The formation of reacted film and its influence on tribological properties of extruded Al-Si-Cu-20-25Pb alloy under dry sliding

摘要

The friction and wear characteristics of AlSiCuPb alloys, especially antiseizure, have been investigated under dry sliding for a wide range of load. It is shown that hot extrusion considerably improved antiseizure properties of stircast AlSiCuPb alloys, and a stable wear rate with the lowest level of coefficient of friction are found to be controlled by the formation of a reacted film covering almost the entire worn surfaces of specimens under high applied load. The reacted film consists of compounds containing Al, Si, Pb and O. The reacted film is generally found to play significant role in improving the ability to resist seizure for AlSiCuPb alloys containing 20 wt% and 25 wt% lead. (C) 2003 Kluwer Academic Publishers. [References: 22]