Tribological properties of lubricating oil with micro/nano-scale WS₂ particles

Abstract

The tribological properties of lubricating oil containing micro/nanoscale WS 2 (90 nm, 2 mm) and ionic liquid [C 7 H 11 F 3 N 2 O 3 S] are evaluated using a four-ball friction tester. Results show that the addition of micro/nano-scale WS 2 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 WS 2 and base oil and promote the dispersion of WS 2 in the sample oil. The base oil with 90 nm nano-WS 2 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-WS 2 as lubricating additive are uniform and symmetrical and can homogenously appear on the friction area. This work proves that the micro/nano-scale WS 2 plays an important role in improving the performance of tribological properties of lubricating oil.

Preparation and Tribological Properties of Carbon-Coated WS2 Nanosheets

“…Sade et al [8] demonstrated that nano-WS 2 modified by Span80 could noticeably reduce the friction coefficient, as well as the depth and width of wear scars, using a ball-on-disc test. Wu et al [9] compared the friction properties of micro- and nano-flake WS 2 as lubricant additives. Their results showed that the lubricating performance of WS 2 with a diameter of 90 nm was slightly better than that of WS 2 with a diameter of 2 μm, but the difference in friction coefficient was only about 5%.…”

Application of Silica–Coated Magnetite on a Steel Plate and its Frictional and Thermal Effect

“…The results show that the ferro-lubricant used silica-coated magnetite particle as the additive on the plate reduces the friction in both static and dynamic conditions. Previous research conducted by Wu et al suggested a similar behavior where the additive of particles in lubricant could reduce the friction coefficient [49]. However, the friction and wear resistance on a surface that used ferro-lubricant as the lubrication media depend on the particle size and concentration (volume fraction) used as its additive [50,51].…”

Synthesis of Tribological WS2 Powder from WO3 Prepared by Ultrasonic Spray Pyrolysis (USP)

“…Particles of the synthesized WS 2 powders ranged from submicrometers to micrometers in size. The mixture of these two powders should provide better friction and wear performance between contacting surfaces, according to N. Wu et al [24].…”