Abstract
Tribological properties of lithium potassium titanate (PT), molybdenum disulphide, and tungsten disulphide-dispersed mineral oil (MO) were investigated. The sample containing 2 wt.% WS2 exhibited the lowest coefficient of friction. However, the wear scar diameters of the additivated samples were very narrow. Extreme pressure properties of mineral oil were enhanced with the addition of additives. The rolling contact fatigue results exhibited better fatigue life of the balls in MoS2 and PT-dispersed MO. Surface characterization of the balls indicated more pitting on the balls of the MO and WS2-dispersed MO as compared to MoS2 and PT, indicating a stable film in the case of MoS2 and PT, which was confirmed by the presence of additives on ball surfaces by Raman spectrograph. The results of extended rolling contact fatigue tests proved that PT-added mineral oil provided the highest life cycles of the tested balls, followed by MoS2 and WS2-added mineral oil; thus, indicating PT as a plausible alternative to MoS2 and WS2.
Highlights
Lubrication is an important practice in any process industry and selecting the right lubricant with proper additives is an important task for any maintenance engineer
With the demand for high-performance lubricants with enhanced tribological properties, the tribological properties of tungsten disulphide (WS2 ) [4,5] and molybdenum disulphide (MoS2 ) were investigated [6], which have been considered as efficient emergency extreme pressure solid lubricants in industries
The present work investigated the tribological properties of tungsten disulphide, molybdenum disulphide and lithium potassium titanate-added mineral oil using a fourball tribometer
Summary
Lubrication is an important practice in any process industry and selecting the right lubricant with proper additives is an important task for any maintenance engineer. Mineral oils derived from fossils are the most widely used lubricants in industries, till date. Various researchers have studied the tribological properties of these mineral oils as lubricants and have recommended the usage of several additives to enhance their performances [1,2]. With the demand for high-performance lubricants with enhanced tribological properties, the tribological properties of tungsten disulphide (WS2 ) [4,5] and molybdenum disulphide (MoS2 ) were investigated [6], which have been considered as efficient emergency extreme pressure solid lubricants in industries. Charoo et al [8] dispersed MoS2 of 3 μm, 5 μm, 7 μm, and nm in SAE 20W40 and evaluated the tribological properties of the lubricant between
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