for machining applications.