Friction and wear properties of metal powder filled PTFE composites under oil lubricated conditions

Four kinds of polytetrafluoroethylene (PTFE)-based composite, pure PTFE, PTFE+30vol.%Cu, PTFE+30vol.%Pb and PTFE+30vol.%Ni composite, were prepared. The friction and wear properties of these metal powder filled PTFE composites sliding against GCr15 bearing steel under both dry and lubricated conditi...

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Bibliographic Details
Published in:Wear 1997-09, Vol.210 (1), p.151-156
Main Authors: Zhang, Zhao-Zhu, Xue, Qun-Ji, Liu, Wei-Min, Shen, Wei-Chang
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Friction and wear
Friction, wear, lubrication
Frictional surfaces
Machine components
Mechanical engineering. Machine design
Mechanical properties
Metal fillers
Oil lubrication
Physical properties
Polymer industry, paints, wood
Properties and testing
PTFE composites
Technology of polymers
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Summary:Four kinds of polytetrafluoroethylene (PTFE)-based composite, pure PTFE, PTFE+30vol.%Cu, PTFE+30vol.%Pb and PTFE+30vol.%Ni composite, were prepared. The friction and wear properties of these metal powder filled PTFE composites sliding against GCr15 bearing steel under both dry and lubricated conditions were studied using an MHK-500 ring-block wear tester. The worn surfaces of the PTFE composites and the transfer films formed on the surface of GCr15 bearing steel were examined using scanning electron microscopy (SEM) and optical microscopy respectively. Experimental results show that the friction and wear properties of the PTFE composites can be greatly improved by liquid paraffin lubrication. The wear of these PTFE composites can be decreased by at least 1 to 2 orders of magnitude compared with that under dry friction conditions, while the friction coefficients can be decreased by 1 order of magnitude, SEM and optical microscopy investigations of the rubbing surfaces show that metal fillers of Cu, Pb and Ni not only raise the load carrying capacity of the PTFE composites, but also promote transfer of the PTFE composites onto the counterfaces, so they greatly reduce the wear of the PTFE composites. However, the transfer of these PTFE composites onto the counterfaces can be greatly reduced by liquid paraffin lubrication, but transfer still takes place.
ISSN:0043-1648
1873-2577
DOI:10.1016/S0043-1648(97)00052-5