Research progresses of nanomaterials as lubricant additives

Abstract

Friction and wear are unavoidable in mechanical movement. The use of lubricants with nano-additives can effectively reduce friction and wear, which is of great significance to saving energy and protecting the environment. At present, great progress has been made in the scientific research and industrial application of nano-additives for lubricants. This paper mainly introduces the types of nano-additives for lubricants (such as carbon nanomaterials, nano-metals, nano-oxides, sulfides, complexes, polymers, etc.), the tribological properties of lubricants with different components of nano-additives, and the lubrication mechanisms of the nano-additives (including tribofilm formation, rolling ball bearing effect, repairing effect, polishing effect, and synergistic effect). It also deals with the dispersion of nano-additives in lubricants and the influences of their particle size and microstructure on the tribological properties of lubricants. This review outlines the performance requirements of nano-additives in different lubrication states, discusses the use of nano-additives in challenging working conditions, and identifies various industrial oil nano-additives with reference to the appropriate options in diverse working environments. Furthermore, the existing problems of nano-additives and their application prospects are summarized. This review, hopefully, would help to shed light on the design and synthesis of novel high-performance nano-additives and promote their application in engineering.

Preparation of Polyoxymethylene/Exfoliated Molybdenum Disulfide Nanocomposite through Solid-State Shear Milling

“…The oppositely inlaid twin mill-pans of the above-mentioned pan-milling equipment can act as three-dimensional scissors during panmilling, which could exert very strong compression, shear, and hoop stretching stresses for pulverization, dispersion, mixing, and mechanochemical activation on the milled materials. In our team's previous work, the S 3 M strategy was able to efficiently cut the multi-wall carbon nanotubes and induce strong interfacial interactions with the polyamide 6 matrix [21]. This technology proved to effectively solve the compatibility problem and control the phase morphology of the nano-fillers in the polymer matrix.…”

“…The two-dimensional molybdenum disulfide (MoS 2 ) has attracted extensive attention due to its excellent tribological performance and potential electrical and optical performance [1]. The weak layered structure of MoS 2 gives it its perfect lubrication property [2], which makes the MoS 2 particles widely used as additives in lubricating oils, greases, and solid materials [3]. However, the morphology of the MoS 2 particle has a great influence on its ultimate tribological performance.…”