Effect of hBN/MoS2 hybrid nanofluid minimum quantity lubrication on the cutting performance of self-lubricating ceramic tools when machining AISI 4340

Abstract

Difficult-to-machine materials have consistently limited the improvement of machining efficiency. To address this challenge, this study proposes a strategy of combining Al₂O₃/SiC/G self-lubricating ceramic tools with hBN/MoS₂ hybrid nanofluids. The experiment evaluates the ratio and concentration of the hBN/MoS₂ hybrid nanofluid based on cutting forces, friction coefficients, cutting temperatures, surface roughness, and tool wear. Results show that better lubrication is achieved by hBN/MoS₂ hybrid nanofluids compared to single nanofluids. The optimal hBN/MoS₂ mixing ratio and nanofluid concentration are 2:1 and 1.5 wt%, respectively. Finally, the cutting lubrication mechanism and the synergistic mechanism of self-lubricating ceramic tools with hybrid nanofluids were proposed.