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Lube-Tech Figure 11: The Wear Volumes for non-additivated greases


In order to get a better understanding of the achieved results, the tests are run with the base oils (without additive), Figure 12 compares the COF values of the three base oils.


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.136 page 7


the wear volume on the disk moves in the opposite direction which is more pronounced for the BO 600.


3.4 SRV test according to standard ASTM D5706 B The load carrying capacities of additivated greases using the SRV®


determined at 80 °C as described in the procedure. The results of these tests do not show any significant differences. By increasing the test temperature to 120 °C, we can differentiate between the greases and these results are shown and discussed here. It is assumed that at higher temperatures, the extreme pressure additive adheres more easily to the metal surface and is subsequently be activated resulting in the formation of a supporting film on the contact point as expected.


The test parameters were as follows: • Temperature: • Stroke:


120°C


• Frequency: • Time: • Load:


Figure 12: COF values of the three base oils • Load step:


1.5 mm 50 Hz


max. 55 min


50 N / 30 s, 100 N / 15 min 100 N every 2 min


Figure 15 illustrates exemplarily the progression of the values during this test for one of the greases. This grease achieved a maximal load of 1200 N.


standard method ASTM D5706 B were


Figure 13: The Wear Volumes for the three base oils


Figure 12 suggests that there might be a relationship between the viscosity of the oil and the friction coefficient; the higher viscosity the lower COF. This trend can also be found on the wear scar diameter on the ball at least for the most viscous oil (BO 600), Figure 13. However, in the same figure it is obvious that


Figure 13: Standard test ASTM D7506B for Grease E + additive package I


LUBE MAGAZINE NO.165 OCTOBER 2021


35


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