In order to reveal the synergistic mechanism of nanoparticles,graphene/copper hybrid nanofluids are pre-pared by molecular-level mixing and mechanical mixing methods with biodegradable lubricant as base oil,by using few-layer graphene as the carrier and nano-copper as the supported metal particles,respectively.Under the conditions of the certain graphene/copper ratio and the mass fraction of nanoparticles,a single-factor experimental study of the minimal quantity lu-brication cutting AISI 304 stainless steel is conducted.The results show that the synergistic lubrication effect of the molecu-lar-level mixed nanofluid with the appropriate formulation is better than that of the mechanically mixed nanofluid,and the cutting temperature and cutting tool wear could be reduced,the surface quality could be improved during MQL processing.
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