Tribo-investigation on PTFE lubricated PEEK in harsh operating conditions |
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Authors: | Babu Lal Sarfaraz Alam G N Mathur |
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Affiliation: | (1) Polymer Science Division, Defence Materials Research and Development Establishment, P.O. DMSRDE, G. T. Road, Kanpur, 208013, India |
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Abstract: | A series of blends with Polytetrafluroethylene (PTFE) powder and Polyetheretherketone (PEEK) was developed by varying the
PTFE contents in steps of 5 wt.% from 0 to 20 wt.%. The composites were evaluated for their friction and wear properties at
room temperature as well as high temperature in low amplitude oscillating wear (LAOW) mode against steel (100 Cr 6) ball against
polymer plate. The same blends were also evaluated in abrasive wear mode to study the influence of harsh operating conditions
on wear and friction performance. Incorporation of PTFE benefited PEEK in various ways such as it increased the tribo-utility
of the latter by increasing its limiting load value, removing its stick-slip tendency, lowering coefficient of friction and
specific wear rate significantly. With increase in PTFE content, benefits to the wear performance increased regularly. This
was not the case for friction coefficient. Lowest μ was recorded for 15% PTFE contents. The enhancement in wear and friction
performance, however, was at the cost of strength properties which decreased substantially with increase in PTFE content.
At 100 °C, friction coefficient and wear rates of all blends increased marginally. In abrasive wear mode, on the other hand,
PTFE filled PEEK showed poorer wear resistance than neat PEEK. This was correlated with strength properties and it was observed
that these blends closely followed the predictions of Ratner–Lancaster plot. SEM was used to examine the micro-structural
features of worn surfaces. |
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Keywords: | Polyetheretherketone PTFE– PEEK blends friction and wear studies low amplitude oscillating wear (LAOW) abrasive wear |
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