Research progress on low friction coefficient solid lubricating coatings

Low friction coefficient solid lubricating coatings have been applied in many fields. The activity in the development of novel solid lubricated coating systems and their deposition methods have been vigorous in tribology research. The self-lubricating principle and research advance of PTFE coatings, MoS₂ coatings and DLC film have been reviewed. New deposition methods of solid lubricating coatings have been introduced. The present problem and the future research direction have also been pointed out.