Abstract
ABSTRACTThe tribological properties of lubricating oil containing micro/nano-scale WS2 (90 nm, 2 µm) and ionic liquid [C7H11F3N2O3S] are evaluated using a four-ball friction tester. Results show that the addition of micro/nano-scale WS2 can improve the tribological properties of the base oil; moreover, adding the ionic liquid as a solvent may lead to a better mixing of the micro/nano-scale WS2 and base oil and promote the dispersion of WS2 in the sample oil. The base oil with 90 nm nano-WS2 and ionic liquid presents the best anti-friction and anti-wear properties at 1 wt.% content. The surface analysis of wear scars reveals that ploughing is the main cause of wear in the three bottom balls. Furthermore, the wear furrows of nano-WS2 as lubricating additive are uniform and symmetrical and can homogenously appear on the friction area. This work proves that the micro/nano-scale WS2 plays an important role in improving the performance of tribological properties of lubricating oil.
Highlights
Nanotechnology is considered to be the most revolutionary and respected technology in the twenty-first century; it has a profound impact on other disciplines, industries and the society [1]
Micro/nano-scale WS2 is a new type of lubrication and wear-reduction material and has excellent lubricating performance; it is one of the best materials for friction and lubrication recognised by the scientific community
As a lubricating oil additive, the micro/nano-scale WS2 was selected as the research object to test its friction-reduction and anti-wear effects, and the function of ionic liquid as a solvent was discussed
Summary
Nanotechnology is considered to be the most revolutionary and respected technology in the twenty-first century; it has a profound impact on other disciplines, industries and the society [1]. Micro/nano-scale WS2 is a new type of lubrication and wear-reduction material and has excellent lubricating performance; it is one of the best materials for friction and lubrication recognised by the scientific community. Ionic liquids are non-flammable and non-explosive, and have a low melting point, low volatility and high thermal stability. These properties are consistent with the desired performance of an ideal lubricant. The ionic liquid is considered to be a promising new lubricant In this experiment, as a lubricating oil additive, the micro/nano-scale WS2 was selected as the research object to test its friction-reduction and anti-wear effects, and the function of ionic liquid as a solvent was discussed. Based on the experimental data, the correlation among these variables was analysed, and the influence of these variables on the tribological properties of lubricating oil was studied
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