Green cutting fluids (GCFs) offer an eco-friendly alternative to synthetic fluids by replacing mineral constituents with sustainable additives. Formulated with coconut oil as base, CAPB as emulsifier, garlic oil as extreme pressure additive, and almond oil as anti-oxidant, GCFs (B01 to B07) exhibit significantly higher viscosities, transitioning to non-Newtonian flow. Viscosity increases 16-27 times at 25°C and 100-121 times at 100°C. B03 and B04 show stable viscosity and excellent high-temperature performance. During tribological tests, B04 reduced friction by 8.6% and wear by 30.17%. Surface-analysis revealed smoother wear-tracks with sulphur-rich layers from garlic oil, confirmed by FESEM/EDAX. Incorporating garlic oil and almond oil resulted in shallow wear scars. For B04, skewness of 0.638 and kurtosis of 3.922 indicate deep valleys with rounder peaks, enhancing lubricant storage and flow GCFs B03 and B04 have shown excellent potential as replacement of mineral cutting fluids ensuring proper heat dissipation and effective wear protection.
Ashraf et al. (Thu,) studied this question.