Abstract
We review a recently developed molecular-level theory for the formation and functionality of zinc dialkyldithiophosphate anti-wear films [N. J. Mosey, M. H. Müser and T. K. Woo, Science 307 (2005) 1612]. This theory is based on the idea that pressure-induced cross-linking leads to chemically connected networks. The formation of cross-links modifies the mechanical properties of the films such that wear inhibition may be enhanced. Furthermore, the networks remain intact upon release of the pressure, which resists flow of the film out of the contact area. The ability of the theory to account for a diverse body of experimental data related to anti-wear additives and films is discussed. Routes towards the development of new AW additives are also suggested on the basis of the theory.
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Notes
Since submitting the manuscript, theoretical work by some of us indicated that the formation of long polyphosphate chains is mediated by temperature rather than by pressure [41]. This finding, which refines the statements made in Section 3.4, does not affect other conclusions drawn in this paper.
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The Natural Sciences and Engineering Research Council of Canada, General Motors of Canada Limited and General Motors Research and Development are gratefully acknowledged for financial support. Computational resources were made available by the Canadian Foundation for Innovation, the Ontario Innovation Trust, SHARCNet of Canada and the Academic Development Fund at the University of Western Ontario.
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Mosey, N., Woo, T., Kasrai, M. et al. Interpretation of experiments on ZDDP anti-wear films through pressure-induced cross-linking. Tribol Lett 24, 105–114 (2006). https://doi.org/10.1007/s11249-006-9040-9
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DOI: https://doi.org/10.1007/s11249-006-9040-9