Lube-Tech


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.151 page 5 Figure 4: Electrical conductivity.


Friction coefficient (via MTM) Stribeck curves were taken on both fresh and aged oils at temperatures from 40 °C to 140 °C. Of greatest interest are the results shown below in Figure 5. A common issue with Mo-DTCs is that they tend to show excellent anti-friction behaviour when tested in fresh oils, but lose that benefit with ageing. This is shown in Figure 5, with higher friction values observed for the aged Mo-DTC, relative to the fresh oils. The B-AMIDE similarly demonstrates relatively high friction in aged oils, but since its primary use is as an anti-wear additive, the higher friction value is not unexpected. The interesting benefit is seen when these two additives are combined, as with Formula F. With the combination, a synergistic friction benefit is observed between the two additives. The benefit is minimal at higher temperatures, but more pronounced at 40 °C. This may be significant in the context of EV formulations, where operating temperatures are much lower than in conventional ICE engines.


Figure 5: MTM Stribeck friction curves of Aged Oils.


LUBE MAGAZINE NO.180 APRIL 2024


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