The self-lubricating behavior and evolution mechanisms of the surface microporous friction interface of M50-(Sn-Ag-Cu) material

• Main Authors: Xiyao Liu, Zhiwei Lu, Jun’an Zhang, Bo Liu, Yan Cao, Xueming Qian
• Format: Article
• Language: English
• Published: Elsevier 2020-07-01
• Series: Journal of Materials Research and Technology
• Subjects: Self-lubricating behavior; Friction interface; Surface micropore; M50; Sn-Ag-Cu
• Online Access: http://www.sciencedirect.com/science/article/pii/S223878542031365X

The friction interface structure has an important influence on the friction behavior of self-lubricating materials. In this paper, M50 material covered with surface micropores filled with Sn-Ag-Cu (MM-Salloy) was prepared by laser melt deposition. From 25–450 °C, the friction test results show that MM-Salloy exhibits distinguished tribological properties due to the existence of the microporous friction interface. Analysis indicates that Sn-Ag-Cu in surface micropores can dynamically precipitates to the worn surface of MM-Salloy to achieve a lubricating effect, and the increasing of temperature is beneficial to the dynamic precipitation of Sn-Ag-Cu. The whole friction process can be divided into the initial wear stage, fast wear stage and stable wear stage. At stable wear stage, the friction interface is mainly composed of a lubricant-rich surface lubrication layer and a subsurface load-bearing layer, which greatly improves the material's wear resistance. Especially at 350 °C, the surface lubrication layer and subsurface load-bearing layer are most easily formed.