Journal
TRIBOLOGY LETTERS
Volume 46, Issue 3, Pages 211-220Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-012-9940-9
Keywords
Surface modification; Copper nanoparticles; Environmentally acceptable lubricating oil additive; Preparation; Tribological properties
Categories
Funding
- Ministry of Science and Technology of China [2007CB607606, 2009AA03Z326]
- National Natural Science Foundation of China [50975077]
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Oil-soluble Cu nanoparticles without phosphorus and sulphur elements were prepared using in situ surface-modification technique with hydrazine hydrate as a reductant and tetradecyl hydroxamic acid (THA) as a modifier. The phase composition, microstructure, and chemical structure of as-synthesized Cu nanoparticles (coded as THA-capped Cu or THA-capped nano-Cu) were analyzed by means of X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectrometry. The thermal stability of THA-capped Cu was examined using thermogravimetric analysis and differential thermal analysis. The antiwear ability of THA-capped Cu as an additive in liquid paraffin was examined using a four-ball machine, and the morphology of worn steel balls was examined using a scanning electron microscope, an energy dispersive spectrometer and an X-ray photoelectron spectroscopy. It has been found that THA-capped Cu can be well dispersed in some organic solvents. As-synthesized THA-capped Cu as an environmentally friendly additive in liquid paraffin shows excellent antiwear ability for the steel-steel contact. Besides, Cu nanoparticles are able to deposit and fill up micropits and grooves on steel sliding surfaces under a higher load and hence greatly reduced wear of the steel-steel pair thereat by way of self-repairing of worn surfaces of the steel-steel frictional pair, showing promising application as an environmentally acceptable lubricating oil additive.
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