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

Shiyin HUANG; Yi FENG; Kewang DING; Gang QIAN; Hongjuan LIU; Yang WANG

doi:10.11890/1006-7191-125-391

Acta Metallurgica Sinica (English Letters) >

2012 , Vol. 25 >Issue 5: 391 - 400

DOI: https://doi.org/10.11890/1006-7191-125-391

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

Shiyin HUANG ,
Yi FENG ,
Kewang DING ,
Gang QIAN ,
Hongjuan LIU ,
Yang WANG

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Department of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China

Online published: 2012-10-26

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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

Cite this article

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 . DOI: 10.11890/1006-7191-125-391

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