A review of solid lubrication based on polyurethane composites

Abstract

Solid lubricant materials could be used in various extreme conditions owing to the excellent anti‐friction and ‐wear with the low friction coefficient and wear rate. Polyurethane (PU)‐based solid lubricants as one of the widely utilized composite materials had been well‐known by researchers all over the world. PU‐based composite lubricants were commonly segmented into single‐phase lubricants and multi‐phase lubricants via inorganic or organic lubricant additives. What is more, the modified PU by solid lubricants would endow higher tribological performances than that of single‐phase PU‐based lubricants. Based on the multi‐component synergy, the multi‐phase lubricants could significantly improve the PU matrix's lubrication and wear resistance and enhance the comprehensive performance such as corrosion resistance. This paper mainly discussed and summarized the recent development in tribological performances of PU‐based composite lubricants, and explored their prospective research directions.

Size-Regulated Metal–Organic Frameworks with Mercaptobenzothiazole for Ga-Based Liquid Metal Encapsulation: A High Performance Oil-Based Additive

“…As the friction process progresses, the relative motion between the friction pairs generates shear stress, causing the GLM-TA@ MZ-2 dispersed within the lubricating oil to roll and crack. 59 This action initiates a series of complex tribochemical reactions. As a result, the adsorption layer undergoes changes, leading to the formation of a robust frictional protective film consisting of GLM-TA@MZ-2 and iron oxides.…”

“… , This adsorption forms a protective layer that effectively separates the contacting friction pairs, which is crucial for achieving optimal lubrication. As the friction process progresses, the relative motion between the friction pairs generates shear stress, causing the GLM-TA@MZ-2 dispersed within the lubricating oil to roll and crack . This action initiates a series of complex tribochemical reactions.…”