TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Co-SWNTs-like Material as Antiwear and Extreme Pressure Additive for Biodegradable Lubricants
(Co-SWNTs-ca aditiv antiuzură şi extremă presiune pentru lubrifianţi biodegradabili)
Vol LXIV • No. 1/2012
Diana Cursaru, Constantin Tănăsescu
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: dianapetre@upg-ploiesti.ro

 Keywords   SWNTs, AW and EP additives, biodegradable lubricants.

 Abstract
This paper describes the antiwear (AW) and extreme pressure (EP) potential of Co-based single wall carbon nanotubes (SWNTs) for a biodegradable oil, in comparison with two commercial antiwear and extreme pressure additives, commonly used as additives for mineral oils. Friction coefficients and the thickness of lubricant layer were determinate by using HFRR equipment, while a four ball tester was used to evaluate the extreme pressure properties. The single wall carbon nanotubes were produce by chemical carbon vapor deposition (CCVD) and were characterized by transmission electron microscopy (TEM) and the diameter of the tubes were determinate by RAMAN spectroscopy. According to our experimental results, SWNTs is more efficient antiwear additive rather than commercial AW additives but is less efficient extreme pressure additive.

 Rezumat
Această lucrare descrie potenţialul antiuzură(AW) şi extremă presiune (EP) al nanotuburilor de carbon cu un singur perete (SWNTs) pentru un ulei biodegradabil, prin comparaţie cu doi aditivi antiuzură şi extremă presiune comerciali, utilizaţi cu succes ca aditivi pentru uleiurile minerale. Coeficienţii de frecare şî grosimea peliculei de lubrifiant au fost determinate cu ajutorul echipamentului HFRR în timp ce o maşina cu 4 bile a fost utilizată pentru a evalua proprietăţile de extremă presiune. Nanotuburile de carbon au fost sintetizate prin metoda de depunere chimică a vaporilor de carbon şi au fost caracterizate prin microscopie electronică de transmisie iar diametrul tuburilor au fost determinate prin spectroscopie RAMAN. Conform rezultatelor experimentale, SWNTs este un aditiv antiuzura mai eficient decât aditivii AW comerciali dar este un aditiv de extremă presiune mai puţin eficient.



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