Tribological Mechanism on the Grinding Interface of Nickel-base Superalloy under Minimum Quantity Lubrication with Ionic Liquid and Palm Oil Based Nanofluids

doi:10.3901/JME.2024.19.159

Abstract

Abstract: To investigate the tribological mechanism on the grinding interface under minimum quantity lubrication (MQL) with ionic liquid and palm oil based nanofluids, nanofluids are prepared with [BMIM]BF₄ ionic liquid and palm oil as base fluid, and with five kinds of nanoparticles.Grinding experiments are performed under dry, MQL and nanofluid MQL conditions.The MQL grinding performance of ionic liquid and palm oil based nanofluids is compared, and their tribological mechanism of anti-wear and friction-reducing on grain/workpiece grinding interface is further revealed.The results show that [BMIM]BF₄ ionic liquid is more significant than palm oil in terms of reducing grinding force, the normal grinding force of [BMIM]BF₄ ionic liquid is lower by more than 10% compared with palm oil.However, palm oil is more remarkable in the aspect of reducing grinding force ratio and surface roughness.Only physical adsorption film is formed on the grinding interface with palm oil, whereas both physical adsorption film and chemical reaction film are formed with [BMIM]BF₄ ionic liquid.The chemical reaction film is rich in ferrous fluoride (FeF₂), of which the shear strength is low.The lubricating performance of the nanoparticles can be sorted as follow: two-dimensional layer structure (graphene (GN), molybdenum dioxide (MoS₂)) > three-dimensional spherical structure (aluminium oxide (Al₂O₃), copper (Cu)) > one-dimensional tubular structure (multiwalled carbon nanotube (MWCNT)).One-dimensional tubular MWCNT plays a role similar to rolling bearings only when its axis is perpendicular to grain moving direction.GN and MoS₂ with two-dimensional layer structure play the role of anti-wear and friction-reducing through their interlayer shear effect.Al₂O₃ nanoparticle, possessing three-dimensional spherical structure and high-hardness, also play a role like rolling bearings, and take the effect of mechanical polishing.Cu nanoparticle, also possessing three-dimensional spherical structure but low-hardness, form a layer of solid lubricating film through a series of tribological behaviors such compression and spread.

Key words: grinding, minimum quantity lubrication, nanofluid, ionic liquid, palm oil, nickel-based alloy

CLC Number:

TG156

WANG Dexiang, ZHANG Yu, JIANG Jingliang, LIU Xinfu, LIU Guoliang. Tribological Mechanism on the Grinding Interface of Nickel-base Superalloy under Minimum Quantity Lubrication with Ionic Liquid and Palm Oil Based Nanofluids[J]. Journal of Mechanical Engineering, 2024, 60(19): 159-171.

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