Abstract: Multi-walled carbon nanotubes（MWCNTs)， molybdenum disulfide（MoS2)， ionic liquid （1-ethyl-3-methylimidazolium tetrafluoroborate， ［EMIm］BF4) and gum arabic（GA) were used to prepare stable dispersed water-based ILs-MWCNTs/MoS2 hybrid nanofluids.The tribological and thermophysical properties of hybrid nanofluids were studied，and the internal cooling grinding tests of hybrid nanofluids were compared with those of traditional grinding fluids， the grinding temperature and surface integrity of the two kinds of grinding fluids were analyzed.The results show that the grinding temperature， surface roughness and microhardness of hybrid nanofluids are reduced by 8.1%， 21.4% and 6.56%， respectively， the residual compressive stress is increased by 11.6 MPa， and the surface morphology is smoother and more regular. Therefore， the hybrid nanofluids reflect better grinding performance.The energy dispersive spectrometer（EDS) analysis results show that under the physical synergistic strengthening of ionic liquids and nanoparticles， the hybrid nanofluids exhibit excellent cooling and lubricating properties， and improve the grinding performance.

Key words: nanofluid, internal cooling, grinding performance, grinding temperature, surface integrity

摘要： 添加多壁碳纳米管（MWCNTs）、二硫化钼（MoS2)、离子液体（1-乙基-3-甲基咪唑四氟硼酸盐，［EMIm］BF4）和阿拉伯树胶（GA）制备成稳定分散的水基ILs-MWCNTs/MoS2混合纳米流体。研究了混合纳米流体的摩擦学性能和热物性，并与传统磨削液进行内冷却磨削对比试验，分析了两种磨削液条件下的磨削温度和表面完整性。研究结果表明：混合纳米流体的磨削温度、表面粗糙度和显微硬度分别降低了8.1%、21.4%和6.56%，残余压应力增大了11.6 MPa，表面形貌也更为光滑规整，混合纳米流体体现出了更好的磨削性能。能谱仪（EDS）分析结果表明，在离子液体与纳米颗粒的物理协同强化作用下，混合纳米流体表现出了优异的冷却与润滑性能，改善了磨削性能。

关键词: 纳米流体, 内冷却, 磨削性能, 磨削温度, 表面完整性