| To use grinding fluid for cooling and lurbrication,during precision and ultra-precision grinding of superalloy,thus improving grinding efficiency and quality.The conventional grinding fluid contain toxic additives that cause harm to the human body and environment during use.As a novel cooling medium,nanofluid is environmentally friendly and harmless.In recent years,on this basis,it has been proposed to add a variety of nanoparticles to the base fluid to prepare hybrid nanofluid,which has the performance of different nanoparticles.The excellent cooling and lubricating properties of the hybrid nanofluids make it a promising new environmentally friendly and efficient grinding fluid to replace traditional grinding fluids.In this paper,IL-MWCNTs/Mo S2 hybrid nanofluid was developed by using deionized water as the base fluid,adding multi-walled carbon nanotubes?MWCNTs?,molybdenum disulfide?Mo S2?and ionic liquid?[EMIm]BF4?,and used as grinding liquid.First of all,the dispersion stability,tribological property and thermal property were studied experimentally and the mechanism of anti-wear and anti-friction were discussed.Next,the conventional grinding fluid and IL-MWCNTs/Mo S2 hybrid nanofluid were respectively applied to pressurized internal-cooling grinding superalloy,and the grinding temperature and surface integrity under the two kinds of cooling and lubricationg media were compared and analyzed.Therefore,a green grinding fluid is designed and prepared and applied to pressurized internal cooling grinding,thereby achieving green precision machining of aerospace components.The main content of the paper are as follows:?1?"Two-step method"was used to prepare the IL-MWCNTs/Mo S2 hybird nanofluid,and its dispersion stability performance was analyzed.The dispersion stability of IL-MWCNTs/Mo S2 hybird nanofluid was improved by physical and chemical methods.The dispersion of MWCNTs in the base fluid was improved by the?-?interaction of[EMIm]BF4and MWCNTs.Furthermore,the absorbance was used as the analysis index to compare and analyze the dispersion stability of sodium dodecylbenzene sulfonate?SDBS?,gum arabic?GA?and polyethylene glycol 600?PEG600?to the entire system of IL-MWCNTs/Mo S2 hybird nanofluid.The best dispersant was selected for the IL-MWCNTs/Mo S2 hybird nanofluid.Finally,the particle size of IL-MWCNTs/Mo S2 hybird nanofluid with the best dispersant was analyzed.?2?The tribological and thermo-physical properties of IL-MWCNTs/Mo S2 hybrid nanofluid were analyzed.The HRS-2M high-speed reciprocating tribotester was used to conduct the friction and wear test.The effects of different ratios?mass ratio?of MWCNTs and Mo S2 on the tribological properties of deionized water were studied,and the optimal ratio between MWCNTs and Mo S2 was determined.Combined with the results of X-ray electron spectroscopy?XPS?,the anti-wear and anti-friction mechanism of the IL-MWCNTs/Mo S2hybird nanofluid was discussed.Next,the contact angle,thermal conductivity meter and rotational viscometer were used to measure the contact angle,thermal conductivity and viscosity of the optimal ratio of IL-MWCNTs/Mo S2 hybird nanofluid.?3?The prepared IL-MWCNTs/Mo S2 hybird nanofluid was used as the cooling lubricating medium in the pressurized internal-cooling grinding experiments.Under the equal experimental parameters,taking the surface integrity and grinding temperature as the analysis index,the grinding performance of the IL-MWCNTs/Mo S2 hybird nanofluid and the conventional grinding fluid were contrastive analyzed.The mechanism of IL-MWCNTs/Mo S2hybird nanofluid in the grinding zone was explored. |
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