and ionic liquids. The study found that the pressure viscosity coefficient of the tested WBLs is in the range of 1 to 5 Gpa-1
. The low-pressure viscosity behaviour
has both positive and negative aspects. A low α value will lead towards a poor film formation that will eventually result in premature component failure. On the contrary, the friction in full film lubrication will be 4-5 times lower than conventional oils. For transmission applications, the reduced friction is directly connected with load-dependent power losses that will help to enhance overall efficiency.
Conclusion
Undoubtedly, the lubricants industry is moving in the direction of reduced carbon emissions. Lubricants are now evaluated on more than just their tribological performance; factors such as their raw materials, manufacturing process, environmental impact, and end-of-life considerations are now significant judging criteria. To meet the strict fuel economy requirements, set by OEMs and regulators, engine oil formulators are attempting to reduce the viscosity of base fluids. These requirements are getting stricter, so formulators and suppliers need to come up with creative solutions to meet future demands.
Water-based or water-soluble lubricants have the potential to be the green lubricant of the future as discussed in this article. Still, there are a lot of areas for development to ensure state-of-the-art performance, endurance, and extended use life of the lubricated components. An optimisation in system components might be required to accommodate the sustainable solution. Redesign of the system, innovative surface treatments and the right additive chemistry are the keys to bring this type of sustainable lubrication applicable to real-life engineering applications.
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