Friction and wear properties of Cu-based self-lubricating composites in air and vacuum conditions

doi:10.11890/1006-7191-125-391

Abstract

Abstract:

Cu-based self-lubricating materials containing two different solid lubricants (graphite and MoS2) were fabricated by P/M hot pressing techniques. Physical and mechanical properties of the samples were examined. The effects of graphite and MoS2 contents on friction coefficient and wear rate were investigated by a ring-on-disc wear machine in air and vacuum conditions, respectively. Tribo-films formed on the worn surfaces were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicated that density, hardness and bending strength all increased with the increasing content of MoS2, while the relative density was opposite. Sample B containing 15 vol. pct graphite and 15 vol. pct MoS2 possessed superior tribological properties both in air and vacuum conditions. However, the tribo-films formed on the worn surfaces of the sample B were greatly discrepant in composition at different testing conditions. In air, the volume ratio of MoS2 and graphite in the tribo-films is 0.31:1 whereas the ratio in vacuum is 1.07:1.

Key words: Self-lubricating composite, Air and vacuum conditions, Friction coefficient, Wear rate, Synergistic effect

Shiyin HUANG, Yi FENG,Kewang DING, Gang QIAN, Hongjuan LIU,Yang WANG. Friction and wear properties of Cu-based self-lubricating composites in air and vacuum conditions[J]. Acta Metallurgica Sinica (English Letters), 2012, 25(5): 391-400.

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