Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions

Macroscale rolling/sliding conditions are in the superlubricity, a little-studied topic so far. The purpose of this paper is to examine the formation of elastohydrodynamic lubrication (EHL) films by water-based lubricants (glycerol and polyethylene glycol (PEG)), providing superlubricous friction. E...

Full description

Saved in:
Bibliographic Details
Published in:Friction 2024-01, Vol.12 (1), p.164-173
Main Authors: Poláček, Tomáš, Šperka, Petr, Křupka, Ivan
Format: Article
Language:English
Subjects:
Aqueous solutions
Corrosion and Coatings
Elastohydrodynamic lubrication
elastohydrodynamic lubrication (EHL)
Engineering
Falling bodies
Film thickness
Hydroxyl groups
Liquids
Lubricants
Lubricants & lubrication
macroscale superlubricity
Mechanical Engineering
Nanotechnology
Physical Chemistry
Polyethylene glycol
Research Article
Shear thinning (liquids)
Sliding
super low traction
Surfaces and Interfaces
Thickness measurement
Thin Films
Tribology
Viscometers
water-based lubricants
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Macroscale rolling/sliding conditions are in the superlubricity, a little-studied topic so far. The purpose of this paper is to examine the formation of elastohydrodynamic lubrication (EHL) films by water-based lubricants (glycerol and polyethylene glycol (PEG)), providing superlubricous friction. Experiments were carried out on an optical ball-on-disc tribometer under rolling/sliding conditions. The film thickness was measured by the thin film colorimetric interferometry, and the viscosity of liquids was measured by rotational and high-pressure falling body viscometers. The results show that tribochemical reactions are not the mandatory reason for friction to reach the superlubricity level when using the water-based lubricants. The studied liquids themselves are almost Newtonian. With the addition of water, the signs of shear thinning behavior disappear even more. Suitable conditions for this type of lubricant can be predicted using the known Hamrock–Dowson equations. An anomaly in the thickness of the lubricants was observed as an abrupt change at certain conditions. The more PEG there is in the lubricant, the higher the thickness at the beginning of the jump.
ISSN:2223-7690
2223-7704
DOI:10.1007/s40544-023-0762-6