Nanoscale chemistry and mechanical properties of tribofilms on Al–Si alloy (A383): interaction of ZDDP, calcium detergent and molybdenum friction modifier

Autor:	Gavin Pereira, Yang-Tse Cheng, David Munoz-Paniagua, Andreas Lachenwitzer, Masoud Kasrai, Thomas A. Perry, T. W. Capehart, Peter R. Norton
Rok vydání:	2007
Předmět:	chemistry.chemical_classification Materials science Mechanical Engineering Inorganic chemistry Alloy chemistry.chemical_element Friction modifier Zinc Nanoindentation engineering.material XANES chemistry Molybdenum engineering General Materials Science Absorption (chemistry) Dithiocarbamate
Zdroj:	Tribology - Materials, Surfaces & Interfaces. 1:4-17
ISSN:	1751-584X 1751-5831
DOI:	10.1179/175158407x181499
Popis:	The interaction of a friction modifier and a calcium phenate detergent additive, with zinc dialkyl dithiophosphates (ZDDPs) in the formation of antiwear films on A383, has been studied using synchrotron radiation and nanoindentation techniques. X-ray absorption near edge structure (XANES) spectroscopy has shown that films prepared from oils containing both ZDDP and detergent, and ZDDP and molybdenum dithiocarbamate (MoDTC), are chemically similar to, but thicker than those made from oils containing only ZDDP. In addition, wear was greatly reduced in the presence of the detergent which was correlated with the basicity and the presence of the friction modifier. The phosphorus K and L edge XANES spectra show that the tribofilms are polyphosphate glasses of similar nature to those found on steel, but characterised by a shorter chain length. The sulphur K edge shows a MoS2 like film and under certain conditions, the presence of a sulphate species is detected. High resolution topographic images and mech...
Databáze:	OpenAIRE
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