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Lube-Tech


Comparing the wear values, the results are not the same as for BO 150. Regarding lithium complex as thickener the additive can reduce the wear volume especially on disk and, consequently, the total wear volume is lower. In this case the additive was, most probably, able to build-up a supporting layer on the disk.


Figure 8 shows significantly higher wear volume on disk for the lithium thickener, despite the fact that this test was repeated twice. Hence, it is speculated that the differences in polarity between the additive molecules and this thickener may, at least to some extent, cause some antagonistic effects.


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.136 page 6


Figure 9: Friction Coefficient for the Greases based on BO 600


Figure 10: Wear volumes of different greases based on BO 600 after running SRV®


tests Figure 8: Wear volumes of different formulated greases based on BO 400


3.3 Tribological tests on the greases based on BO 600 In Figure 9, the friction coefficients for the six greases based on BO 600 are presented. A positive effect of the additive package I on COF values is obtained for both thickener systems (lithium and lithium complex) in line with the previously reported data related to greases based on BO 150 and BO 400. However, the new finding is that the increased concentration of the extreme-pressure additive (Additive package II) has no effect on greases with either thickener system which lead us to the conclusion that more additive does not necessarily result in better performance, at least in this type of tribological contact.


In Figure 10, it is interesting that for both thickener systems the extra dosage of extreme-pressure additive (Additive package II) has a negative impact on this tribological system. One possible explanation could be that active sulphur content in the extreme pressure additive interferes with the anti-wear additive when the dosage is increased.


Comparison of the tribological behaviour of the two thickener systems recorded by SRV Within the frame of our SRV measurements, it has been found that the wear volume for additivated greases are not following expectations. For example, Figure 11 which shows the wear values of three non-additivated greases with different base oil viscosity and the corresponding ones with lithium and lithium complex thickener confirm that the greases based on highest base oil viscosity (BO 600) contribute to highest wear volume while the wear on the ball remains the lowest.


34 LUBE MAGAZINE NO.165 OCTOBER 2021


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