Lubricants based on water-soluble polyacrylamide have also been used in drilling, particularly in low-density drilling fluid systems (Wang 2013).
The main advantage of the use of magnetic fluids as lubricant is based on the considerable reduction of the maintenance for the lubricant supply, because the lubricant is prevented from leaving the contact zone of the tribological system.
Hydrocracking unit in refineries processes vacuum gas oil with the boiling point less than 550 °C, providing the main products such as light naphtha, heavy naphtha, jet fuel, diesel as well as FCC feedstock, ethylene feedstock, or lubricant feedstock based on the served catalysts including naphtha type, flexible type, middle-distillate, and unconverted oil type [12].
This paper deals with three fundamentally different concepts of self-lubricant coatings based on the transition metal dichalcogenides (TMD) and deposited by magnetron sputtering.
The influence of normal load, friction coefficient, volume fraction of solid lubricant and yield strength of solid lubricant are investigated based on the model.
In this study, several bonded solid lubricant coatings, principally based on PTFE or MoS2, were investigated by ball cratering and fretting tests.
The self-lubricating effects of metal matrix self-lubricating composites are based on migrating solid lubricant from matrix to worn surface, which results in the formation of transferred film mainly containing solid lubricant.
Finally, future perspectives for self-lubricant nanocomposite coatings based on the TMD-C concept are presented.
The performance of the lubricants were evaluated based on: (a) maximum punch force measured, (b) the maximum applicable blank holder force (BHF), (c) the draw-in length, (d) the perimeter of flange after test, (e) the change of surface roughness, and (f) the inspection of surface topography.
