Hydroquinone bis(diphenyl phosphate) as an Antiwear/Extreme Pressure Additive in Polyalkylene Glycol for Steel/Steel Contacts at Elevated Temperature

The tribological behaviors of hydroquinone bis(diphenyl phosphate) (HDP) and tricresyl phosphate (TCP) for polyalkylene glycol (PAG) were evaluated at 200 °C. Results showed that HDP could effectively reduce the friction coefficient and prevent wear of sliding pairs during the test. The best tribological properties of HDP achieves at the concentration of 4 wt %. At this level, the wear volume of the lower disk can be reduced by a factor of 2.4 and the load-carrying capacity can increase from 500 N to 930 N, with respect to pure PAG. Furthermore, HDP exhibited better antiwear (AW) and extreme pressure (EP) properties than TCP, despite the fact that their friction-reducing performances were similar. Boundary lubrication films composed of FeOOH, Fe2O3, FePO4, and polyether compounds were formed on the worn surface, which resulted in excellent friction reduction and AW performance.

[1]  Feng Zhou,et al.  Tribological properties of novel imidazolium ionic liquids bearing benzotriazole group as the antiwear/anticorrosion additive in poly(ethylene glycol) and polyurea grease for steel/steel contacts. , 2011, ACS applied materials & interfaces.

[2]  M. Froment,et al.  Reaction of cresyl saligenin phosphate, the organophosphorus agent implicated in aerotoxic syndrome, with human cholinesterases: mechanistic studies employing kinetics, mass spectrometry, and X-ray structure analysis. , 2011, Chemical research in toxicology.

[3]  Mingjin Fan,et al.  Imidazolium hexafluorophosphate ionic liquids as high temperature lubricants for steel–steel contacts , 2010 .

[4]  L. Rudnick.  Lubricant Additives : Chemistry and Applications, Second Edition , 2009 .

[5]  G. de Nola,et al.  Determination of ortho-cresyl phosphate isomers of tricresyl phosphate used in aircraft turbine engine oils by gas chromatography and mass spectrometry. , 2008, Journal of chromatography. A.

[6]  X. C. Zhou,et al.  Effects of temperature on sliding wear process under contaminated lubricant test conditions , 2004 .

[7]  N. Forster,et al.  Rolling Contact Fatigue Testing of a 3 cSt Polyolester Lubricant with and Without TCP and DODPA/PANA at 177 °C , 2004 .

[8]  N. Forster,et al.  Vapor-Phase Lubrication: Reaction of Phosphate Ester Vapors with Iron and Steel , 2002 .

[9]  P H Craig,et al.  Evaluation of the hazards of industrial exposure to tricresyl phosphate: a review and interpretation of the literature. , 1999, Journal of toxicology and environmental health. Part B, Critical reviews.

[10]  R. Mandaković.  Assessment of ep additives for water‐miscible metalworking fluids , 1999 .

[11]  Ronald L. Shubkin,et al.  Synthetic Lubricants And High- Performance Functional Fluids, Revised And Expanded , 1999 .

[12]  Kenneth W. Van Treuren,et al.  Investigation of vapor-phase lubrication in a gas turbine engine , 1997 .

[13]  B. Çavdar.  Effect of temperature, substrate type, additive and humidity on the boundary lubrication in a linear perfluoropolyalkylether fluid , 1997 .

[14]  Zheng Linqing,et al.  The synergistic effects of tricresyl phosphate oil additive with chemico-thermal treatment of steel surfaces , 1996 .

[15]  Masabumi Masuko,et al.  Boundary lubrication characteristics of polyol ester-class synthetic lubricants applied to silicon nitride at high temperature up to 280°C , 1996 .