Comparative studies of the tribological behaviors and tribo-chemical mechanisms for AlMgB14-TiB2 coatings and B4C coatings lubricated with molybdenum dialkyl-dithiocarbamate. (October 2019)

• Record Type: Journal Article
• Authors: Hui, Zhicheng; Li, Zhongjian; Ju, Pengfei; Nie, Yingjian; Ouyang, Jun; Tian, Yun
• Is Part Of: Tribology international. Volume 138(2019)
• Page Start: 47
• Page End: 58
• Publication Date: 2019-10
• Subjects: Boron-rich boride coatings -- MoDTC lubrication -- Tribo-chemical mechanisms -- Sliding tribological properties; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.05.033
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: We compared the tribological behaviors and the tribo-chemical mechanisms of AlMgB14 -TiB2 coatings and B4 C coatings under lubrication with molybdenum dialkyl-dithiocarbamate (MoDTC). In unidirectional sliding contact, the boride coatings exhibited an unstable tribological performance, while the friction coefficients of these coatings maintained a very steady low level in reciprocating sliding contact. No severe wear occurred to the boride coatings. However, significant abrasive wear was observed on the steel balls rubbing against the boride coatings under unidirectional sliding contact. Analysis indicated incomplete dissociation of MoDTC at coating wear tracks and no formation of MoS2 tribofilms on steel counterfaces in the case of unidirectional sliding contact, whereas well-developed MoS2 tribofilms were formed on AlMgB14 -TiB2 coatings under reciprocating sliding condition. Highlights: The tribological behaviors and the tribo-chemical mechanisms of AlMgB14 -TiB2 coatings and B4 C coatings under lubrication with molybdenum dialkyl-dithiocarbamate were compared. In unidirectional sliding contact, the boride coatings exhibited an unstable tribological performance. the friction coefficients of these coatings maintained a steady low level in reciprocating sliding contact. No severe wear occurred to the boride coatings. The tribo-chemical processes for the boride coatings were found to be closely related to the sliding contact configurations and the surface chemical states of the boride coatings.