Variation in zinc dialkyldithiophosphate yield strength measured by nanopillar compression

Lin, Feng; Hao, Rui; Gaemers, Sander; Warrens, Christopher P.; Dillon, Shen J.

doi:10.1016/j.triboint.2018.03.020

Cited by 2 publications

(1 citation statement)

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“…Sometimes a gold film is used but either this is very thin and applied only to increase the yield of secondary electrons or to avoid sample charging [18,19], or the reason for the film and its thickness are not reported [20]. One notable exception is recent work by Liu et al [21] and Feng et al [22] who deposited thick Cr and Cu layers on ZDDP tribofilms, both to protect the latter during FIB and also to provide a sacrificial layer that could be flattened to enable nanopillar compression measurement.…”

Section: Damage To Zddp Films Using Fibmentioning

confidence: 99%

Use of FIB to Study ZDDP Tribofilms

et al. 2018

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Focussed ion beam milling (FIB) followed by TEM has been used to study ZDDP tribofilms on rubbed steel surfaces. It has been found that the impact of high energy platinum and gallium ions during FIB causes significant morphological and structural changes to the uppermost 30-50 nm of a ZDDP tribofilm. This can be prevented by the low energy deposition of a quite thick gold layer prior to installation of the sample in the FIB facility. This problem, and its solution, have been quite widely reported in the non-tribology literature but have not previously been highlighted in the application of FIB to study tribological surfaces. It has also been found, using this gold pre-deposition method, that the bulk of the ZDDP tribofilm studied has a polycrystalline structure.

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