[Show abstract][Hide abstract] ABSTRACT: A four-ball tribological test was used to investigate the effects of a TiF3 catalyst on the tribological behaviors of biofuel soot (BS)-contaminated liquid paraffin (LP). The effects of load and rotational speed were studied as well. Scanning electron microscopy with energy-dispersive spectroscopy and X-ray photoelectron spectroscopy were conducted to investigate surface element content and chemical valence state, respectively. Results showed that the extreme pressure properties of BS-contaminated LP were all promoted with or without the presence of 0.5 wt% TiF3. The TiF3 catalyst material significantly contributed to the antiwear and the antifriction properties of LP with or without BS contamination. These results were caused by the decomposition of the TiF3 catalyst into TiO2 and fluoride (FeF2) which improved the lubricity.
Tribology International 09/2014; 77:122–131. · 2.17 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Export Date: 3 October 2013, Source: Scopus, CODEN: WEARA, doi: 10.1016/j.wear.2013.06.003, Language of Original Document: English, Correspondence Address: Hu, X.; Institute of Tribology, Hefei University of Technology, Hefei 230009, China; email: email@example.com, Funding Details: 51275143, NSFC, National Natural Science Foundation of China, References: Calabria, R., Chiariello, F., Massoli, P., Combustion fundamentals of pyrolysis oil based fuels (2007) Experimental Thermal and Fluid Science, 31, pp. 413-420;
[Show abstract][Hide abstract] ABSTRACT: Biomass-oil soot (BS) particles were characterized by a range of analytical techniques. A comparative analysis with commercial carbon black (CB), a surrogate for diesel soot particles, was carried out. The experimental results showed that the morphologies of BS and CB particles were both spherical, with average diameters of 50 and 40 nm, respectively. There were only a few differences between the elemental composition of BS and CB. The groups (CO, OCO and COC) were presented on the surfaces of CB and BS. Moreover, it was also found that COH group was appeared on the surface of BS. BS contained more acidic and basic sites than CB, which was ascribed to the complex mixtures of biomass oil. Both BS and CB had virtually indistinguishable perturbed graphitic or turbostratic internal structures. Thus, CB can be a potential alternative to evaluate the aggregation and tribological behavior of BS in lubricating oils.