Chemical and mechanical properties of ZDDP antiwear films on steel and thermal spray coatings studied by XANES spectroscopy and nanoindentation techniques

Mark A. Nicholls, Than Do, Peter R. Norton, G. Michael Bancroft, Masoud Kasrai, T. Weston Capehart, Yang Tse Cheng, Thomas Perry

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

X-ray Absorption Near Edge Structure (XANES) has been used to characterize the chemistry of tribochemical wear pads generated from a paraffinic base oil with a zinc-dialkyl-dithiophosphate additive on steel surfaces and high-velocity oxygen fuel (HVOF) thermal spray coatings. The phosphorus K- and L- edge XANES spectra show that the tribofilms formed on steel and the HVOF coatings have the same chemical nature. Also, mechanical properties of these tribofilms were examined by nanoindentation techniques using both Hysitron and Interfacial Force Microscopy (IFM) instruments. The elastic moduli extracted from indentation force-displacement (f-d) curves have demonstrated that tribofilms on steel and HVOF coatings have similar surface topography and mechanical properties.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalTribology Letters
Volume15
Issue number3
DOIs
StatePublished - Oct 2003

Bibliographical note

Funding Information:
The authors would like to thank Larry Byrnes and Martin Krammer of GM Powertrain for supplying the HVOF samples and for many helpful discussions. We are also grateful to Jan Herbst for his valuable comments on this manuscript. Useful discussions with Claire McCague and Milan Kovar are also gratefully acknowledged. The authors are grateful to the staff at the Canadian Synchrotron Radiation Facility (CSRF) and to the staff of the Synchrotron Radiation Centre (SRC), University of Wisconsin, Madison, for their technical support. We are grateful to the National Science Foundation (NSF) for supporting the SRC under Award #DMR-95-31009. Financial support was provided by General Motors of Canada Ltd. and NSERC.

Keywords

  • Antiwear films
  • Nanoindentation
  • Nanomechanical properties
  • Nanotribology
  • Polyphosphate
  • XANES
  • ZDDP

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'Chemical and mechanical properties of ZDDP antiwear films on steel and thermal spray coatings studied by XANES spectroscopy and nanoindentation techniques'. Together they form a unique fingerprint.

Cite this